Loops

Question 1

What two main categories of loops are there?

Answer 1

Pre-test and post-test.

Question 2

Which loop constructs (in Java) exist for doing a post-test loop?

Answer 2

Do while loop.
do {
    // Do stuff.
} while(condition);

Question 3

What loop constructs (in Java) exist to perform a pre-test loop?

Answer 3

The while and for loops.
while(condition) { }
for(initialize; condition; update) { }

Question 4

What would be printed?
for(int i = 0; i < 9; i++) {
print(i + “, “);
}

Answer 4

“0, 1, 2, 3, 4, 5, 6, 7, 8, “

Question 5

What are the values of the variables after the loop?
int x = 3, y = 0;
while(x % 5 != 0) {
   y += x++;
}

Answer 5

y = 7
x = 5

Question 6

What are the values of the variables after the loop?
int qq = 16;
while(qq > 3)
qq–;

Answer 6

qq = 3

Question 7

What are the values of the variables after the loop?
int x = 5, y = 15;
while(x != y) {
    x++;
    y--;
}

Answer 7

x and y = 10

Question 8

What are the values of the variables after the loop?
int x = 4, y = 15;
while(x != y) {
    x++;
    y--;
}

Answer 8

There is no after the loop. This loop will run infinitely.