Cifrado Cesar

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

#define DELTA 5

int main()
{
    char string[128], string2[128];

    scanf("%s", string);

    int len = strlen(string);

    int i;
    char c;

    for(i = 0; i < len; i++)
    {
        c = string[i] + DELTA;

        if(c > 'Z')
            c = 'A' + (c - 'Z');

        string2[i] = c;
    }

    string[i] = 0;
    puts(string);
    exit(EXIT_SUCCESS);
}