Question

How to reverse string without temporary variable in C++

Answer 1

#include <iostream>

void ReverseStringWithoutTemporaryVariable(std::string &str) {
    int start = 0, end = str.length() - 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() {
   std::string str = "c++ java c";
   
   ReverseStringWithoutTemporaryVariable(str);
   
   std::cout << str;
}




/*
run:

c avaj ++c

*/

 

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