Question

How to shift each letter in a string N places up in the alphabet with C

Answer 1

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

char* shiftEachLetterNPlacesUp(char* str, int N) {
    int len = strlen(str);
    
    char* result = malloc(len + 1);
    
    for (int i = 0; i < len; i++) {
        char ch = str[i];
        int asciiCode = (int)ch + N;
        if ((asciiCode >= 97 && asciiCode <= 122) || (asciiCode >= 65 && asciiCode <= 90)) {
            result[i] = (char)asciiCode;
        } else {
            result[i] = ch;
        }
    }
    
    result[len] = '\0';
    
    return result;
}

int main() {
    char* result = shiftEachLetterNPlacesUp("8a Fkq", 3);
    
    printf("%s\n", result);
    
    free(result);
    
    return 0;
}



/*
run:
   
8d Int
   
*/

 

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