编辑：添加了“添加”类，不小心忘记了。如何将类分成不同的文件？我了解类如何工作以及如何制作对象和类似的东西。但是，我在将类放入不同文件的过程中发现了一些混乱。非常感谢您的帮助！另外，我使用 CodeBlocks 作为 IDE。到目前为止，这是我的理解：
- 创建新类，CB 给你一个“.h”和一个新的“.cpp”。
- 源文件开头的“Classname::Classname”是一个作用域解析运算符。
- 您在主源文件中使用“#include classname.h”来导入其内容。
- 您可以使用已声明的对象从“main”调用函数。
到目前为止，这是我的理解，但我只是对如何实现它感到困惑。我创建了一个简单的计算器，所有类都在一个源文件中。它工作得很好，我想我对此感到非常自豪:) 我知道有很多更简单的方法可以制作这样的东西，但我使用类和对象只是为了练习。这是我的计算器代码。另外，我真的为这篇长文道歉：/谢谢，如果你读了这么多，特别感谢你能帮我一点忙！
这是我在一个源文件中的代码：
#include <iostream>
using namespace std;
class Addition {
public:
float add (float x, float y) {
float sum;
sum=x+y;
return sum;
}
};
class Subtraction {
public:
float subtract (float x, float y) {
float dif;
dif=x-y;
return dif;
}
};
class Multiplication {
public:
float multiply (float x, float y) {
float prod;
prod=x*y;
return prod;
}
};
class Division {
public:
float divide (float x, float y) {
float quot;
quot=x/y;
return quot;
}
};
int op;
char cont;
int main()
{
do {
cout<<"Welcome to C++ Calculator v2!"<<endl;
cout<<"Select the number for which operation you want to use: "<<endl;
cout<<"1-Addition"<<endl;
cout<<"2-Subtraction"<<endl;
cout<<"3-Mutliplication"<<endl;
cout<<"4-Division"<<endl;
cin>>op;
if (op==1) {
float num1;
float num2;
Addition addobj;
cout<<"You have chosen Addition!"<<endl;
cout<<"Enter the first number you want to add: "<<endl;
cin>>num1;
cout<<"Enter the second number you wat to add: "<<endl;
cin>>num2;
float ans=addobj.add(num1, num2);
cout<<"The sum is "<<ans<<endl;
cout<<"Do you wish to continue? Y/N"<<endl;
cin>>cont;
}
if (op==2) {
float num1;
float num2;
Subtraction subobj;
cout<<"You have chosen Subtraction!"<<endl;
cout<<"Enter the first number you want to subtract: "<<endl;
cin>>num1;
cout<<"Enter the second number you want to subtract: "<<endl;
cin>>num2;
float ans=subobj.subtract(num1, num2);
cout<<"The difference is "<<ans<<endl;
cout<<"Do you wish to continue? Y/N"<<endl;
cin>>cont;
}
if (op==3) {
float num1;
float num2;
Multiplication multobj;
cout<<"You have chosen Multiplication!"<<endl;
cout<<"Enter the first number you want to multiply: "<<endl;
cin>>num1;
cout<<"Enter the second number you want to multiply: "<<endl;
cin>>num2;
float ans=multobj.multiply(num1, num2);
cout<<"The product is "<<ans<<endl;
cout<<"Do you wish to continue? Y/N"<<endl;
cin>>cont;
}
if (op==4) {
float num1;
float num2;
Division divobj;
cout<<"You have chosen Division!"<<endl;
cout<<"Enter the first number you want to divide: "<<endl;
cin>>num1;
cout<<"Enter the second number you want to divide: "<<endl;
cin>>num2;
float ans=divobj.divide(num1, num2);
cout<<"The quotient is "<<ans<<endl;
cout<<"Do you wish to continue? Y/N"<<endl;
cin>>cont;
}
} while (cont=='Y'||cont=='y');
if (cont=='N'||'n') {
cout<<"Thanks for using my program, goodbye!"<<endl;
}
return 0;
}