Dear all;
i have a problem with functios. i have a program to write using struct in functions with arrays also. i have the program written in structes with array but not using the functions and i don't no who the do it with functions. if anybody acn help i will appreciate it very much. I've been having a big heduce from this problem becuse i don't know how to solve it and also because i only have 1 day to give it for the professor.

include <iostream>
#include <fstream>
#include <string>
#include <iomanip>

using namespace std;

struct Household
{
	int Noperson;
	string letters;
	double income;
};


int main()
{
	ifstream in;
	ofstream out;
	int choice_input,counter, counter2,counter3,index,size;
	double total,average,plevel,percentage;
	Household Survey [50];
	Household Survey2 [50];
	int temp;
	string ctemp;


	in.open("f:\\example.txt");
	out.open("f:\\Rfexample.txt");

	if(!in)
	{
		cout<<"The file cannot be open."<<endl;

		return 1;
	}

	counter=0;
	while (!in.eof() && counter<50)
	{
		in>>Survey[counter].letters;
		in>>Survey[counter].income;
		in>>Survey[counter].Noperson;
		
		counter++;
	}

	for(size = 0; size < counter; size++)
	{
		Survey2[size].letters = Survey[size].letters;
		Survey2[size].income = Survey [size].income;
		Survey2[size].Noperson = Survey[size].Noperson;
	}

		total = 0;
		for(size=0; size < counter; size++)
		{
			total=Survey[size].income + total; 
		}

				
		average= total/counter;

		for(size=0; size < counter-1; size++)
			{
				for( index = 0; index < counter - 1 - size;index++)
				{
					if(Survey2[index].income > Survey2[index+1].income)
					{
						temp = Survey2[index].income;
						Survey2[index].income = Survey2[index+1].income;
						Survey2[index+1].income = temp;

						ctemp = Survey2[index].letters;
						 Survey2[index].letters = Survey2[index+1].letters;
						 Survey2[index+1].letters = ctemp;

						temp = Survey2[index].Noperson;
						 Survey2[index].Noperson = Survey2[index+1].Noperson;
						 Survey2[index+1].Noperson = temp;


					}
						
				}
			}
				

		out<< fixed << showpoint << setprecision(2);

		do
		{
		cout<<"1. Print all of the input data \n";
			cout<<"2. Calculate the average household and find whose income is greater than average \n";
			cout<<"3. Find the percentage of household income \n";	
			cout<<"4. Print all of the input data sorted \n";
			cout<<"5. Calculate and print the median household \n";
			cout<<"6. Quit \n";
			cout<<"Please select a choice: ";
			cin>>choice_input;
			  
			
			if(choice_input==1)
			{
				for(counter2 = 0; counter2 < counter; counter2++)
				{
					
					out << Survey[counter2].letters<<"\t";
					out << Survey[counter2].income<<"\t";
					out << Survey[counter2].Noperson<<"\t";
					out << endl;
					
					cout << Survey[counter2].letters<<"\t";
					cout << Survey[counter2].income<<"\t";
					cout << Survey[counter2].Noperson<<"\t";
					cout << endl;
				}
			}
			if(choice_input==2)
			{
				
				out<<"\nThe total is: "<<total;
				out<<"\nThe average is: "<<average;
				out<<endl;
				
				cout<<"\nThe total is: "<<total;
				cout<<"\nThe average is: "<<average;
				cout<<endl;
				
				for(size=0; size < counter; size++)
				
				{
					if( Survey[size].income > average)
					{
						out <<"\nThe Above averge is:"<<endl;
						out << Survey[size].letters<<"\t";
						out << Survey[size].income<<"\t";
						out << Survey[size].Noperson<<"\t";
						out << endl;
						
						cout <<"\nThe Above averge is:"<<endl;
						cout << Survey[size].letters<<"\t";
						cout << Survey[size].income<<"\t";
						cout << Survey[size].Noperson<<"\t";
						cout << endl;	
					}
				}
					
				

			}
			if(choice_input==3)
			{
				counter3=0;
				

				for(size=0; size < counter; size++)
				{
					plevel=8000.00 + 500.00 * (Survey[size].Noperson - 2);
					
					if(Survey[size].income < plevel)
					{
						counter3++;
					}
					
				}
				percentage= (static_cast<double>(counter3) / counter)*100;
				out<<"\nThe percentage is: "<<percentage<<endl;

				cout<<"\nThe percentage is: "<<percentage<<endl;
				

			}

			if(choice_input==4)
			{
				for(size = 0; size<counter; size++)
				{
					
					 out<<Survey2[size].letters<<"\t";
					 out<<Survey2[size].income<<"\t";
					 out<<Survey2[size].Noperson<<"\t";
					 out << endl;
					 
					 cout<<Survey2[size].letters<<"\t";
					 cout<<Survey2[size].income<<"\t";
					 cout<<Survey2[size].Noperson<<"\t";
					 cout << endl;
				}

			}
		
			if(choice_input==5)
			{
				double median;
				median=(Survey2[8].income + Survey2[9].income)/2;
				out<<"\nThe median is: "<<median<<endl;

				cout<<"\nThe median is: "<<median<<endl;
				
			}

			
			if (choice_input <1 || choice_input>6)		// to state that choice was wrong in the main menu.
					cout<<"\n\n You've entered a wrong choice! Please choose again. \n\n";

		}while (choice_input !=6 );





	in.close();
	out.close();

	return 0;
}

CAN ANYBODY HELP ME IN THIS PROBLEM

It's not clear to me what you want. But here is very basic code for structs.

struct Household
{
	int Noperson;
	char letters[20];
	double income;
};
/* find the maximum income */
struct Household *foo(struct Household *src, int cnt)
{
    struct Household *p=src;
    struct Household *retval=src;
    double max = -999999.
    int i=0;
    while(i<=cnt)
    {
         if(p->income > max)
         {
              max=p->income;
              retval=p;
         }
         cnt ++;
         p++;
    }
    return retval;
}

int main()
{
     struct Household arr[100]={0,NULL,0.}
     struct Household *p=arr;
     int cnt=0;
     int i=0;
     for (i=0;i<100; i++, p++)
     {
           p->Noperson=i;
           p->income= i*2.;
           strcpy(p-Letters,"Hi there");
           cnt++;
     }
     p=foo(arr,cnt);
     printf("Maximum income %f\n",p->income);
}
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