small calculator

calculator.cpp

#include <iostream>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
char ch,cont;
double a,b,c,d,e;
do{

cout<<"Choose Which Calculation Do You Want To Make:"<<endl
<<"a.sum(+))"<<endl
<<"b.subtraction(-)"<<endl
<<"c.multiplication(x)"<<endl
<<"d.division(:)"<<endl;
cin>>ch;

switch(ch){
	case 'a' :
		cout<<"you choosed sum please enter 2 number"<<endl;
		cout<<"first number: ";
		cin>>a;
		cout<<" second number: ";
		cin>>b;
		c=a+b;
		cout<<"the answer is: "<<c<<endl;
		break;

    case 'b' :
    	cout<<"you choosed subtraction please enter 2 number"<<endl;
		cout<<"first number: ";
		cin>>a;
		cout<<" second number: ";
		cin>>b;
		c=a-b;
				cout<<"the answer is: "<<c<<endl;

		break;
		
		case 'c' :
			cout<<"you choosed multiplication please enter 2 number"<<endl;
		cout<<"first number: ";
		cin>>a;
		cout<<" second number: ";
		cin>>b;
			c=a*b;
		cout<<"the answer is: "<<c<<endl;
				break;

case 'd' :
		cout<<"you choosed division please enter 2 number"<<endl;
	cout<<"first number: ";
		cin>>a;
		cout<<" second number: ";
		cin>>b;
			if (a<0 || a>0 || b>0 ||0>b)
{

	c=a/b;
		cout<<"the answer is: "<<c<<endl;
			break;
}
		else 
	cout<<"you cannot use 0"<<endl;
		break;
default :
	cout<<"something went wrong please re-open the app"<<endl;
	
}
cout<<"do you wanna continou[Y/N]"<<endl;
cin>>cont;
}while (cont=='y'|cont=='Y');
	return 0;
}