Task Three - Simple Maths - PHP Tutorial

<?php

// ===== INPUT ==============================
echo "\n\nPlease enter a number ... ";
$N1 = fgets(STDIN);

echo "\n\nPlease enter a number ... ";
$N2 = fgets(STDIN);
// ==========================================

// ===== PROCESS ============================
$output = $N1 + $N2;
// ==========================================

// ===== OUTPUT =============================
echo "\n\nThe answer is $output.\n\n\n";
// ==========================================

?>

Code

Explanation

echo "\n\nPlease enter a number ... ";

echo displays the text inside the double quotes. "\n" causes a new line to be started.

$N1 = fgets(STDIN);

fgets() fetches a line of text from the keyboard (until the Enter key is pressed).

$N1 is a variable (pigeon hole) where a number can be stored. (You could type text here but the result would not be useful.)

$N2 = fgets(STDIN);

fgets() fetches a line of text from the keyboard (until the Enter key is pressed).

$N2 is a variable (pigeon hole) where a number can be stored. (You could type text here but the result would not be useful.)

$output = $N1 + $N2;

Then the addition is carried out and the result assigned to $output.

echo "\n\nThe answer is $output.\n\n\n";

echo displays the following

• two blank lines
• "The answer is"
• The data held in $output
• A period (full stop)
• Three more blank lines

Arithmetic Operators