Simple Calculator Using C++ Programming Language

Calculator:  

A device which performs arithmetic operations and simple calculator is one which performs addition , subtraction , multiplication and division mathematical operation

• Addition    
• Subtraction
• Multiplication 
• Division 

First of all you have to know that how a simple calculator works. Simple calculator means that it can perform basic mathematical operations like summation , subtraction , multiplication and division.Now there are four operations and all that you have to know is the common thing between these mathematical operations.In all these operations , calculator take three values from the user and shows the result according to operation you defined like summation etc.Three values  means two numbers and mathematical operation.

simple calculator

Algorithm:

"For all above operations , need to check which mathematical operation is going to be performed."

In above all operation , user have to enter two numbers , so two variables with type double. For mathematical operation like + , - , * , / requires variable of type char . For the result of two numbers also requires one variable of type double.

Now if you want to check operation , i am going to use switch statement , if you don't know about this statement , then click on it, it is very easy.

Now in order to perform operations again and again , there is no need to go while compile and execute your code every time. For this i am using do while loop, if you don't know about this loop click on it, it is very easy or visit my C++ lectures page.

Recommended Articles:

• if statement
• do while

Program code:

Note: Program code is very easy, i used comments with the every section so that you can under stand quickly

#include<iostream>

#include<conio.h>

using namespace std;

int main ()

{

double num1 , num2 ;     // input variables

char operation ;        // for mathematical operator

char redo ;             // for next calculation

double ans=0 ;         //  Result

cout<<endl<<endl;   // endl ==> next line

cout<<"********************************************"<<endl;

cout<<"             Simple Calculator              "<<endl;

cout<<"********************************************"<<endl<<endl<<endl;

do

{

   cout<<"  Enter First number  =   ";

   cin>>  num1;

   cout<<endl;

   

cout<<"  Enter operation +  , - , * , /  =   ";

   cin >> operation;

   cout<<endl;

   cout<<"  Enter Second number  =  ";

   cin>>  num2;

   cout<<endl<<endl;

   // For different mathematical operations

   switch(operation)

   {

   //Addition

   case '+':

    ans = num1 + num2 ;

    cout<<"  Addition of two numbers is  =   "<< ans ;

    break;

   //Subtraction

   case '-':

    ans = num1 - num2 ;

    cout<< "  Subtraction of two numbers is  =  "<< ans;

    break;

        //Multiplication

   case '*':

   ans = num1 * num2 ;

   cout<<"  Multiplication of Two numbers is  =  "<< ans;

   break;

   //Division

   case '/':

   ans = num1 / num2 ;

   cout<<"  Division of two numbers is  =  "<< ans ;

   break;

   //other than + - * /

   default:

  cout<<endl;

  cout<< "  invalid operation  " << endl;

  }

  

    cout<<endl<<endl<<"********************************************"<<endl<<endl;

cout<<endl<<endl<< "  Enter y or Y for next Calculation =  ";

    cin>>redo;

    cout<<endl<<endl;

        

    } while(redo == 'y' || redo == 'Y');

    

getch();

}

Output:

The output of above program will be like this

Click on image to enlarge it.

Hope that you will find this helpful.