Question

What does this method call doubleNumber(7.8); return, given the following method? public double doubleNumber(double myNumber) { return (double) (int) myNumber * 2; }

Answer 1

The method call doubleNumber(7.8) will return 14, as the method first truncates the decimal part by casting the double to an integer, and then doubles the integer value.

Step-by-step explanation:

The student is asking what the doubleNumber(7.8) method call returns, given a specific Java method definition. The provided method definition indicates that it first casts myNumber to an integer, which truncates the decimal portion, and then multiplies the result by 2.

Therefore, the method doubleNumber(7.8) will first convert 7.8 to 7 (since casting to an integer drops any fractional part), and then double that number, resulting in 14.