C++代码中的四个错误，我找不到解决方案

Question

我正在看一些我正在处理的代码，有3-4个错误我已经尝试了大约一周的时间来处理，但我就是做不到！我是编程新手，所以如果你能用愚蠢的方式回答，那就太好了！下面是代码。

#include <iostream>
#include <string>


using namespace std;

int main() {
    string password;

    int choice;

    cout << "Command Line Multi-Tool" << endl;
    cout << endl;
    cout << "plase enter your password: " << endl;
    cin >> password;
    if (password == "creeper1") {
        cout << endl;
        cout << "Main Menu" << endl;
        cout << "1. Class Schedule" << endl;
        cout << "2. School Info" << endl;
        cout << "3. Exit" << endl;
        cin >> choice;
    }
    else {
        cout << "Incorrect, Access Denied" << endl;
        return(0);
    }

    }

    else (password == "admin1"){
        cout << "/*adminLogin=='1'*/" << endl;
        cout << endl;
        cout << "Menu::Main" << endl;
    }

    return(0);

    }

}

这是错误日志。

/Users/student/Documents/TO BE FILED/Tuesday/main.cpp:31:0 /Users/student/Documents/TO BE
FILED/Tuesday/main.cpp:31: error: expected unqualified-id before 'else'


/Users/student/Documents/TO BE FILED/Tuesday/main.cpp:36:0 /Users/student/Documents/TO BE
FILED/Tuesday/main.cpp:36: error: expected unqualified-id before 'return'


/Users/student/Documents/TO BE FILED/Tuesday/main.cpp:36:0 /Users/student/Documents/TO BE
FILED/Tuesday/main.cpp:36: error: expected declaration before '}' token

再次，非常感谢！

Answer 1

您的代码中有一个if，但有两个else分支。决定你想要哪一个，失去另一个。查看您可能需要的代码

 if (password == "creeper1") {
    cout << endl;
    cout << "Main Menu" << endl;
    cout << "1. Class Schedule" << endl;
    cout << "2. School Info" << endl;
    cout << "3. Exit" << endl;
    cin >> choice;
 } else if (password == "admin1")
    // Your processing code here
 }  else {
    cout << "Incorrect, Access Denied" << endl;
    return(0);
 }

Answer 2

不平衡的else，即没有对应的if。

也许你想要这样的东西：

if (password == "creeper1") {
}
else if (password == "admin1") {
}
else {
}

Answer 3

你不能在else之后使用else if，这个块永远不会返回，正确的语法是executed.Also 0，而不是return(0)。

您还可以包含额外的大括号，但是如果您以正确的方式缩进代码，您将看到代码块何时结束和开始，因此您很少犯像添加额外的大括号这样的错误：

#include <iostream>
#include <string>


using namespace std;

int main()
{
    string password;

    int choice;



    cout << "Command Line Multi-Tool" << endl;
    cout << endl;
    cout << "plase enter your password: " << endl;
    cin >> password;
    if (password == "creeper1")
    {
        cout << endl;
        cout << "Main Menu" << endl;
        cout << "1. Class Schedule" << endl;
        cout << "2. School Info" << endl;
        cout << "3. Exit" << endl;
        cin >> choice;
    }
    else if(password == "admin1")
    {
        cout << "/*adminLogin=='1'*/" << endl;
        cout << endl;
        cout << "Menu::Main" << endl;
    }
    else
    {
        cout << "Incorrect, Access Denied" << endl;
        return 0;
    }
    return 0;
}

这是带有所有语法错误的代码，fixed.About语义我不知道它是否可以工作，但是现在你可以编译并执行它，来测试代码。