c++ - 密码无效

Question

我最近开始学习c++，并且我一直在尝试创建解决方案来挑战自己，这些挑战之一是对文本进行加密并将其最终保存到文本文件中的密码。我当前使用的代码无法编译，因为它无法识别replace语句，这是到目前为止的代码。

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <Windows.h>
#include <string>

int main()
{
// declare all variables
std::string text;
std::string s;
std::string uncipheredText;

//Introducing the program
std::cout << "Welcome to Cipher." << std::endl;

//Asks the user to input the text they want to encrypt and saves it to the unciphered text variable.
std::cout << "Enter the text you want to cipher" << std::endl;
std::cin >> s;

//replaces all characters in the variable "s"
std::replace(s.begin(), s.end(), 'Q', 'M');
std::replace(s.begin(), s.end(), 'E', 'B');
std::replace(s.begin(), s.end(), 'T', 'C');
std::replace(s.begin(), s.end(), 'U', 'Z');
std::replace(s.begin(), s.end(), 'O', 'S');
std::replace(s.begin(), s.end(), 'L', 'F');
std::replace(s.begin(), s.end(), 'J', 'H');
std::replace(s.begin(), s.end(), 'G', 'K');
std::replace(s.begin(), s.end(), 'D', 'P');
std::replace(s.begin(), s.end(), 'A', 'I');
std::replace(s.begin(), s.end(), 'X', 'Y');
std::replace(s.begin(), s.end(), 'V', 'R');
std::replace(s.begin(), s.end(), 'N', 'W');
std::replace(s.begin(), s.end(), ' ', '#');


s = text;

std::cout << "Encrypted Text: " << text << std::endl;

//replaces all characters in the variable "s"
std::replace(s.begin(), s.end(), 'Q', 'M');
std::replace(s.begin(), s.end(), 'E', 'B');
std::replace(s.begin(), s.end(), 'T', 'C');
std::replace(s.begin(), s.end(), 'U', 'Z');
std::replace(s.begin(), s.end(), 'O', 'S');
std::replace(s.begin(), s.end(), 'L', 'F');
std::replace(s.begin(), s.end(), 'J', 'H');
std::replace(s.begin(), s.end(), 'G', 'K');
std::replace(s.begin(), s.end(), 'D', 'P');
std::replace(s.begin(), s.end(), 'A', 'I');
std::replace(s.begin(), s.end(), 'X', 'Y');
std::replace(s.begin(), s.end(), 'V', 'R');
std::replace(s.begin(), s.end(), 'N', 'W');
std::replace(s.begin(), s.end(), ' ', '#');

s = uncipheredText;

std::cout << "Decrypted Text: " << uncipheredText << std::endl;

/*
ofstream myfile;
myfile.open("dump.txt");
myfile << text;
myfile.close();
*/

return 0;
}   

Answer 1

如@AlgirdasPreidžius的评论中所述，您需要包括算法库。另外，您重复了以下代码:

//replaces all characters in the variable "s"
std::replace(s.begin(), s.end(), 'Q', 'M');
std::replace(s.begin(), s.end(), 'E', 'B');
std::replace(s.begin(), s.end(), 'T', 'C');
std::replace(s.begin(), s.end(), 'U', 'Z');
std::replace(s.begin(), s.end(), 'O', 'S');
std::replace(s.begin(), s.end(), 'L', 'F');
std::replace(s.begin(), s.end(), 'J', 'H');
std::replace(s.begin(), s.end(), 'G', 'K');
std::replace(s.begin(), s.end(), 'D', 'P');
std::replace(s.begin(), s.end(), 'A', 'I');
std::replace(s.begin(), s.end(), 'X', 'Y');
std::replace(s.begin(), s.end(), 'V', 'R');
std::replace(s.begin(), s.end(), 'N', 'W');
std::replace(s.begin(), s.end(), ' ', '#');