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.
Sample Input
23
Sample Output 23 is a prime number.