IF声明中的多个condiotions

Question

我收到一个我不理解的错误,因为我是C++的新手.该if陈述在这种情况下有问题:

#include <iostream>
#include <string>
#include <cmath>
using namespace std;

int main()
{
    string username;
    int password;

    cout << " Welcome User, Please Login." << endl;
    //Username
    cout << "Username: ";
    cin >> username;
    //Password
    cout << "\nPassword: ";
    cin >> password;

    if (username == 'admin' && password == '852456')
        cout << "Welcome." <<endl;
    else
        cout << "Wrong credentials." <<endl;

    return 0;
}

Answer 1

if (username == 'admin' && password == '852456')

应该

if (username == "admin" && password == 852456)

使用'admin'没有意义,这些标记仅适用于诸如此类的字符char alpha = 'a'."用于字符串(多个字符).数字不需要其中任何一个,它们只是数字.