PHP Exercises: Check if two numbers are approximately equal to each other
PHP: Exercise-94 with Solution
Write a PHP program to check if two numbers are approximately equal to each other.
Note: Use abs() to compare the absolute difference of the two values to epsilon. Omit the third parameter, epsilon, to use a default value of 0.001.
Sample Solution:
PHP Code:
<?php
// Licence: https://bit.ly/2CFA5XY
// Function definition for 'approximatelyEqual' that takes two numbers and an optional epsilon value as parameters
function approximatelyEqual($number1, $number2, $epsilon = 0.001)
{
// Check if the absolute difference between the numbers is less than the epsilon value
if (abs($number1 - $number2) < $epsilon)
// If approximately equal, return 1 (true)
return 1;
else
// If not approximately equal, return 0 (false)
return 0;
}
// Call 'approximatelyEqual' with two numbers and display the result using 'print_r'
print_r(approximatelyEqual(10.0, 10.00001));
// Display a newline
echo("\n");
// Call 'approximatelyEqual' with two different numbers and display the result using 'print_r'
print_r(approximatelyEqual(10.0, 10.01));
?>
Explanation:
- Function Definition:
- The approximatelyEqual function takes three parameters:
- $number1: the first number to compare.
- $number2: the second number to compare.
- $epsilon: an optional precision threshold, defaulted to 0.001.
- Check Approximate Equality:
- The function calculates the absolute difference between $number1 and $number2 using abs($number1 - $number2).
- If this difference is less than $epsilon, the numbers are considered approximately equal.
- Return Result:
- If the numbers are approximately equal, the function returns 1 (true).
- If not, it returns 0 (false).
- Function Calls and Output:
- approximatelyEqual(10.0, 10.00001) checks if 10.0 and 10.00001 are approximately equal within 0.001. Result: 1 (true).
- approximatelyEqual(10.0, 10.01) checks if 10.0 and 10.01 are approximately equal within 0.001. Result: 0 (false).
Output:
1 0
Flowchart:
PHP Code Editor:
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