C++ 计算器总是 returns 7208640

Question

这是我的计算器的代码：

#include <iostream>
using namespace std;

int main()
{
    int fNumber, sNumber, sum;
    string op;
    cout << "You will be asked for two numbers and the operator to use on them.\nCurrently supported operators are:\n";
    cout << "    Addition: +\n    Subtraction: -\n    Multiplication: *\n    Division: \\n    Modulo: %\n\n";

    cout << "First Number: ";
    cin >> fNumber;
    cout << "\nSecond Number: ";
    cin >> sNumber;
    cout << "\nOperator: ";
    cin >> op;

    if(op == "+"){
        int sum = fNumber + sNumber;
    } else if(op == "x" || op == "*"){
        int sum = fNumber * sNumber;
    } else if(op == "/"){
        int sum = fNumber / sNumber;
    } else if(op == "-"){
        int sum = fNumber - sNumber;
    } else if(op == "%"){
        int sum = fNumber % sNumber;
    } else{
        cout << "\nPlease use a correct Operator\n";
        return 1;
    }

    cout << "\n" << fNumber << " " << op << " " << sNumber << " = " << sum << "\n";

    return 0;
}

我完全不知道为什么，但出于某种原因，无论我给它什么数字或运算符 returns“7208640”作为答案：

You will be asked for two numbers and the operator to use on them.

Currently supported operators are:

Addition: +

Subtraction: -

Multiplication: *

Division: \

Modulo: %

First Number: 6

Second Number: 2

Operator: /

6 / 2 = 7208640

Process returned 0 (0x0) execution time : 4.612 s Press any key to continue.

Answer 1

if(op == "+"){
    int sum = fNumber + sNumber;

应该是

if(op == "+"){
    sum = fNumber + sNumber;

除第一个外，其他所有 int sum 都相同。你声明一个变量一次，而不是每次使用它。

Answer 2

同上，从 if 语句中删除 int 声明。

此外，请将求和变量的名称更改为类似"answer."减法、乘法、除法和模的结果分别称为差、积、商和余数。

C++ 计算器总是 returns 7208640

C++ Calculator always returns 7208640

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math

calculation