Question

The following method is intended to return true if and only if the parameter val is a multiple of 4 but is not a multiple of 100 unless it is also a multiple of 400. The method does not always work correctly public boolean isLeapYear(int val) if ((val 4) == 0) return true; else return (val & 400) == 0; Which of the following method calls will return an incorrect response?
A .isLeapYear (1900)
B. isLeapYear (1984)
C. isLeapYear (2000)
D. isLeapYear (2001)
E. isLeapYear (2010)

Answer 1

Answer:

.isLeapYear (1900) will return an incorrect response

Explanation:

Given

The above method

Required

Which method call will give an incorrect response

(a) will return an incorrect response because 1900 is not a leap year.

When a year is divisible by 4, there are further checks to do before such year can be confirmed to be a leap year or not.

Since the method only checks for divisibility of 4, then it will return an incorrect response for years (e.g. 1900) that will pass the first check but will eventually fail further checks.

Hence, (a) answers the question;