更改大写字母（从cin读取）到小写？ [英] Changing a capital letter (read from cin) to lower case?

问题描述

我想改变大写字母为小写的输入，例如如果cin >> one
one = R它应该是r所以它自动转换

  #include< cctype> 
 #include< iostream> 
 
 using namespace std; 
 int main（）
 {
 string one; 
 string two; 
 cout<< \ nPlayer One，请输入您的移动：（'p'表示纸张，'r'表示岩石，'$ 
 cin>>一个; 
 
 cout< \ nPlayer Two，请输入您的移动：（'P'表示纸张，'R'表示岩石，'S'表示$ 
 cin表示两个; 
  
 
 
解决方案
您可以使用transform编写代码：
 
 
 <$一个，请输入您的移动：（'p'表示纸张，'r'表示纸张，对于Rock，'<  cin>> one; 
 
 std :: transform（one.begin（），one.end one.begin（），:: tolower）; 
 cout< <\\\
Player二，请输入您的移动：（'P'表示纸，'R'表示摇滚，'S'& < std :: endl; 
 cin>> two; 
 std :: transform（two.begin（），two.end（），two.begin（），:: tolower）; 
 std :: cout<<one =<   

输出可能如下（对于R，P）：

 玩家一，请输入您的行动：（'p'表示纸，'r'表示摇滚，'
 R 
 
玩家二，请输入你的移动：（'P'为纸，'R'为摇滚，'S'
 P 
 one = r; two = p 
  




i wanna change the capital cin to lower case for the input , for example if cin>> one one=R it should be r so it convert it automatically

    #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;

解决方案

You can write your code using transform:

string one;
string two;
cout << "\nPlayer One, please enter your move: ('p'  for Paper, 'r' for Rock, '" << std::endl;
cin >> one;

std::transform(one.begin(), one.end(), one.begin(), ::tolower);
cout <<"\nPlayer Two, please enter your move: ('P' for Paper, 'R' for Rock, 'S'" << std::endl;
cin >> two;
std::transform(two.begin(), two.end(), two.begin(), ::tolower);
std::cout << "one=" << one << " ; two=" << two << std::endl;

The output may be as follows (for R, P):

Player One, please enter your move: ('p'  for Paper, 'r' for Rock, '
R

Player Two, please enter your move: ('P' for Paper, 'R' for Rock, 'S'
P
one=r ; two=p

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