Rot13 in C

Welcome to the Rot13 in C page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

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

void rot13(char *str) {
    for(int i = 0; str[i] != '\0'; i++) {
        char c = *(str + i);
        if(('a' <= c && 'n' > c) || ('A' <= c && 'N' > c)) {
            *(str + i) += 13;
        } else if(('n' <= c && 'z' >= c) || ('N' <= c && 'Z' >= c)) {
            *(str + i) -= 13;
        }
    }
}

int main(int argc, char *argv[]) {
    if(argc == 2 && strlen(argv[1]) != 0 && !isdigit(*argv[1])) {
        rot13(argv[1]);
        printf("%s\n", argv[1]);
    } else {
        printf("Usage: please provide a string to encrypt\n");
    }
    
    return 0;
}

Rot13 in C was written by:

• Softizo

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

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