C++ Calculator总是返回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,它返回"7208640"作为答案:

系统将要求您输入两个数字和运算符.

目前支持的运营商是:

增加:+

减法: -

乘法:*

事业部:

模数:%

第一个数字:6

第二个数字:2

接线员:/

6/2 = 7208640

进程返回0(0x0)执行时间:4.612 s按任意键继续.

Answer 1

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

应该

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

int sum除了第一个以外,其他所有人都一样.您声明一个变量,而不是每次使用它.