Due Date: Thursday, February 10, 2005, before the beginning of your lecture section.
Goal: the goal of this assignment is to learn how to deal with numbers in Java.
1. What will be the result of the following expressions:
Answer: Java computations are left to right, so we first compute 2/1=2, then 2/4=0. The result is 0.(b) 2.0/1.0/4.0
Answer: First we compute 2.0/1.0=2.0, then 2.0/4.0=0.5.(c) a++ (if a was originally 2)
Answer: 3(d) --a (if a was originally 2)
Answer: 1(e) 2%3%4
Answer: First, we compute 2%3=2, then 2%4=2. The result is 2.(f) -2.0%-0.9*-4.0
Answer: First, we compute -2.0%-0.9=-0.2, then -0.2%-4.0=-0.2. The result is -0.2.2. Let a be a variable of type int. Use type casting to assign a's value to the following variables:
(a) longA of type long
Answer: longA = (long)a;(b) doubleA of type double
Answer: doubleA = (double)a;(c) stringA of type string
Answer: stringA = "" + a; Comment: The book does not explicitly call this transformation type casting, so if you answered that type casting is not possible in case (c), it is also a correct answer.Explain in which of these three cases we can use type conversion instead of type casting.
Answer: type conversion is possible in the first two cases but not for conversion to a string.If type conversion is possible, what is the advantage of type casting?
Answer: types casting make type transformation more explicit, thus clearer to readers of the code and less error-prone.