Float type and precision in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a float variable with value 3.14.

PHP

<?php
$pi = [1];
echo $pi;
?>

Drag options to blanks, or click blank then click option'

A3.14

B"3.14"

C3,14

Dfloat(3.14)

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the number makes it a string, not a float.

Using a comma instead of a dot for decimal point.

The correct way to assign a float value is using a number with a decimal point like 3.14.

2fill in blank

medium

Complete the code to print the float value with 2 decimal places.

PHP

<?php
$number = 3.14159;
echo number_format([1], 2);
?>

Drag options to blanks, or click blank then click option'

Anumber

B$number

C3.14159

D"3.14159"

Attempts:

3 left

💡 Hint

Common Mistakes

Using the variable name without the dollar sign.

Passing a string instead of the variable.

Use the variable $number inside number_format to format the float.

3fill in blank

hard

Fix the error in the code to correctly compare two float values.

PHP

<?php
$a = 0.1 + 0.2;
$b = 0.3;
if (abs($a - $b) < [1]) {
    echo "Equal";
} else {
    echo "Not equal";
}
?>

Drag options to blanks, or click blank then click option'

A0.0001

B0.1

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Comparing floats directly with ==.

Using a large tolerance like 1 which is too big.

Because of floating point precision, we check if the difference is less than a small number like 0.0001 to consider them equal.

4fill in blank

hard

Fill both blanks to create an array of floats and sum them.

PHP

<?php
$values = array([1], [2]);
$sum = array_sum($values);
echo $sum;
?>

Drag options to blanks, or click blank then click option'

A1.5

B2

C2.5

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using integers instead of floats.

Mixing up the order of numbers.

The array contains floats 1.5 and 2.5. Their sum is 4.0.

5fill in blank

hard

Fill all three blanks to create a float, round it, and print the result.

PHP

<?php
$value = [1];
$rounded = round([2], [3]);
echo $rounded;
?>

Drag options to blanks, or click blank then click option'

A3.6789

B$value

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the float directly in round without assigning.

Forgetting to specify the number of decimals.

Assign 3.6789 to $value, then round $value to 2 decimal places.