Fahrenheit-Celsius converter.

#include <iostream.h>
#include <iomanip.h>
#include <stdlib.h>

void c_to_f(void);
void f_to_c(void);

void
main(void)
{
int choice;
char again;
do
{
system("CLS");

cout << setw(10) <<" "<< "What conversion would you like to make?\n"; // menu
cout << setw(20) <<" "<< "1. Celsius to Fahrenheit\n\n"; // make a choice which function to use.
cout << setw(20) <<" "<< "2. Fahrenheit to celsius\n\n";
cin >> choice;

switch(choice) // go to chosen function.
{
case 1 :
{
c_to_f();
break;
}
case 2 :
{
f_to_c();
break;
}
default :
{
cout << setw(10) <<" "<< "you must enter 1 or 2 "<< endl ; // validate and correct input of function choice.

}


}



cout << setw(10) <<" "<< "Do you wish to do another conversion? y for yes, n for no "; // rerun loop on y for yes
cin >> again;
}while (again == 'Y' || again =='y');

}


void c_to_f(void)
{
system("CLS"); // clear screen for function data.
int temp,fahrenheit;

cout << "\n\n\n";
cout << setw(10) <<" "<< "Enter the temperature in whole degrees celsius. \a";
cin >> temp;

fahrenheit = ((temp * 9) / 5) + 32;
cout << endl << setw(10) <<" "<< temp << " degrees celsius is " << fahrenheit << " degrees fahrenheit \a\n\n\n";
}

void f_to_c(void)
{
system("CLS"); // clear screen for function data.
int temp,celsius;

cout << "\n\n\n";
cout << setw(10) <<" "<< "Enter the temperature in whole degrees fahrenheit. \a";
cin >> temp;

celsius = ((temp - 32) * 5) / 9;

cout << endl <<setw(10) <<" "<< temp << " degrees fahrenheit is " << celsius << " degrees celsius \a\n\n\n";
}