PHP Exercises: Sum of all numerical values embedded in a sentence

Last update on April 19 2025 11:50:27 (UTC/GMT +8 hours)

69. Sum of Numerical Values in Sentence

Write a PHP program to sum of all numerical values (positive integers) embedded in a sentence.
Sentences with positive integers are given over multiple lines. Each line is a character string containing one-byte alphanumeric characters, symbols, spaces, or an empty line. However the input is 80 characters or less per line and the sum is 10,000 or less.

Sample Solution:

PHP Code:

<?php
// Initialize a variable to store the sum of numeric values
$sum = 0;

// Read a line of input and remove trailing whitespaces
$s = rtrim(fgets(STDIN));

// Use a regular expression to find all numeric values in the input string
if (preg_match_all('/[0-9]+/', $s, $a)) {
    // Iterate through the matched numeric values and add them to the sum
    foreach ($a[0] as $v) {
        $sum += (int) $v;
    }
}

// Output the sum of the numeric values
echo "Sum of the numeric values: " . $sum . PHP_EOL;

?>

Explanation:

Initialize Sum Variable:

$sum is set to 0 to store the sum of numeric values found in the input.

Read Input and Remove Trailing Whitespaces:

A line of input is read from standard input, and rtrim removes any trailing whitespaces.

Extract Numeric Values Using Regular Expression:

preg_match_all('/[0-9]+/', $s, $a) is used to find all sequences of digits in the input string $s.
If any numeric values are found, they are stored in $a[0].

Calculate Sum of Numeric Values:

Each numeric value in $a[0] is converted to an integer and added to $sum.

Output the Sum:

The final sum of all numeric values in the input is printed, prefixed with "Sum of the numeric values:".

Sample Input:
5 apple and 10 orange are rotten in the basket

Sample Output:

Sum of the numeric values: 15

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to extract all the numbers from a sentence using regular expressions and sum them.
Write a PHP function to iterate through a string, identify positive integers, and compute their total.
Write a PHP script to parse multiple lines of text, extract numerical values, and output their cumulative sum.
Write a PHP script to remove non-numeric characters from input and accurately calculate the sum of embedded numbers.

PHP Code Editor:

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