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C++ Programming : Program 10-A

Program to enter an integer and print if it is prime or composite


 

#include <iostream.h>
#include <conio.h>
#include <process.h>

void main()
{
clrscr();
int num1,x;
cout << "Enter an integer : " << endl;
cin>>num1;
for(x=2;x<num1;x++)
{
if(num1%x==0)
{
cout << num1 << " is a composite number." << endl;
getch();
exit(0);
}
else
{
cout << num1 << " is a prime number." << endl;
getch();
exit(0);
}
}
}

This program takes in an integer num1 as a screen input from the user.
It then determines whether the integer is prime or composite.
It finally outputs the approriate message by writing to the 'cout' stream.

23

23 is a prime number.

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