Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define name1 "denny"
#define pass1 "123"

int main(int argc, char *argv[])
{  
    char * name;
    char * pass;

    if(argc != 3)
    {        
        printf("Usage: login Your_Username Your_Password\n");
         exit(1);
    }

    name = argv[1];
    pass = argv[2];    

    if(strcmp(name,name1) == 0 && strcmp(pass,pass1) == 0)
       printf("Correct username and password\n");
    else
       printf("Wrong username and password\n");

    return 0;
}