Write a C++ Program that simulates a basic calculator using functions which perf

Question

Write a C++ Program that simulates a basic calculator using functions which performs the operations of Addition, Subtraction, multiplication, and Division. ( make sure you cover the case to avoid division by a zero)

1)Display a menu for list of operations that can be calculated and get the input from user about his choice of calculation.

2) Based on user choice of operation, take the input of number/numbers from user. Assume all input values are of type double.

3)Calculations must be implemented using functions which return a double value.

4)Result of the calculation should be displayed on the screen

Explanation / Answer

#include<iostream.h>
#include<conio.h>

double add(double a, double b)
{
   return a+b;
}

double sub(double a, double b)
{
   return a-b;
}

double mult(double a, double b)
{
   return a*b;
}

double div(double a, double b)
{
   if(b==0)
       return -1;
   return a/b;
}

void main()
{
   clrscr();
   double a, b;
   int ch;  
   cout<<"1. Addition"<<endl;
   cout<<"2. Subtraction"<<endl;
   cout<<"3.Multiplication"<<endl;
   cout<<"4.Division"<<endl;
   cout<<"Enter your choice: ";
   cin>>ch;
   cout<<"Enter value 1:";
   cin>>a;
   cout<<"Enter value 2:";
   cin>>b;
   if(ch==4 && b == 0)
       cout<<"Error. Division by 0";
   else{
       if(ch==1)
           cout<<"Result: "<<add(a,b);
       else if(ch==2)
           cout<<"Result: "<<sub(a,b);
       else if(ch==3)
           cout<<"Result: "<<mult(a,b);
       else if(ch==4)
           cout<<"Result: "<<div(a,b);
       else
           cout<<"Invalid choice";
   }
   getch();
}

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