C Program - Command Line Program to Check if a Number is Prime or Not

C Programming Language Command Line Arguments (Article) Command Line Arguments (Program)

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Program:

#include <stdio.h>

int main(int argc, char *argv[])

{

             int n, i, flag = 0;

             n = atol(argv[1]);

            for(i=2; i<=n/2; ++i)

   {

            if(n%i==0)

      {

            flag=1;

            break;

      }

   }

   if (flag==0)
            printf("%d is a prime number.",n);
   else
            printf("%d is not a prime number.",n);
   return 0;

}

Output:

13

13 is a prime number.

Explanation:

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