PHP Exercises: Print the values of x, y where a, b, c, d, e and f are specified

PHP: Exercise-49 with Solution

Write a PHP program which solve the equation:
ax+by=c
dx+ey=f
Print the values of x, y where a, b, c, d, e and f are given.

Input:
a,b,c,d,e,f separated by a single space.
(-1,000 ≤ a,b,c,d,e,f ≤ 1,000)

Sample Solution:

PHP Code:

<?php
// Function to convert an input to a float
function to_f($e) {
    return (float)$e;
} 

// Read input from standard input (STDIN) line by line
while ($line = fgets(STDIN)) {
    // Explode the line into an array using space as the delimiter
    $a = explode(" ", $line);

    // Convert each element of the array to a float using the "to_f" function
    $a = array_map("to_f", $a);

    // Calculate the values of x and y using the provided formulas
    $x = ($a[2] * $a[4] - $a[1] * $a[5]) / ($a[0] * $a[4] - $a[3] * $a[1]);
    $y = ($a[2] * $a[3] - $a[0] * $a[5]) / ($a[1] * $a[3] - $a[0] * $a[4]);

    // Print the values of x and y with three decimal places
    print("Values of x and y:\n");
    printf("%.3f %.3f\n", $x, $y);
}

?>

Explanation:

• Function Definition:
• A function to_f($e) is defined, which converts its input to a float using (float)$e.
• Reading Input:
• A while loop reads input from standard input (STDIN) line by line using fgets(STDIN).
• Processing Input:
• Each line read is split into an array of strings using explode(" ", $line), using space as the delimiter.
• Converting Strings to Floats:
• The array_map("to_f", $a) function applies the to_f function to each element of the array $a, converting all elements to floats.
• Calculating Values of x and y:
• The values of x and y are calculated using specific mathematical formulas involving the elements of the array.
• Output:
• The results for x and y are printed with three decimal places using printf("%.3f %.3f\n", $x, $y), preceded by the message "Values of x and y:".

Output:

Values of x and y:
-1.684 2.737

Flowchart:

PHP Code Editor:

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