switch语句C++ - 错误C2046：非法的情况下，错误C2043：非法断点

Question

#include <iostream> 
#include <string> 

using namespace std; 

//void multiply(int b); 

int main() 
{ 
float total = 0; 
float b = 0; 
cout << "Enter number: " << endl; 
cin >> b; 


char TorD; 
cout << "Would you like to times (*), divide (/), add (+) or minus (-) this number?" << endl; 
cin >> TorD; 

switch (TorD) 

    case '*' : 
{ 
    int c=0; 
    cout << "by how many?" << endl; 
    cin >> c; 
    total = b * c; 
    cout << b << " * " << c << " = " << total << endl; 

} 
break; 
    case '/' : 
    { 
    int c=0; 
    cout << "by how many?" << endl; 
    cin >> c; 
    total = b/c; 
    cout << b << "/" << c << " = " << total << endl; 

    } 
    break; 

    case '+' : 
    { 
    int c=0; 
    cout << "by how many?" << endl; 
    cin >> c; 
    total = b + c; 
    cout << b << " + " << c << " = " << total << endl; 

    } 
    break; 

    case '-' : 
    { 
    int c=0; 
    cout << "by how many?" << endl; 
    cin >> c; 
    total = b - c; 
    cout << b << " - " << c << " = " << total << endl; 

    } 
    break; 

    default: 

    cout << "You did not correctly enter /, *, +, or - !!" << endl; 

    //multiply(b); 

    system("pause"); 
    return 0; 

} 

Answer 1

你错过了switch (TorD)后开括号，所以“休息”是任何语句外，从（即休息有突破在一个循环或开关内部，所以它有一些东西可以打破）。 switch语句应该如下所示：

switch (TorD) { 
    case '*': { 
     // ... 
    } 
    break; 
    case '/': { 
     // ... 
    } 
    break; 

    // ...and so on. 
} 

Answer 2

您在切换后忘记了case语句周围的大括号。

Answer 3

您需要括号为交换机：

switch (...) 
{ // your forgot this 
    ... 
} // and this