Which of the sets of statements below will add 1 to x if x is positive and subtract 1 from x if x is negative but leave x alone if x is 0? A) if (x 0) x++; else x--; B) if (x 0) x++; else if (x 0) x++; if (x

Question

Which of the sets of statements below will add 1 to x if x is positive and subtract 1 from x if x is negative but leave x alone if x is 0? A) if (x > 0) x++; else x--; B) if (x > 0) x++; else if (x < 0) x--; C) if (x > 0) x++; if (x < 0) x--; Else x = 0; D) if (x == 0) x = 0; else x++; X--; E) x++; x--;

Quizplus · Accepted Answer

B) if x is positive, x++ is performed else if x is negative x-- is performed and otherwise, nothing happens, or x is unaffected. In A, C, D and E, the logic is incorrect. In A, x-- is done if x is not positive, thus if x is 0, x becomes -1 which is the wrong answer. In C, if x is positive, then x++ is performed. In either case, the next statement is executed and if x is not negative, the else clause is performed setting x to 0. So if x is positive, it becomes 0 after this set of code. In D, x++ and x-- are both performed if x is not 0. And in E, this code does not attempt to determine if x is positive or negative, it just adds one and then subtracts 1 from x leaving x the same.

Which of the Sets of Statements Below Will Add 1