For each of the following while loops, how many times will the loop execute its body? Remember that "zero," "infinity," and "unknown" are legal answers.

Question

For each of the following while loops, how many times will the loop execute its body? Remember that "zero," "infinity," and "unknown" are legal answers.

a)

int x = 1;

while (x < 100) {

System.out.print(x + " ");

x += 10;

}

b)

int max = 10;

while (max < 10) {

System.out.println("count down: " + max);

max--;

}

c)

int x = 250;

while (x % 3 != 0) {

System.out.println(x);

}

d)

int x = 2;

while (x < 200) {

System.out.print(x + " ");

x *= x;

}

e)

String word = "a";

while (word.length() < 10) {

word = "b" + word + "b";

}

System.out.println(word);

Answer 1

why not just copy and paste each one

into main(), run it, and observe what happens????

(a) output is 1 11 21 31 41 51 61 71 81 91

(b) will not execute at all because the test condition

10<10 fails the first time

(c) Infinite loop... displays 250 until program process

is terminated (CONTROL-C); the value of x is not

changed in the loop

(d) The output is 2 4 16

note that upon 3rd iteration 16*16 = 256 > 200, so

test condition fails

(e) output is bbbbbabbbbb