calculator.cpp.cpp

#include <iostream>
#include <math.h>
using namespace std;
 
// Class calculator 
class Calculator
{
   float a, b;
public:
   
    // Function to take input
    // from user
    void result() 
    {
        cout << "Enter First Number: ";    
        cin >> a;
        cout << "Enter Second Number: ";   
        cin >> b;
    }
   
    // Function to add two numbers
    float add() 
    {
        return a + b;
    }
   
    // Function to subtract two numbers
    float sub() 
    {
        return a - b;
    }
   
    // Function to multiply two numbers
    float mul() 
    {
        return a * b;
    }
   
    // Function to divide two numbers
    float div() 
    {
        if (b == 0) 
        {
            cout << "Division By Zero" << 
                     endl;
            return INFINITY;
        }
        else
        {
            return a / b;
        }
    }
};
 
// Driver code
int main() 
{
    int ch;
    Calculator c; 
    cout << "Enter 1 to Add 2 Numbers" << 
            "\nEnter 2 to Subtract 2 Numbers" << 
            "\nEnter 3 to Multiply 2 Numbers" << 
            "\nEnter 4 to Divide 2 Numbers" << 
            "\nEnter 0 To Exit";
         
    do
    {
        cout << "\nEnter Choice: ";
        cin >> ch;
        switch (ch)
        {
        case 1:
             
            // result function invoked
            c.result();     
             
            // add function to calculate sum
            cout << "Result: " << 
                     c.add() << endl; 
            break;
        case 2:
             
            // sub function to calculate 
            // difference
            c.result();
            cout << "Result: " << 
                     c.sub() << endl; 
            break;
        case 3:
            c.result();
             
            // mul function to calculate product
            cout << "Result: " << 
                     c.mul() << endl; 
            break;
        case 4:
            c.result();
             
            // div function to calculate division
            cout << "Result: " << 
                     c.div() << endl; 
            break;
        }
         
    } while (ch >= 1 && ch <= 4);
     
    return 0;
}