PHP Exercises: Find the larger value from two positive integer values that is in the range 20..30 inclusive

Last update on May 28 2025 09:29:01 (UTC/GMT +8 hours)

21. Largest in Range 20..30

Write a PHP program to find the larger value from two positive integer values that is in the range 20..30 inclusive, or return 0 if neither is in that range.

Sample Solution:

PHP Code :

<?php
// Define a function that compares two values based on certain conditions
function test($x, $y) 
{
    // Check if both $x and $y are within the range of 20 to 30
    if ($x >= 20 && $x <= 30 && $y >= 20 && $y <= 30) {
        // Compare $x and $y, return the greater value
        if ($x >= $y) {
            return $x;
        } else {
            return $y;
        }
    } elseif ($x >= 20 && $y <= 30) {
        // Check if only $x is within the range, return $x
        return $x;
    } elseif ($y >= 20 && $y <= 30) {
        // Check if only $y is within the range, return $y
        return $y;
    } else {
        // Return 0 if neither condition is met
        return 0;
    }
}

// Test the function with different sets of coordinates
echo test(78, 95)."\n";
echo test(20, 30)."\n";
echo test(21, 25)."\n";
echo test(28, 28)."\n";
?>

Explanation:

Function Definition:

The test function takes two parameters, $x and $y, and compares them based on specific conditions.

Condition Checks:

Both values within the range [20, 30]:

If both $x and $y are between 20 and 30, the function compares them and returns the greater value.

Only $x within the range [20, 30]:

If only $x is within the range, the function returns $x.

Only $y within the range [20, 30]:

If only $y is within the range, the function returns $y.

Neither value in the range:

If neither $x nor $y is within the range, the function returns 0.

Function Calls and Results:

First Call: test(78, 95) returns 0 since neither value is within the range.

Second Call: test(20, 30) returns 30 as both are in range, and 30 is the greater value.
Third Call: test(21, 25) returns 25 as both are in range, and 25 is the greater value.
Fourth Call: test(28, 28) returns 28 as both are in range, and both values are equal.

Output:

Visual Presentation:

PHP Basic Algorithm Exercises: Find the larger value from two positive integer values that is in the range 20..30 inclusive.

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to compare two positive integers and return the larger one if it falls within 20–30, otherwise return 0.
Write a PHP function to check if either of two numbers is in the range 20 to 30 and then pick the maximum value.
Write a PHP program to evaluate two numbers for range membership and output the largest if qualified or zero if not.
Write a PHP script to integrate conditional operators to select the greater number from two inputs only if they are within the desired range.

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