c++ "error C4716: 'F_Ite' : must return a value"

Question

sdmahapatra 9 Light Poster

14 Years Ago

double F_Ite()
 {                      //Main Function Start   
	 //Locally Data_type Declaration And Initialization :
  int numElement =20;
  double *a,*b,*c,*d,*Fc,*Fd;
  a = new double[numElement];
  b = new double[numElement];
  c = new double[numElement];
  d = new double[numElement];
  Fc= new double[numElement];
  Fd= new double[numElement];
	 
  
  for(int k=1;k<(NI-1);k++)
	{						//Main 'for' Loop Start
		std::cout <<"\n";
		system("pause");
		std::cout <<"\n";
		std::cout <<"At The "<<k+1<<" Iteration :\n";
		
	  if(Fc[k]<Fd[k])
	  {                     //Outer 'if' Start
	    a[k+1]=a[k];
		std::cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
		b[k+1]=d[k];
		std::cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
		//c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
		//cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		if(k==(NI-1))
		{
		  c[k+1]=c[k+1]+z;
		  std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		}
		else
		{
		c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
		std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		}
		d[k+1]=c[k];
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";

		Fc[k+1]=(exp(-c[k+1]))+(c[k+1]*c[k+1]);
		std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
		//std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k] << "\n";

		Fd[k+1]=Fc[k];
		//std::cout <<"The Value Of Fd" << k+1 << "=" << Fc[k] << "\n";
		std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";
				

	  }						//Outer 'if' Close
	   else
	  {                     //Outer 'else' Start
	    a[k+1]=c[k];
		std::cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
		b[k+1]=b[k];
		std::cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
		c[k+1]=d[k];
		std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		//d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
		//std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
		
		if(k==(NI-1))
	  {
	    d[k+1]=d[k+1]+z;
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
	  }

		else
		{
		d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
		}

	  	  
	    Fc[k+1]=Fd[k];
	    //std::cout <<"The Value Of Fc" << k+1 << "=" << Fd[k] << "\n";
		std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
	    Fd[k+1]=(exp(-d[k+1]))+(d[k+1]*d[k+1]);
	    std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";
		//std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k] << "\n";

	  }						//Outer 'else' Close
	 }					//Main 'for' Loop Close

	  //Another 'if' Condition Start But Within The 'for' Loop
  	  if(Fc[10]<Fd[10])
	{
		std::cout <<"\n";
	  std::cout <<"\nAt Final Iteration :\n";
	  a[NI]=a[NI-1];
	  b[NI]=d[NI-1];
	  std::cout <<"The Value Of a11 =" << a[NI] << "\n";
	  std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}
	else
	{
	  a[NI]=c[NI-1];
	  b[NI]=b[NI-1];
	  std::cout <<"The Value Of a11 =" << a[NI] << "\n";
	  std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}

}					//Main Function Close

Hi all,I am a new coder in c++ & have found "error C4716: 'F_Ite' : must return a value".I want to return all the value of a,b,c,Fc,Fd to the main function.But in general return can only return one value.please help me to fulfill this coding.
Thanks

c++

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Latest Post 14 Years Ago Latest Post by sdmahapatra

All 9 Replies

ArkM 1,090 Postaholic

14 Years Ago

1. About C4716: didn't you know that double F_Ite() function must return double type value? And where is return anything-of-double_type in the function body? It's your code, you have wrote double F_Ite() ...
2. Use code tag with the language specifier (see this forum announcements):
[code=cplusplus] source

[/code]
It's impossible to cope with this unformatted nightmare!
3. There are two common ways to "return" several values:
3.1 Declare several function parameters (pointers or references to targets).
3.2 Declare a proper struct or class compound type then fill the object of this type and return it as a function value.

mvmalderen commented: The actual thread solver :) +9

Sky Diploma 571 Practically a Posting Shark

14 Years Ago

Why dont you use an array of pointers and return the array of pointers.

JasonHippy 739 Practically a Master Poster

14 Years Ago

As the other guys have suggested, there are several ways around the problem.
The error you're getting is because your F_Ite() function does not return a value.

A function can only return one value, the only way of returning several values would be to either create all of the variables you want returned outside of your function and pass them into your function as pointers or references, or pass them as an array of pointers.
You could then change the return type of the function to void as the function will manipulate the contents of the pointers, so it won't need to return anything.

Or you could get your function to return an array of pointers.

I'm not sure how au-fait you are with the idea of pointers and arrays, so for now I'll go with the idea of creating the values outside of the function and passing them individually as pointers.
Here's what the code would look like:

#include<iostream>
#include<cmath>

// pass values into your function
void F_Ite(double *a, double *b, double *c, double *d, double *Fc, double *Fd)
{ //Main Function Start
	// you could initialise your variables here, or outside of the function.
	// I've gone for the latter, but whatever floats your boat!

	for(int k=1;k<(NI-1);k++)
	{ //Main 'for' Loop Start
		std::cout <<"\n";
		system("pause");
		std::cout <<"\n";
		std::cout <<"At The "<<k+1<<" Iteration :\n";

		if(Fc[k]<Fd[k])
		{ //Outer 'if' Start
			a[k+1]=a[k];
			std::cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
			b[k+1]=d[k];
			std::cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
			//c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
			//cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
			if(k==(NI-1))
			{
				c[k+1]=c[k+1]+z;
				std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
			}
			else
			{
				c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
				std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
			}
			d[k+1]=c[k];
			std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";

			Fc[k+1]=(exp(-c[k+1]))+(c[k+1]*c[k+1]);
			std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
			//std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k] << "\n";

			Fd[k+1]=Fc[k];
			//std::cout <<"The Value Of Fd" << k+1 << "=" << Fc[k] << "\n";
			std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";


		} //Outer 'if' Close
		else
		{ //Outer 'else' Start
			a[k+1]=c[k];
			std::cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
			b[k+1]=b[k];
			std::cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
			c[k+1]=d[k];
			std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
			//d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
			//std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";

			if(k==(NI-1))
			{
				d[k+1]=d[k+1]+z;
				std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
			}
			else
			{
				d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
				std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
			}


			Fc[k+1]=Fd[k];
			//std::cout <<"The Value Of Fc" << k+1 << "=" << Fd[k] << "\n";
			std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
			Fd[k+1]=(exp(-d[k+1]))+(d[k+1]*d[k+1]);
			std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";
			//std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k] << "\n";

		} //Outer 'else' Close
	} //Main 'for' Loop Close

	//Another 'if' Condition Start But Within The 'for' Loop
	if(Fc[10]<Fd[10])
	{
		std::cout <<"\n";
		std::cout <<"\nAt Final Iteration :\n";
		a[NI]=a[NI-1];
		b[NI]=d[NI-1];
		std::cout <<"The Value Of a11 =" << a[NI] << "\n";
		std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}
	else
	{
		a[NI]=c[NI-1];
		b[NI]=b[NI-1];
		std::cout <<"The Value Of a11 =" << a[NI] << "\n";
		std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}

} //Main Function Close


int main()
{
	// declare your pointers outside of your function and pass them as parameters to F_Ite
	double *a,*b,*c,*d,*Fc,*Fd;

	// you could optionally initialise them before passing them to your function
	int numElement =20;

	a = new double[numElement];
	b = new double[numElement];
	c = new double[numElement];
	d = new double[numElement];
	Fc= new double[numElement];
	Fd= new double[numElement];
	
	// now call the function
	F_Ite(a,b,c,d,Fc,Fd);

	// Now you can cout your values, or do whatever with them
	// don't forget to delete them when you're done.
	// wherever you create something with 'new' you should
	// always call 'delete' when finished!

	return 0;
}

NOTE: The bulk of the above is your code, just rejigged a little.
DISCLAIMER: I haven't compiled or tested this, but it should be more or less correct!

Cheers for now,
Jas.

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sdmahapatra 9 Light Poster · Answer 1 · 2009-06-16T15:03:59+00:00

#include<iostream>
#include<cmath>
#include<algorithm>


void showdata(void);
double R_Fibo();
double F_Ite();
//double F_Ite(double,double,double,double,double,double);
// never ever declare global data in C++

 //Globally Data_type Declaration & Initialization :
 double z=0.0001;
 double NR=0.01;
 int NI=11;
 double RF;

  int main(int argc, char* argv[]) 
{
  std::cout <<"\nThe Function is ' F(x)=e^(-x)+x^2 '";
  std::cout <<"\n";
  
  int numElement =20;
  double *a,*b,*c,*d,*Fc,*Fd,I;
  a = new double[numElement];
  b = new double[numElement];
  c = new double[numElement];
  d = new double[numElement];
  Fc= new double[numElement];
  Fd= new double[numElement];
  
  //User Specify The Interval :
  std::cout << "\nGive The Initian Point :" <<"\na1 =";
  std::cin >> a[1];
  std::cout << "\nGive The Final Point :" <<"\nb1 =";
  std::cin >> b[1];
 
  //Find Distance Between The Starting Interval :
  I=(b[1]-a[1]);
  std::cout << "\nInterval Reduction At The Initial Iteration :"<< "\nI(1) = " << I <<"\n";


  
  //Here The Beginnins Of Iteration Technique 
  //We Introduce Two Another Points For Getting Two New Interval Of Uncertainty
  //First Point 'c1' And Second Point 'd1' :
  c[1]=b[1]-(R_Fibo()*I);
  std::cout << "\nPlaced A Point c1 Within The Initial Interval :"<< c[1];
  d[1]=a[1]+(R_Fibo()*I);
  std::cout <<"\nPlaced Another Point d1 Within The Initial Interval :"<<d[1];
  std::cout <<"\n";
  std::cout <<"\n";
  
  //Showing The Starting Reduction :
  //----------------
  //----------------
  std::cout <<"At The First Iteration :\n";
  std::cout <<"The Value Of a1=" << a[1] << "\n";
  std::cout <<"The Value Of b1=" << b[1] << "\n";
  std::cout <<"The Value Of c1=" << c[1] << "\n";
  std::cout <<"The Value Of d1=" << d[1] ;
  //--------------------
 
  //Function 'Fc1' at point 'c1' And Function 'Fd1' at point 'd1':
// write a function which takes one argument and returns the value. use it here instead of explicit coding.
  Fc[1]=(exp(-c[1]))+(c[1]*c[1]);
  std::cout << "\nAt c1 The Function Value Fc1=" << Fc[1];
  //std::cout <<"\n";
  Fd[1]=(exp(-d[1]))+(d[1]*d[1]);
  std::cout << "\nAt d1 The Function Value Fd1=" << Fd[1];
  std::cout <<"\n";
  std::cout <<"\n";
  //---------------------
  //---------------------

  double In=b[NI]-a[NI];
  std::cout <<"\nThe Interval Reduction At The Final Iteration :" <<"\nI(n)= " << In;
  std::cout<<"\n";

  std::cout << std::endl;
  system("pause");
 //return 0;
}

void showdata(void)
{
  //For Accuracy Exactness Need A Small Pertubation At The Final Interval
  std::cout <<"\nFor Accuracy At The Final Interval, Taken The Small Perturbation z :";
  std::cout <<"\nTaken z = 0.0001" << "\n";
  
  //Give The Prescribe Interval Reduction :
  std::cout <<"\nNeeded The Prescribe Interval Reduction :" <<"\nNR = 0.01 units";
  std::cout <<"\n";
  
  //Calculate The Number Of Iteration From The Given Interval Reduction :
  //By Fibonacci Series
  std::cout <<"\nAccording To The Interval Reduction";
  std::cout <<"\nThe Requring Number Of Iteration :" << "\nNI = 11 times";
  std::cout <<"\n";
  std::cout <<"\n";

  std::cout <<"\nBefore The Start Of Interval Reduction";
  std::cout << "\nThe Ratio of two consecutive Fibo_Num :"<<"\nRF = 0.618056";
  std::cout <<"\n";
   
}

    double R_Fibo()
  {
  //Ratio of two successive terms of Fibonacci Sequence is obtained using Binet's Formula
  //Function (F(m-1)/Fm) Defination :

  double n1=1-(sqrt((double)5));
  double n2=1+(sqrt((double)5));
  double s=(n1/n2);
  //cout << "\nsThe Value Of s = " << s <<"\n";

  double s1=(sqrt((double)5)-1)/2;
  //cout << "\nThe Value Of s1 = " << s1 <<"\n";

  double RF=s1*((1-pow(s,NI))/(1-pow(s,(NI+1))));
  
  //std::cout << "\nThe Ratio of two consecutive Fibo_Num :"<<"\nRF = " << RF <<"\n"; 
  //std::cout << RF; 

  return RF;

 } 
  


 double F_Ite()
 {                      //F_Ite Function Start   
	 //Locally Data_type Declaration And Initialization :
  int numElement =20;
  double *a,*b,*c,*d,*Fc,*Fd;
  a = new double[numElement];
  b = new double[numElement];
  c = new double[numElement];
  d = new double[numElement];
  Fc= new double[numElement];
  Fd= new double[numElement];
	 
  
  for(int k=1;k<(NI-1);k++)
	{						//Main 'for' Loop under F_Ite() Start
		std::cout <<"\n";
		system("pause");
		std::cout <<"\n";
		std::cout <<"At The "<<k+1<<" Iteration :\n";
		
	  if(Fc[k]<Fd[k])
	  {                     //Outer 'if' Start
	    a[k+1]=a[k];
		std::cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
		b[k+1]=d[k];
		std::cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
		//c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
		//cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		if(k==(NI-1))
		{
		  c[k+1]=c[k+1]+z;
		  std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		}
		else
		{
		c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
		std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		}
		d[k+1]=c[k];
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";

		Fc[k+1]=(exp(-c[k+1]))+(c[k+1]*c[k+1]);
		std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
		//std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k] << "\n";

		Fd[k+1]=Fc[k];
		//std::cout <<"The Value Of Fd" << k+1 << "=" << Fc[k] << "\n";
		std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";
				

	  }						//Outer 'if' Close
	   else
	  {                     //Outer 'else' Start
	    a[k+1]=c[k];
		std::cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
		b[k+1]=b[k];
		std::cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
		c[k+1]=d[k];
		std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		//d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
		//std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
		
		if(k==(NI-1))
	  {
	    d[k+1]=d[k+1]+z;
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
	  }

		else
		{
		d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
		}

	  	  
	    Fc[k+1]=Fd[k];
	    //std::cout <<"The Value Of Fc" << k+1 << "=" << Fd[k] << "\n";
		std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
	    Fd[k+1]=(exp(-d[k+1]))+(d[k+1]*d[k+1]);
	    std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";
		//std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k] << "\n";

	  }						//Outer 'else' Close
	 }					//Main 'for' Loop Close

	  //Another 'if' Condition Start But Within The 'for' Loop
  	  if(Fc[10]<Fd[10])
	{
		std::cout <<"\n";
	  std::cout <<"\nAt Final Iteration :\n";
	  a[NI]=a[NI-1];
	  b[NI]=d[NI-1];
	  std::cout <<"The Value Of a11 =" << a[NI] << "\n";
	  std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}
	else
	{
	  a[NI]=c[NI-1];
	  b[NI]=b[NI-1];
	  std::cout <<"The Value Of a11 =" << a[NI] << "\n";
	  std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}

}					//F_Ite Function Close

this is my total program.so how to return several values.

sdmahapatra 9 Light Poster · Answer 2 · 2009-06-16T15:08:18+00:00

Why dont you use an array of pointers and return the array of pointers.

Will u pls help me how to do this?

sdmahapatra 9 Light Poster · Answer 3 · 2009-06-16T15:15:26+00:00

1. About C4716: didn't you know that double F_Ite() function must return double type value? And where is return anything-of-double_type in the function body? It's your code, you have wrote double F_Ite() ...
2. Use code tag with the language specifier (see this forum announcements):
[code=cplusplus] source

[/code]
It's impossible to cope with this unformatted nightmare!
3. There are two common ways to "return" several values:
3.1 Declare several function parameters (pointers or references to targets).
3.2 Declare a proper struct or class compound type then fill the object of this type and return it as a function value.

Declare several function parameters (pointers or references to targets). I have tried this but unable to get success.I have post my total code just pls check it out & pls suggest me some useful concept.

Sky Diploma 571 Practically a Posting Shark · Answer 4 · 2009-06-16T15:29:38+00:00

Firstly Please USE Code tags, as it is very hard to understand the post that you have posted.

I personally feel that for you the best way to return your doubles is with a struct.

for example

struct Values{ //Creates a new datatype named values
double* a, *b;//SO on.
}

Values func1()// function named func1 returning type Values
{
   double *s, *z; 
   /*Do something with s and z*/
   Values a1;// Now we made a variable named a1 of type value
    a1.a=&s; //We know that Values have a member a;
    a1.b=&z; //And also b, We now make them point to the local doubles
return a1; //Return type of values
}

int main()
Values f1=func1();
}

then now f1.a and f1.b will point to the doubles.
THough remember that pointers to local variables is undefined and only the variables initialised with new are returned back.

DO not forget to use the delete [] later.

JasonHippy 739 Practically a Master Poster · Answer 5 · 2009-06-16T15:45:00+00:00

I personally feel that for you the best way to return your doubles is with a struct.

I second that motion!
That would be preferable to the method I put forward.

I just wasn't sure how familiar the OP was with structs, pointers and arrays. So I went with the simplest example passing each value separately....

Although looking my post now, why I posted the entire body of the function instead of just posting a more compact example is beyond me! heh heh ;)

Good solution Sky!

sdmahapatra 9 Light Poster · Answer 6 · 2009-06-20T14:41:30+00:00

hi friends,right now I am facing this type of problem.Will anyone please help me out.please as I am New inC++ & after tried not getting.

Thanks

#include<iostream>
#include<cmath>
#include<algorithm>

using namespace std; // you should not use this statement.
void F_Ite(double,double,double,double,double,double);
// never ever declare global data in C++

 //Globally Data_type Declaration & Initialization :
 double z=0.0001;
 double NR=0.01;
 int NI=11;
 double RF;

  int main(int argc, char* argv[]) // put the othe arguments for main (int argc, char* argv[]) 
{
//Result Of A Fibonacci_Search Algorithm Operation On A Given Function :
  std::cout <<"\nThe Function is ' F(x)=e^(-x)+x^2 '";
  std::cout <<"\n";
  
// declare your pointers outside of your function and pass them as parameters to F_Ite
	double *a,*b,*c,*d,*Fc,*Fd,I;

	// you could optionally initialise them before passing them to your function
	int numElement =20;

	a = new double[numElement];
	b = new double[numElement];
	c = new double[numElement];
	d = new double[numElement];
	Fc= new double[numElement];
	Fd= new double[numElement];
	
	// now call the function
	F_Ite(a,b,c,d,Fc,Fd);

	// Now you can cout your values, or do whatever with them
	// don't forget to delete them when you're done.
	// wherever you create something with 'new' you should
	// always call 'delete' when finished!
  
  //User Specify The Interval :
  std::cout << "\nGive The Initian Point :" <<"\na1 =";
  std::cin >> a[1];
  std::cout << "\nGive The Final Point :" <<"\nb1 =";
  std::cin >> b[1];
  
  
  //Find Distance Between The Starting Interval :
  I=(b[1]-a[1]);
  std::cout << "\nInterval Reduction At The Initial Iteration :"<< "\nI(1) = " << I <<"\n";


  //For Accuracy Exactness Need A Small Pertubation At The Final Interval
  std::cout <<"\nFor Accuracy At The Final Interval, Taken The Small Perturbation z :";
  std::cout <<"\nTaken z = 0.0001" << "\n";
  
  //Give The Prescribe Interval Reduction :
  std::cout <<"\nNeeded The Prescribe Interval Reduction :" <<"\nNR = 0.01 units";
  std::cout <<"\n";
  
  //Calculate The Number Of Iteration From The Given Interval Reduction :
  //By Fibonacci Series
  std::cout <<"\nAccording To The Interval Reduction";
  std::cout <<"\nThe Requring Number Of Iteration :" << "\nNI = 11 times";
  std::cout <<"\n";
  std::cout <<"\n";


  system("pause");  // this is a platform specific call. do not use this.
  


  //To Calculate The Ratio of two consecutive Fibo_Num (F(m-1)/Fm) :
  //Function (F(m-1)/Fm) Declaration :
  double R_Fibo();
  std::cout <<"\nBefore The Start Of Interval Reduction";
  std::cout << "\nThe Ratio of two consecutive Fibo_Num :"<<"\nRF = 0.618056";
  std::cout <<"\n";


  //Here The Beginnins Of Iteration Technique 
  
  //We Introduce Two Another Points For Getting Two New Interval Of Uncertainty
  //First Point 'c1' And Second Point 'd1' :
  c[1]=b[1]-(R_Fibo()*I);
  std::cout << "\nPlaced A Point c1 Within The Initial Interval :"<< c[1];
  d[1]=a[1]+(R_Fibo()*I);
  std::cout <<"\nPlaced Another Point d1 Within The Initial Interval :"<<d[1];
  std::cout <<"\n";
  std::cout <<"\n";
  
  //Showing The Starting Reduction :
  //----------------
  //----------------
  std::cout <<"At The First Iteration :\n";
  std::cout <<"The Value Of a1=" << a[1] << "\n";
  std::cout <<"The Value Of b1=" << b[1] << "\n";
  std::cout <<"The Value Of c1=" << c[1] << "\n";
  std::cout <<"The Value Of d1=" << d[1] ;
  //Function 'Fc1' at point 'c1' And Function 'Fd1' at point 'd1':
  //--------------------
  
// write a function which takes one argument and returns the value. use it here instead of explicit coding.
  Fc[1]=(exp(-c[1]))+(c[1]*c[1]);
  std::cout << "\nAt c1 The Function Value Fc1=" << Fc[1];
  //std::cout <<"\n";
  Fd[1]=(exp(-d[1]))+(d[1]*d[1]);
  std::cout << "\nAt d1 The Function Value Fd1=" << Fd[1];
  std::cout <<"\n";
  std::cout <<"\n";
  //---------------------
  //---------------------

  //system("pause");

  // this must be defined outside of main and called here explicitly.
  
  




  double In=b[NI]-a[NI];
  std::cout <<"\nThe Interval Reduction At The Final Iteration :" <<"\nI(n)= " << In;
  std::cout<<"\n";
  
  delete [] a;
  delete [] b;
  delete [] c;
  delete [] d;
  delete [] Fc;
  delete [] Fd;
  

  std::cout << std::endl;
  system("pause");
 //return 0;
}



  //Ratio of two successive terms of Fibonacci Sequence is obtained using Binet's Formula
  //Function (F(m-1)/Fm) Defination :
  double R_Fibo()
  {
  double n1=1-(sqrt((double)5));
  double n2=1+(sqrt((double)5));
  double s=(n1/n2);
  //cout << "\nsThe Value Of s = " << s <<"\n";

  double s1=(sqrt((double)5)-1)/2;
  //cout << "\nThe Value Of s1 = " << s1 <<"\n";

  double RF=s1*((1-pow(s,NI))/(1-pow(s,(NI+1))));
  
  //std::cout << "\nThe Ratio of two consecutive Fibo_Num :"<<"\nRF = " << RF <<"\n"; 
  //std::cout << RF; 

  return RF;

 } 
  

// pass values into F_Ite() function
 void F_Ite(double *a, double *b, double *c, double *d, double *Fc, double *Fd)
 {                          //F_Ite Function Start
  
  for(int k=1;k<(NI-1);k++)
	{						//Main 'for' Loop Start
		std::cout <<"\n";
		system("pause");
		std::cout <<"\n";
		std::cout <<"At The "<<k+1<<" Iteration :\n";
		
	  if(Fc[k]<Fd[k])
	  {                     //Outer 'if' Start
	    a[k+1]=a[k];
		cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
		b[k+1]=d[k];
		cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
		//c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
		//cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		if(k==(NI-1))
		{
		  c[k+1]=c[k+1]+z;
		  cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		}
		else
		{
		c[k+1]=b[k+1]-(0.618034*((1-pow(-0.381966,NI-k))/(1-pow(-0.381966,NI-k+1))))*(b[k+1]-a[k+1]);
		cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		}
		d[k+1]=c[k];
		cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";

		Fc[k+1]=(exp(-c[k+1]))+(c[k+1]*c[k+1]);
		std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
		//std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k] << "\n";

		Fd[k+1]=Fc[k];
		//std::cout <<"The Value Of Fd" << k+1 << "=" << Fc[k] << "\n";
		std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";
				

	  }						//Outer 'if' Close
	   else
	  {                     //Outer 'else' Start
	    a[k+1]=c[k];
		std::cout <<"The Value Of a" << k+1 << "=" << a[k+1] << "\n";
		b[k+1]=b[k];
		std::cout <<"The Value Of b" << k+1 << "=" << b[k+1] << "\n";
		c[k+1]=d[k];
		std::cout <<"The Value Of c" << k+1 << "=" << c[k+1] << "\n";
		//d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
		//std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
		
		if(k==(NI-1))
	  {
	    d[k+1]=d[k+1]+z;
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
	  }

		else
		{
		d[k+1]=a[k+1]+((0.618034)*((1-pow((-0.381966),(NI-k)))/(1-pow((-0.381966),(NI-k+1)))))*(b[k+1]-a[k+1]);
		std::cout <<"The Value Of d" << k+1 << "=" << d[k+1] << "\n";
		}

	  	  
	    Fc[k+1]=Fd[k];
	    //std::cout <<"The Value Of Fc" << k+1 << "=" << Fd[k] << "\n";
		std::cout <<"The Value Of Fc" << k+1 << "=" << Fc[k+1] << "\n";
	    Fd[k+1]=(exp(-d[k+1]))+(d[k+1]*d[k+1]);
	    std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k+1] << "\n";
		//std::cout <<"The Value Of Fd" << k+1 << "=" << Fd[k] << "\n";

	  }						//Outer 'else' Close
	 }					//Main 'for' Loop Close

	  //Another 'if' Condition Start But Within The 'for' Loop
  	  if(Fc[10]<Fd[10])
	{
		std::cout <<"\n";
	  std::cout <<"\nAt Final Iteration :\n";
	  a[NI]=a[NI-1];
	  b[NI]=d[NI-1];
	  std::cout <<"The Value Of a11 =" << a[NI] << "\n";
	  std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}
	else
	{
	  a[NI]=c[NI-1];
	  b[NI]=b[NI-1];
	  std::cout <<"The Value Of a11 =" << a[NI] << "\n";
	  std::cout <<"The Value Of b11 =" << b[NI] << "\n";
	}

}					//F_Ite Function Close

c++ "error C4716: 'F_Ite' : must return a value"

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