Question

enter image description here我编写了C ++程序，该程序要求用户提供两个数字和一个运算符，并根据输入给出输出。我认为一切正确，但输出不是所需的输出。

#include <iostream>

using namespace std;

int main()
{
    int num1;
    string op;
    int num2;
    string result;

    cout << "Enter a number: ";
    cin >> num1;
    cout << "Enter a operator: ";
    cin >> op;
    cout << "Enter another number: ";
    cin >> num2;

    if (op == "+"){  //if user types '+' the result is num1 + num2
        result = num1 + num2;
        //cout << result;
    }else if (op == "-"){ //if user types '-' the result is num1 - num2
        result = num1 - num2;
       // cout << result;
    }else if (op == "*"){ //if user types '*' the result is num1 * num2
        result = num1 * num2;
        //cout << result;
    }else if (op == "/"){ //if user types '/' the result is num1 / num2
        result = num1 / num2;
        //cout << result;
    }else{
        cout << "Invalid operator...";
    }
    cout << result;



    return 0;
}

输出应该是整数。但是输出只是一个菱形。

Answer 1

将变量结果声明为int类型

int result = 0;

或者将其声明为

long long int result = 0;

并像使用它

result = static_cast<long long int>( num1 ) * num2;

程序中的类型为std::string

string result;

我没有得到数字作为输出，而是表情符号

1 个答案: