Calculator Program in C++

A calculator is a portable device that helps to perform simple mathematical calculations in our daily lives such as addition, subtraction, division, multiplication, etc. Some of the scientific calculators are used to perform complex calculation more easily like square root, function, exponential operations, logarithm, trigonometric function and hyperbolic function, etc. In this section, we will create calculator program in C++ using function and do-while loop.

Using Function

Lets' create a calculator program in C++ using the function and Switch statement.

#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
void add();
void sub();
void multi();
void division();
void sqr();
void srt();
void exit();
void main()
{
clrscr();
int opr;
// display different operation of the calculator
do
{
cout << "Select any operation from the C++ Calculator"
     "\n1 = Addition"
     "\n2 = Subtraction"
     "\n3 = Multiplication"
     "\n4 = Division"
     "\n5 = Square"
     "\n6 = Square Root"
     "\n7 = Exit"
     "\n \n Make a choice: ";
     cin >> opr;

   switch (opr)
     {
     case 1:
	add();   // call add() function to find the Addition
	break;
	case 2:
	sub();   // call sub() function to find the subtraction
	break;
	case 3:
	multi(); // call multi() function to find the multiplication
	break;
	case 4:
	division(); // call division() function to find the division
	break;
	case 5:
	sqr(); // call sqr() function to find the square of a number
	break;
	case 6:
	srt(); // call srt() function to find the Square Root of the given number
	break;
	case 7:
	exit(0);   // terminate the program
	break;
	default:
	cout <<"Something is wrong..!!";
	break;
	}
	cout <<" \n------------------------------\n";
	}while(opr != 7);
	getch();
	}

void add()
{
int n, sum = 0, i, number;
cout <<"How many numbers you want to add: ";
cin >> n;
cout << "Please enter the number one by one: \n";
for (i = 1; i <= n; i++)
{
cin >> number;
sum = sum + number;
}
cout << "\n Sum of the numbers = "<< sum;
}
void sub()
{
int num1, num2, z;
cout <<" \n Enter the First number = ";
cin >> num1;
cout << "\n Enter the Second number = ";
cin >> num2;
z = num1 - num2;
cout <<"\n Subtraction of the number = " << z;
}
void multi()
{
int num1, num2, mul;
cout <<" \n Enter the First number = ";
cin >> num1;
cout << "\n Enter the Second number = ";
cin >> num2;
mul = num1 * num2;
cout <<"\n Multiplication of two numbers = " << mul;
}
void division()
{
int num1, num2, div = 0;
cout <<" \n Enter the First number = ";
cin >> num1;
cout << "\n Enter the Second number = ";
cin >> num2;
while ( num2 == 0)
     {
     cout << "\n Divisor canot be zero"
	     "\n Please enter the divisor once again: ";
	     cin >> num2;
	     }
div = num1 / num2;
cout <<"\n Division of two numbers = " << div;
}
void sqr()
{
int num1;
float sq;
cout <<" \n Enter a number to find the Square: ";
cin >> num1;
sq = num1 * num1;
cout <<" \n Square of " << num1<< " is : "<< sq;
}
void srt()
{
float q;
int num1;
cout << "\n Enter the number to find the Square Root:";
cin >> num1;
q = sqrt(num1);
cout <<" \n Square Root of " << num1<< " is : "<< q;
}

Output:

Using do-while Loop

Write a Calculator Program in the C++ using the do while and Switch Statement.

#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void main()
{
clrscr();
int opr;
int num1, num2, x;
// display different operation of the calculator
do
{
cout << "Select an operation to perform a simple calculation in C++ Calculator"
     "\n1 = Addition"
     "\n2 = Subtraction"
     "\n3 = Multiplication"
     "\n4 = Division"
     "\n5 = Square"
     "\n6 = Exit"
     "\n \n Make a choice: ";
     cin >> opr;
   switch (opr)
     {
     // for addition operation in calculator
     case 1:
     cout << "You have selected the Addition Operation.";
     cout << "\n Please enter the two number: \n";
     cin >> num1 >> num2;
     x = num1 + num2;
     cout << "Sum of two number = " << x;
     break;
     // for subtraction operation in calculator
     case 2:
     cout << "You have selected the Subtraction Operation.";
     cout << "\n Please enter the two number: \n";
     cin >> num1 >> num2;
     x = num1 - num2;
     cout << "Subtraction of two number = " << x;
     break;
     // for multiplication operation in calculator
     case 3:
     cout << "You have selected the Multiplication Operation.";
     cout << "\n Please enter the two number: \n";
     cin >> num1 >> num2;
     x = num1 * num2;
     cout << "Product of two number = " << x;
     break;
     // for division operation in calculator
     case 4:
     cout << "You have selected the Division Operation.";
     cout << "\n Please enter the two number; \n";
     cin >> num1 >> num2;
     // while loop checks for divisor whether it is zero
     while ( num2 == 0)
     {
     cout << "\n Divisor cannot be zero"
	     "\n Please enter the divisor once again: ";
	     cin >> num2;
	     }
     x = num1 / num2;
     cout << "\n Quotient = " << x;
     break;
     // to square a number in calculator
     case 5:
     cout << "You have selected the Square Operation.";
      cout << "\n Please enter any number: \n";
     cin >> num1;
     x = num1 * num1;
     cout << "Square is = " << x;
     break;
     case 6: exit(0);  // terminate the program
     break;
     default: cout << "\n Something went wrong..!!";
     break;
     }
     cout << "\n----------------------------------------- \n";
     } while(opr != 6);
     getch();
     }

Output: