C Program To Add Two Numbers Using Command Line Arguments Parameters

#include<stdio.h>

void main(int argc , char * argv[])
{
    int i,sum=0;

    if(argc!=3)
      {
      printf("you have forgot to type numbers.");
      exit(1);
      }

    printf("The sum is : ");

    for(i=1;i<argc;i++)
        sum = sum + atoi(argv[i]);

    printf("%d",sum);

}