从大写变为小写C ++ [英] Change from uppercase to lowercase C++

问题描述

我想将输入从大写改为小写，例如。如果输入是R - 它更改为r。我想它与字符串不是char。我试过这个

I want to change the input from uppercase to lowercase, eg. if the input is R - it changes to r. I want it with string not char. I have tried this

one=tolower(one);
two=tolower(two);

但无效。

#include <cctype>
#include <iostream>
using namespace std;

int main () {
    string one;
    string two;
    cout << "\nPlayer One, please enter your move: ('p'  for Paper, 'r' for Rock, '$
    cin >> one;

    cout <<"\nPlayer Two, please enter your move: ('P' for Paper, 'R' for Rock, 'S'$
    cin >> two;

推荐答案

您可以使用 std :: transform 右 std :: tolower overload：

You can use std::transform and the right std::tolower overload:

#include <cctype>    // std::tolower
#include <algorithm> // std::transform

std::transform(one.begin(), one.end(), one.begin(),
               [](char c)
               { return std::tolower(static_cast<unsigned char>(c));});

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