PHP Math Exercises: Rounds the specified values with 1 decimal digit precision

Last update on June 02 2025 13:01:28 (UTC/GMT +8 hours)

2. Round Values with 1 Decimal Precision

Write a PHP script which rounds the following values with 1 decimal digit precision.

Sample values :
1.65
1.65
-1.54

Visual Presentation:

Sample Solution:

PHP Code:

<?php
echo round( 1.65, 1, PHP_ROUND_HALF_UP)."\n";   // Rounds up to nearest even number: 1.7
echo round( 1.65, 1, PHP_ROUND_HALF_DOWN)."\n"; // Rounds down to nearest even number: 1.6
echo round(-1.54, 1, PHP_ROUND_HALF_EVEN)."\n"; // Rounds to nearest even number: -1.5
?>

Output:

1.7                                                         
1.6                                                         
-1.5

Explanation:

In the exercise above,

• echo round( 1.65, 1, PHP_ROUND_HALF_UP)."\n";: This line rounds the number 1.65 to 1 decimal place using the 'PHP_ROUND_HALF_UP' rounding mode, which means rounding away from zero. So, 1.65 rounds up to 1.7.
• echo round( 1.65, 1, PHP_ROUND_HALF_DOWN)."\n";: This line rounds the number 1.65 to 1 decimal place using the 'PHP_ROUND_HALF_DOWN' rounding mode, which means rounding towards zero. So, 1.65 rounds down to 1.6.
• echo round(-1.54, 1, PHP_ROUND_HALF_EVEN)."\n";: This line rounds the number -1.54 to 1 decimal place using the 'PHP_ROUND_HALF_EVEN' rounding mode, which means rounding to the nearest even number. So, -1.54 rounds to -1.5.

Flowchart :

For more Practice: Solve these Related Problems:

• Write a PHP script to round a series of floating-point numbers to 1 decimal place using a custom rounding algorithm without using round().
• Write a PHP function that rounds both positive and negative values to 1 decimal digit while ensuring a consistent rounding direction at .5.
• Write a PHP program to round an array of numeric values to 1 decimal place and then output the difference between the original and rounded values.
• Write a PHP script to simulate banker's rounding (round half to even) for numbers with 1 decimal digit precision and display the results.

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