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

union intandstring {
	char *as_char;
	int *as_int;
};

int main(int argc, char ** argv){
	if(argc < 3){
		printf("Usage:  %s key string\n", argv[0]);
		return 1;
	}	
	printf("About to encrypt:  %s\n", argv[2]);
	
/* For each 4-byte section:
 * 	Add the key
 * 	move on (nothing more to do)
 */
	int key = atoi(argv[1]);
	int len = strlen(argv[2]);
	union intandstring data;
	data.as_char = argv[2];

	// From this point on, we don't refer to argv
	for(int i = 0; i < len/4; i++)
		data.as_int[i] += key;

	write(1, data.as_char, len);
	return 0;
}