How to xor two string in C?

Question

I have 2 string value. str and str2 . i wish to xor the str and str2

My code is

#include <stdio.h>

int main(){
    char str[]   =  "Hello";
    char str2[]  =  "World";
    char outupt;

    output = str[] ^ str2[]; 
    printf("%s",output)   

    return 0;
}

I understand what does to xor two bits (or booleans) means, but what's your definition of _xoring_ strings ? — Thomas W., Sep 15 '16 at 23:13
In C, a string is just an array of `char` with a NUL character at the end. `str` and `str2` are arrays of six bytes. `output` is just one byte. So it's not clear what you're trying to accomplish. — user3386109, Sep 15 '16 at 23:15
@user3386109 may be i wrong at str[] ^ str2[] . how to xor above 2 strings with loop? — Min Ko Ko, Sep 15 '16 at 23:17
@ThomasWilmotte if you ok i need to see both, but i want char by char — Min Ko Ko, Sep 15 '16 at 23:17

yano · Accepted Answer · 2016-09-15T23:26:55.467

5

character by character:

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

int main(){
  int i;
  char str[]   =  "Hello";
  char str2[]  =  "World";
  char output[6];

  for (i=0; i<strlen(str); i++)
  {
    char temp = str[i] ^ str2[i];
    output[i] = temp;
  }

  output[i] = '\0';
  printf("%s", output);

  return 0;
}

Of course you'll need to make sure output is large enough to hold the result (including the null terminator) and you'll need to decide what to do if str and str2 aren't the same length.

edited Sep 15 '16 at 23:26

answered Sep 15 '16 at 23:16

yano

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thanks bro but edit printf("%s",output); and char output[6]; – Min Ko Ko Sep 15 '16 at 23:24
@MinKoKo Ahh ok, thanks. Same for your question, I copied and pasted from there. – yano Sep 15 '16 at 23:26

How to xor two string in C?

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