Question

How to decrypt a string from numbers to characters in C

Answer 1

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

char convert_to_char_code(char str[]) {
    int num = (int)strtol(str, (char**)NULL, 10);

    return num + 96;
}

void decrypt(char s[], char result[]) {
    int i = 0, j = 0;

    while (i < strlen(s)) {
        char ch, buffer[3] = "";

        if (s[i + 2] == '#') {
            memcpy(buffer, &s[i], 2);
            ch = (char)convert_to_char_code(buffer);
            i += 2;
        }
        else {
            memcpy(buffer, &s[i], 1);
            ch = (char)convert_to_char_code(buffer);
        }

        i++;

        result[j++] = ch;
    }
}

int main()
{
    char result[128] = "";

    decrypt("10#1426#25#524#", result);

    puts(result);

    return 0;
}




/*
run:

jadzyex

*/

 

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