C++ program to convert given string to lower case

Following C++ program shows you how to convert given string to lower case.

#include <iostream>
#include <string>
#include <algorithm>
int main() {
  std::string data = "SAMPLE STRING";
  // convert string to back to lower case
  std::for_each(data.begin(), data.end(), [](char & c) {
      c = ::tolower(c);
  });
  std::cout << "In Lower Case : " << data << std::endl;
}

Output:

sample string

Try it Online here https://onecompiler.com/cpp/3x73f94pa