c++ - 需要帮助从类中调用函数

Question

我无法从 class OperateClass 中选择函数

它询问用户“你想加、减、乘还是除？我想:”(在 main 中)。无论我输入什么，它都会转到函数 int add。我究竟做错了什么？

#include <iostream>

using namespace std;

int x = 1;
int number;
int total = 0;
int amt = 1;
int a;
int b;
int c;
int d;
string ans;

class OperateClass{
    public:
        int add(){
            while(x <= 2){
                cout << "Enter a number to use to add: " << endl;
                    cin >> a;
                total = total + a;
                x++;
                amt++;
            }
        }

        int subtract(){
            while(x <= 2){
                cout << "Enter a number to use to add: " << endl;
                    cin >> b;
                total = total - b;
                x++;
                amt++;
            }
        }

        int multiply(){
            while(x <= 2){
                cout << "Enter a number to use to add: " << endl;
                    cin >> c;
                total = total * c;
                x++;
                amt++;
            }
        }

        int divide(){
            while(x <= 2){
                cout << "Enter a number to use to add: " << endl;
                    cin >> d;
                total = total / d;
                x++;
                amt++;
            }
        }
};

int main()
{

cout << "Do you want to add, subtract, multiply or divide? I want to : " << endl;
cin >> ans;

if(ans == "add"){
OperateClass opOper;
opOper.add();
    }

else if (ans == "subtract"){
    OperateClass opOper;
    opOper.subtract();
    }

else if (ans == "multiply"){
    OperateClass opOper;
    opOper.multiply();
    }

else if(ans == "divide"){
    OperateClass opOper;
    opOper.divide();

    }

}

此外，下面这个功能是否足以打印？

void print(){
    cout << "Your total is: " << total << endl;  Where should I call this?

}

Answer 1

所有方法的文本都相同 “输入要用于添加的数字:”