1.3 代码规范

#include <iostream>
using namespace std;

int main()
{
    double A, B, D;
    cout << "请输入数字A" << endl;
    cin >> A;
    cout << "请选择输入符号（+、-、*、/）：" << endl;
    char C;
    cin >> C;
    cout << "请输入数字B" << endl;
    cin >> B;
   
    switch(C)
    {
    case '+':
        D = A+B;
        break;
    case '-':
        D = A-B;
        break;
    case '*':
        D = A*B;
        break;
    case '/':
        if (B != 0)
        {
            D = A/B;
        }
        else
            cout << "除数不能为0" << endl;
        break;
    }
   
    cout << "结果是：" << D << endl;
   
    return 0;
}