PHP Exercises: Print mode values from a given a sequence of integers

PHP: Exercise-60 with Solution

Write a PHP program to print mode values from a given a sequence of integers. The mode value is the element which occurs most frequently. If there are several mode values, print them in ascending order.

Input:A sequence of integer’s ai (1 ≤ ai ≤ 100). The number of integers is less than or equals to 100.

Sample Solution:

PHP Code:

<?php
// Initialize an empty array to store input values
$hoge = array();

// Continue reading lines from standard input until an empty line is encountered
while ($hoge[] = trim(fgets(STDIN))) {}

// Count the occurrences of each unique value in the array
$hage = array_count_values($hoge);

// Find the maximum occurrence count
$max = max($hage);

// Find the keys (values) that have the maximum occurrence count
$koge = array_keys($hage, $max);

// Output the result
echo "Mode values (in ascending order):\n";

// Sort the keys in ascending order
sort($koge, SORT_ASC);

// Iterate through the sorted keys and output each value
foreach ($koge as $val) {
    echo $val . PHP_EOL;
}

?>

Explanation:

• Initialize an Empty Array:
• An empty array named $hoge is initialized to store input values.
• Read Input Until Empty Line:
• A while loop reads lines from standard input using fgets(STDIN), trimming whitespace with trim().
• Each non-empty line is added to the $hoge array.
• The loop stops when an empty line is encountered.
• Count Occurrences of Each Value:
• The function array_count_values() is used to count the occurrences of each unique value in the $hoge array.
• The result is stored in the $hage associative array, where keys are the unique values and values are their counts.
• Find Maximum Occurrence Count:
• The max() function is used to find the highest occurrence count from the $hage array, stored in the variable $max.
• Get Keys with Maximum Occurrence:
• The function array_keys() retrieves all keys (unique values) from $hage that have the occurrence count equal to $max.
• The result is stored in the $koge array.
• Output the Result:
• A message "Mode values (in ascending order):" is printed to indicate what will be displayed next.
• Sort the Keys in Ascending Order:
• The sort() function is used to sort the $koge array in ascending order.
• Iterate and Output Each Mode Value:
• A foreach loop iterates through the sorted $koge array, printing each mode value on a new line.

Sample Input:
6
7
4
6
9
8
6
4
10
8
4
5

Sample Output:

Mode values (in ascending order):
4
6

Flowchart:

PHP Code Editor:

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