Simple Calculator Program in PHP — Tutorials Class

Calculator in PHP using If-Else Statement

PHP (Hypertext Preprocessor) is an open-source & server-side scripting language designed specifically for web development, where the scripts are executed on the server. It is free to download and use & can be easily embedded with HTML files. We can also write HTML codes in a PHP file. PHP calculator is used for performing basic mathematical operations like Addition, subtraction, multiplication, and division. In this article, we will see how to design the Calculator In PHP to perform basic arithmetic operations. For this, we will be using PHP, HTML, & JavaScript.

A simple calculator can be made using a PHP program that is able to add, subtract, multiply and divide, two operands entered by the user. The if-else statement will be used to create a calculator.

Approach: The following approach will be used to create the basic calculator:

We will declare two local variables say num1 and num2 for two numeric values. Then, we will enter the choice(Addition, subtraction, multiplication, or division). Then, it takes two numbers, num1, and num2 for further calculation. With the help of the if-else statement, it will jump to an operator selected by the user. Using the HTML table created the design where variables are holding the input field and the rest of them are filled with input buttons. Now, with the help of function res(), it displays the respective value of the button to the input field every time we click the button. The ans() function is used to set the value pressed from the keyboard to the same input field. All the calculations of the numbers entered can be done by both the “Enter” key and also with the help of the “=” button. The calculate() function will do the calculation with math.evaluate() function and then displays the final result to the input field. The clear_input() function is used whose work is to clear the input field.

Example: This example illustrates the PHP Calculator by implementing the basic if-else statement.

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jkuip / calculator.php

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< title >Calculator

< link href =" https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css " rel =" stylesheet " >

// If the submit button has been pressed

if (isset( $ _POST [ ‘submit’ ]))

// Check number values

if (is_numeric( $ _POST [ ‘number1’ ]) && is_numeric( $ _POST [ ‘number2’ ]))

// Calculate total

if ( $ _POST [ ‘operation’ ] == ‘plus’ )

$ total = $ _POST [ ‘number1’ ] + $ _POST [ ‘number2’ ];

>

if ( $ _POST [ ‘operation’ ] == ‘minus’ )

$ total = $ _POST [ ‘number1’ ] — $ _POST [ ‘number2’ ];

>

if ( $ _POST [ ‘operation’ ] == ‘times’ )

$ total = $ _POST [ ‘number1’ ] * $ _POST [ ‘number2’ ];

>

if ( $ _POST [ ‘operation’ ] == ‘divided by’ )

$ total = $ _POST [ ‘number1’ ] / $ _POST [ ‘number2’ ];

>

// Print total to the browser

echo » < $ _POST [ 'number1' ]> < $ _POST [ 'operation' ]> < $ _POST [ 'number2' ]>equals «;

> else

// Print error message to the browser

echo ‘Numeric values are required’ ;

>

>

?>

< input name =" number1 " type =" text " class =" form-control " style =" width: 150px; display: inline "/>

< option value =" plus " >Plus

< option value =" minus " >Minus

< option value =" times " >Times

< option value =" divided by " >Divided By

< input name =" number2 " type =" text " class =" form-control " style =" width: 150px; display: inline "/>

< input name =" submit " type =" submit " value =" Calculate " class =" btn btn-primary "/>

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Write a simple calculator program in PHP using switch case

You need to write a simple calculator program in PHP using switch case.

View Solution/Program

    > ?>  
PHP - Simple Calculator Program
 
 
 First Number 
 
 Second Number 
 
 Result 
    
 
  

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Simple Calculator Using PHP

This is a simple calculator that can perform the simple arithmetic tasks (+, -, * and /).

Write a simple calculator program in PHP using if-else statement

HTML Code for Simple Calculator

PHP Code for Simple Calculator

We are using Else-If statement for performing the functions.

Download Code – Simplecalculator

Write a simple calculator program in PHP using the switch statement

Operations on calculator

Following operations will perform on the given calculator;

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Write a PHP program to make a calculator class that will accept two values as a parameter, then perform the operation of addition, multiplication, subtraction, and division.

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Topic Covered:

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