Hello,
I'm having a bit of trouble figuring out how to get C++ to output something to a text file. Any help would be very appreciated. Here is the code:
//THIS PROGRAM IS INTENDED TO GENERATE THE SQUARE ROOT OF AN INPUTTED NUMBER USING A WHILE LOOP AND A USER
//SUBMITTED GUESS FOR THE SQUARE ROOT. THE DIFFERENCE BETWEEN THE USERS ESTIMATE AND THE ACTUAL SQUARE ROOT WILL
//BE COMPARED TO EACH OTHER UNTIL THEY ARE WITHIN AN ACCEPTABLE RANGE OF EACH OTHER. WHEN THE TWO NUMBERS ARE WITHIN
//THE ACCEPTABLE RANGE, THIS NUMBER WILL BE RETURNED TO THE USER AS THE SQUARE ROOT.
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;
//VOID FUNCTIONS
void getValues(float&, float&, bool&); //RECEIVES INPUT FROM THE USER
void newGuess(float, float, float&); //CALCULATES NEXT GUESS
void swap(float&, float&); //NEXT GUESS AND LAST GUESS ARE SWAPPED IF NECESSARY
//MAIN PROGRAM
int main()
{
//DECLARED VARIABLES AND FUNCTIONS
float ng=0.0; //NEXT GUESS
float lg=0.0; //LAST GUESS
float n=0.0; //SQUARE ROOT OF A NUMBER
float difference=0.0;
bool dataok = false;
bool done = false;
int count=0;
getValues(n,lg,dataok);
while((done==false))
{
newGuess(n,lg,ng);
difference = (lg - ng);
if ((difference > 0.005) || (difference < -0.005))
{
cout<< "The last guess was: " <<lg <<endl;
cout<< "" <<endl;
cout<< "The next guess for the square root is: " <<ng;
swap(lg , ng);
cout<<endl;
done=false;
count++;
}
else
{
cout<< "The square root of the number is: " <<ng <<endl;
cout<< "and it took " <<count <<" attempts" <<endl;
done=true;
}
}
return 0;
}
//DESCRIPTION:GET VALUES FOR VOID FUNCTION
//PARAMETERS: MODIFY THE VARIABLES N, NUMBER, AND LG, LAST GUESS
//IN: N, NUMBER, AND LG, LAST GUESS, BY REFERENCE
//OUT:
//INOUT:
//RETURNS: NONE
void getValues(float& a, float& b, bool& dataok) //TAKES INPUT FROM USER AND ASSIGNS THEM TO VARIABLES
{
cout<< "This is a square root calculator." <<endl;
cout<< "" <<endl;
cout<< "Input the positive number for which you want to know the square root: ";
cin>> a; //INPUT NUMBER TO FIND SQUARE ROOT
cout<< endl <<"Input the positive number that is your guess of the square root: ";
cin>> b; //INPUT NUMBER TO USE AS LAST GUESS
while(!((a>0) && (b>0) && (b<= (a/2))))
{
dataok=false;
cout<< "Sorry, one or more of your values is not acceptable. Please try again."<<endl<<endl<<endl;
cout<< "" <<endl;
cout<< "This is a square root calculator." <<endl;
cout<< "" <<endl;
cout<< "Input the positive number for which you want to know the square root: ";
cin>> a; //INPUT VALUE FROM USER FOR NUMBER TO FIND SQUARE ROOT OF
cout<< "" <<endl;
cout<< endl <<"Input the positive number that is your guess of the square root: ";
cin>> b;
}
dataok=true;
}
//DESCRIPTION: SWAPS THE TWO VARIABLES (NEXT GUESS AND LAST GUESS)
//PARAMETERS: FLOAT A AND FLOAT B
//IN:
//OUT:
//INOUT:
//RETURNS:
void swap (float& a, float& B) //SWAPS NEXT GUESS TO LAST GUESS
{
float temp;
temp = a;
a = b;
b = temp;
}
void newGuess(float number, float lastGuess, float& nextGuess) //DETERMINES THE VALUE OF NEXT GUESS
{
nextGuess =(0.5f*(lastGuess + number/lastGuess));
std::cin.ignore();
std::cin.get();
ofstream lab4("lab4.txt");
lab4 <<"The submitted value was " << temp << "and its square root was " << nextGuess << "." <<endl; //line 103
lab4.close();
return 0; //line 105
}the error messages i get are:
(103) : error C2065: 'temp' : undeclared identifier
and
(105) : error C2562: 'newGuess' : 'void' function returning a value
thank you!
