#include<iostream>
#include<cmath>
#include<iomanip>

using namespace std;

int main()
{
	char  operations;
	float num1 , num2 , m , s , dvd , dvr , sum , diff , Qnt , r;
	diff = m - s;
	Qnt  = dvd / dvr;
	r    = Qnt;



	cout<<"CpE 112 - Second Examination" << endl << endl;
	cout<<"Developed by: William John R. Elaco"  << endl;
	cout<<"Station No.: 33" << endl << endl;
	cout<<"MENU:" << endl << endl << endl;
	cout<< '\t' <<"a. ADDITION" << endl;
	cout<< '\t' <<"b. SUBTRACTION" <<endl;
	cout<< '\t' <<"c. DIVISION" << endl;

	cin >> operations;
	switch (operations)
			{
				case 'a':
				cout<<"Addition:" <<endl;
				cin >> num1;
				cin >> num2;
				sum  = num1 + num2;
				cout<< sum;
				break;

				case 'b':
				cout<<"Subtraction:" << endl << endl;
				cout<<"Input Minuend:" << endl;
				cin >> m;
				cout<<"Input Subtrahend:" << endl;
				cin >> s;
				diff = m - s;
				cout<< "Answer:" <<endl;
				cout<< diff;
				if (m < s)
				{
					cout<<"ERROR! Minuend must be greater than subtrahend." << endl;
					cout<<"Please input valid numbers again!";
				}
				break;


				case 'c':
				cout<<"Division:" << endl;
				cout<<"Input Dividend:" << endl;
				cin >> dvd;
				cout<<"Input Divisor:" << endl;
				cin >> dvr;
				Qnt = dvd / dvr;
				cout<<"Answer:" << endl;
				cout<< Qnt;
				break;
			}


}