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Question

類

我無法選擇的功能從class OperateClass

它要求用戶調用函數「你想加，減，乘或除我想：」（主）。無論我放什麼，它都轉到功能int add。我究竟做錯了什麼？

#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(); 

    } 

} 

另外，下面的功能是否足以打印？

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

} 

Answer 1

你必須爲所有方法"Enter a number to use to add: "