Q. C++ program to make a simple calculator using switch case.

Here you will find an algorithm and program in C++ programming language to make a simple calculator. First let us understand what is calculator?

Explanation : A calculator is used to make mathematical calculations. In this program we will create a simple calculator that can perform an arithmetic operation (+, -, *, /).

Calculator Program Algorithm

START
Step 1 : Initialise the two numbers.
Step 2 : Ask the user to enter an option by giving six options.
Step 3 : After getting the option from the user write if conditions for every operation based on the option.
Step 4 : Perform the respective operation.
Step 5 : Print the result.
STOP

C++ Program to Make a Simple Calculator

#include <bits/stdc++.h>
using namespace std;
int main()
{
  char ch;
  float num1, num2;
  cout << "Enter an operator (+, -, *, /):  ";
  cin >> ch;
  cout << "Enter two operands: ";
  cin >> num1 >> num2;
  switch(ch)
  {
    case '+':
      cout << num1+num2;
      break;
    case '-':
      cout << num1-num2;
      break;
    case '*':
      cout << num1*num2;
      break;
    case '/':
      cout << num1/num2;
      break;
    default:
      // If the operator is other than +, -, * or /, error message is shown
      cout << "Error! operator is not correct";
      break;
  }
  return 0;
}

Output

Enter an operator (+, -, *, /): *
Enter two operands: 8 6
8.0 * 6.0 = 48.0