CPP program

#include<iostream>
using namespace std;
class newHelloWorld{
	private: 
		int op1, op2, result;
		char op;		
	public:
		newHelloWorld(void){
			//Default Constructor
		}

		
		void input(void){
			cout<<"\nEnter first operand : ";
			cin>>op1;
			cout<<"+ (for addition), \n- (for subtraction), \n* (for multiplication), \n/ (for division) and\n% (for modulus) \nEnter (from above) operation: ";
			cin>>op; 
			cout<<"Enter second operand: ";
			cin>>op2;
		}
		
		void operation(){			
			switch(op){
				case '+': result = op1 + op2;
					break;
				case '-': result = op1 - op2;
					break;
				case '*': result = op1 * op2;
					break;
				case '/': if(op2!=0)
						result = op1/op2;
					else{
						cout<<"Invalid value for second operand. Quitting\n";
						exit(1);
					}
					break;
				case '%': if(op2!=0)
						result = op1%op2;
					else{
						cout<<"Invalid value for second operand. Quitting\n";
						exit(1);
					}
					break;
				default: cout<<"\nAbnormal termination due to wrong input of operation\n";
					exit(1);
			}
		}
		void display(void){			
			cout<<op1<<" "<<op<<" "<<op2<<" ="<<" "<<result<<"\n";
		}
};


int main(void){
	newHelloWorld hwobj;
	hwobj.input();
	hwobj.operation();
	hwobj.display();
}