Check Prime Number in C

A simple in C programming to ask the user to give a number and then it will check if the given number is a prime number or not.

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Program Listing

prime.c

#include <stdio.h>

main( )
{
int   num, i ;

printf ( "Enter a number " ) ;
scanf ( "%d", &num ) ;

i = 2 ;
while ( i <= num - 1 )
{
if ( num % i == 0 )
{
printf ( "Not a prime number" ) ;
break ;
}
i++ ;
}

if ( i == num )
printf ( "Prime number" ) ;

}