Question

How to reverse string without temporary variable in C

Answer 1

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

void ReverseStringWithoutTemporaryVariable(char str[]) {
    int start = 0, end = strlen(str) - 1;

    while (start < end) {
        str[start] ^= str[end]; // XOR used to swap two variables
        str[end] ^= str[start];
        str[start] ^= str[end];
        start++;
        end--;
    }
}

int main() {
    char str[] = "c++ java c";

    ReverseStringWithoutTemporaryVariable(str);

    puts(str);
}





/*
run:

c avaj ++c


*/

 

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