Question

How to swap pairs of characters in a string with C++

Answer 1

#include <vector>
#include <iostream>

std::string SwapPairs(std::string str) {
	if (str == "") {
		return str;
	}

	std::vector<char> vec(str.begin(), str.end());

	for (int i = 0; i < vec.size() - 1; i += 2) {
		char tmp = vec[i];
		vec[i] = vec[i + 1];
		vec[i + 1] = tmp;
	}
	
	std::string s(vec.begin(), vec.end());

	return s; 
}

int main(void) {
	std::string str = "aBcDeFgHiJkL";

	std::cout << SwapPairs(str);
}




/*
run:

BaDcFeHgJiLk

*/

 

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