Monday, December 13, 2010

Program to check whether the entered number is prime or not

#include<stdio.h>

int 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" ) ;
    return 0;
}

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