ماشین حساب به زبان ++c

این هم یه ماشین حساب ساده به زبان سی پلاس پلاس

//SoftAfzar.Net
#include <iostream>
using namespace std;
int main()
{
	long a,b,c,d,e,f,g,h,i,j,k,l,m,n;
	cout<<"1)Add"<<endl;
	cout<<"2)Subtract"<<endl;
	cout<<"3)Multiply"<<endl;
	cout<<"4)Divide"<<endl;
	cin >>a;
	if (a==1)
	{
		cout<<"Enter a number to add.";
		cin >>b;
		cout<<"Enter a second number to add.";
		cin >>c;
			d=b+c;
			cout<<d<<endl;
	}
	if (a==2)
	{
		cout<<"Enter a number to subtract.";
		cin >>e;
		cout<<"Enter a second number to subtract.";
		cin >>f;
			g=e-f;
			cout<<g<<endl;
	}
		if (a==3)
	{
		cout<<"Enter a number to multiply.";
		cin >>h;
		cout<<"Enter a second number to multiply.";
		cin >>i;
			j=h*i;
			cout<<j<<endl;
	}
	
	{
		if (a==4)
		{
		cout<<"Enter a number to divide.";
		cin >>k;
		cout<<"Enter a second number to divide.";
		cin >>l;
			m=l/k;
			if (k > l)
			{
				cout<<"Error #";
			}
			cout<<m<<endl;
			

	}
		cout<<"Thank you for using the Mr.PoO's Calculator! Copyright (c) Mr.PoO Inc.Press any key and enter to exit.";
		cin >>n;
		if (n==' ')
		{
			return 0;
		}		
}

}