PHP Exercises: Reads a date and prints the day of the date

PHP: Exercise-59 with Solution

Write a PHP program to that reads a date (from 2004/1/1 to 2004/12/31) and prints the day of the date. Jan. 1, 2004, is Friday. Note that 2004 is a leap year.
Two integers m and d separated by a single space in a line, m ,d represent the month and the day.

Input:Input numbers (real numbers) are separated by a space.
Input 0 to exit.

Visual Presentation:

Sample Solution:

PHP Code:

<?php
// Define an array of days in a non-leap year
$days = explode(',', '0,31,60,91,121,152,182,213,244,274,305,335');
// Define an array of corresponding day names
$format = explode(',', 'Wednesday,Thursday,Friday,Saturday,Sunday,Monday,Tuesday');

// Continue reading lines from standard input until an empty line is encountered
while (($line = trim(fgets(STDIN))) !== '') {
    // Extract month and day values from the input line
    sscanf($line, '%d %d', $m, $d);

    // Check if the month is 0, which indicates the end of input
    if ($m === 0) {
        break;
    }

    // Calculate the day of the year using the pre-defined array
    $n = $days[$m - 1] + $d;

    // Determine the day of the week using the pre-defined array of day names
    $today = $format[$n % 7];

    // Output the result
    echo "The day is: " . $today, PHP_EOL;
}
?>

Explanation:

• Define Days Array:
• An array named $days is defined using explode(), representing the cumulative number of days at the end of each month in a non-leap year.
• The values are:
• January: 0
• February: 31
• March: 60
• April: 91
• May: 121
• June: 152
• July: 182
• August: 213
• September: 244
• October: 274
• November: 305
• December: 335
• Define Day Names Array:
• An array named $format is defined, which contains the names of the days of the week, starting from Wednesday.
• Read Input Until Empty Line:
• A while loop continues to read lines from standard input until an empty line is encountered.
• Extract Month and Day:
• The input line is parsed using sscanf() to extract the month ($m) and day ($d) values.
• Check for End of Input:
• If the month is 0, the loop breaks, indicating the end of input.
• Calculate Day of the Year:
• The day of the year ($n) is calculated by adding the cumulative days of the month (from the $days array) to the day of the month ($d).
• Determine Day of the Week:
• The day of the week is determined by taking the modulus of $n with 7 and using it to index into the $format array.
• Output the Result:
• The program outputs the day of the week corresponding to the given month and day.

Sample Input:
9 15

Sample Output:

The day is: Thursday

Flowchart:

PHP Code Editor:

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