game to refactor for refactor

first step, only aim to work.

it works, but i have not seen the necessaty to use class yet.

my question, why use class?

main.cpp:

#include <iostream>

#include <iostream>

#include "operation.h"

using namespace std;

int main(int argc, const char * argv[]) {

// insert code here...

std::cout << "Hello!\n";

string numberA,numberB,operateType;

std::cout<<"please input numberA:\n";

std::cin >>numberA;

std::cout<<"operate type";

std::cin>>operateType;

std::cout<<"please input numberB:\n";

std::cin>>numberB;

std::cout<<"output:"<<Operation(numberA,numberB,operateType);

//why use class to

return 0;

}

operation.h:

#include <iostream>

using namespace std;

int Operation(string number1, string number2, string operateType);

operation.cpp:

#include "operation.h"

int Operation(string number1, string number2, string operateType){

int result=0;

if(operateType=="+"){

result = atoi(number1.c_str())+atoi(number2.c_str());

}

else if(operateType=="-"){

result = atoi(number1.c_str())-atoi(number2.c_str());

}

else if(operateType=="*"){

result = atoi(number1.c_str())*atoi(number2.c_str());

}

else if(operateType=="/"){

result = atoi(number1.c_str())/atoi(number2.c_str());

}

else{

result =0;

}

return result;

}