Basic Math Operations

Numbers

You already know how to use the echo function to output text. But what about numbers and mathematical calculations?

You can also use echo to display these. When you want to output the result of a mathematical expression, there's no need to use quotes (" " or ' '). Simply write the expression directly inside echo, and it will be evaluated and displayed on the screen.

main.php


              12345
            
<?php
echo 'Two';   // This outputs the string "Two"
echo '2';     // This outputs the string "2"
echo 2;       // This outputs the number 2
?>

If you print a number and a string to the console, they will look the same, which is something they have in common. However, there are things we can do with numbers that we can't do with strings, and vice versa. For instance, we can apply mathematical operations to numbers.

Math Operations

Almost no program can do without mathematical calculations, so PHP supports the following mathematical operations:

The code below performs basic arithmetic operations on different numbers and outputs the results to the screen. Output the result of adding 5 and 3:

main.php


              123
            
<?php
echo 5 + 3;  // Outputs: 8
?>

Output the result of subtracting 7 from 10:

main.php


              123
            
<?php
echo 10 - 7;  // Outputs: 3
?>

Output the result of dividing 15 by 3:

main.php


              123
            
<?php
echo 15 / 3;  // Outputs: 5
?>

Output the result of multiplying 4 by 6:

main.php


              123
            
<?php
echo 4 * 6;  // Outputs: 24
?>

Output the remainder of dividing 17 by 5:

main.php


              123
            
<?php
echo 17 % 5;  // Outputs: 2
?>

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Section 1. Chapitre 4

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Numbers

You already know how to use the echo function to output text. But what about numbers and mathematical calculations?

You can also use echo to display these. When you want to output the result of a mathematical expression, there's no need to use quotes (" " or ' '). Simply write the expression directly inside echo, and it will be evaluated and displayed on the screen.

main.php


              12345
            
<?php
echo 'Two';   // This outputs the string "Two"
echo '2';     // This outputs the string "2"
echo 2;       // This outputs the number 2
?>

If you print a number and a string to the console, they will look the same, which is something they have in common. However, there are things we can do with numbers that we can't do with strings, and vice versa. For instance, we can apply mathematical operations to numbers.

Math Operations

Almost no program can do without mathematical calculations, so PHP supports the following mathematical operations:

The code below performs basic arithmetic operations on different numbers and outputs the results to the screen. Output the result of adding 5 and 3:

main.php


              123
            
<?php
echo 5 + 3;  // Outputs: 8
?>

Output the result of subtracting 7 from 10:

main.php


              123
            
<?php
echo 10 - 7;  // Outputs: 3
?>

Output the result of dividing 15 by 3:

main.php


              123
            
<?php
echo 15 / 3;  // Outputs: 5
?>

Output the result of multiplying 4 by 6:

main.php


              123
            
<?php
echo 4 * 6;  // Outputs: 24
?>

Output the remainder of dividing 17 by 5:

main.php


              123
            
<?php
echo 17 % 5;  // Outputs: 2
?>

Tâche

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Here's your assignment: compute the following and print the outcome: 1512 divided by 27.

Solution

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Section 1. Chapitre 4

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