simepledemo.c

#include <stdlib.h>
#include <stdio.h>

int add(int x, int y) {
        int z = 10;
        z = x + y;
        return z;
}

main (int argc, char **argv) {
        int a = atoi(argv[1]);
        int b = atoi(argv[2]);
        int c;
        char buffer[100];

        gets(buffer);
        puts(buffer);

        c = add(a,b);
        printf("Sum of %d+%d = %d\n", a, b, c);

        exit(0);
}