What is the result of the expression (int) (0.1 + 0.7) * 10 in PHP?

Question

PHP Intermediate — Hard

What is the result of the expression (int) (0.1 + 0.7) * 10 in PHP?

Accepted Answer

Floating-point numbers in PHP (IEEE 754) often cannot represent decimals like 0.1 or 0.7 exactly. The sum 0.1 + 0.7 results in approximately 0.7999999999999999. Multiplying this by 10 yields 7.999999999999999. Casting this value to an integer truncates the decimal part, resulting in 7, not 8.