C++ Program to Make a Simple Calculator

Last Updated : 15 Oct, 2024

A simple calculator is a device used to perform basic arithmetic operations such as addition, subtraction, multiplication, and division. It makes arithmetic calculations easier and faster. In this article, we will learn how to code a simple calculator using C++.

Examples

Input: Enter an operator (+, -, *, /): *
Enter two numbers: 10 5
Output: Result: 50
Explanation: Chosen operation is addition, so 10 * 5 = 50

There are two different ways to make simple calculator program in C++:

Table of Content

Using Switch Statement

In C++, the switch statement allows us to define different cases that will be executed based on the value of a given variable. We can use it to define four cases for addition, subtraction, multiplication, and division which will be executed based on the value that user input to select the operation type.

Code Implementation

C++

// C++ Program to make a Simple Calculator using // switch-case statements #include <bits/stdc++.h> using namespace std;  int main() {     char op;     double a, b, res;      // Read the operator     cout << "Enter an operator (+, -, *, /): ";     cin >> op;      // Read the two numbers     cout << "Enter two numbers: ";     cin >> a >> b;      // Define all four operations in the corresponding     // switch-case     switch (op) {     case '+':         res = a + b;         break;     case '-':         res = a - b;         break;     case '*':         res = a * b;         break;     case '/':         res = a / b;         break;     default:         cout << "Error! Operator is not correct";         res = -DBL_MAX;     } 	   	// Printing the result     if (res != -DBL_MAX)         cout << "Result: " << res;     return 0; }

Output

Enter an operator (+, -, *, /): * Enter two numbers: 10 5 Result: 50

Note: The break statement in each switch case is used to come out of the switch statement when same case is matched and executed. Otherwise, all the cases after the matching case will be executed.

Using if-else Statement

In C++, the if-else if ladder can also be used to create a simple calculator. Here, we define all the cases inside the corresponding if and else-if condition block and again by matching the given user input, we will perform the corresponding arithmetic operation. But the syntax is more complex in comparison to a switch statement.

Code Implementation

C++

// C++ Program to implement a Simple Calculator // using if-else statements #include <bits/stdc++.h> using namespace std;  int main() {     char op;     double a, b, res;      // Read the operator     cout << "Enter an operator (+, -, *, /): ";     cin >> op;      // Read the two numbers     cout << "Enter two numbers: ";     cin >> a >> b;      // Perform the operation corresponding to the     //  given operator     if (op == '+')         res = a + b;     else if (op == '-')         res = a - b;     else if (op == '*')         res = a * b;     else if (op == '/')         res = a / b;     else {         cout << "Error! Operator is not correct";         res = -DBL_MAX;     }      if (res != -DBL_MAX)         cout << "Result: " << res;     return 0; }

Output

Enter an operator (+, -, *, /): * Enter two numbers: 10 5 Result: 50

Time Complexity: O(1)
Auxiliary Space: O(1)

C++ program for Complex Number Calculator

MinalJain

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C++ Program to Make a Simple Calculator

Using Switch Statement

Code Implementation

Using if-else Statement

Code Implementation

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