Week 5.1

What is the difference between a while loop and a do-while

• There is no difference

• A do-while loop always executes at least once

• A while loop always executes at least once

• A do-while loop can only be used for counting

Which keyword is used to set up a while loop?

• for

• while

• do

• until

What is the output of the following code snippet?

var count = 0; while (count < 5) {

document.write( count + "</br>");

count++; }

• 0

  1

  2

  3

  4

• 0 1 2 3 4

• 1 2 3 4 5

• 1

  2

  3

  4

  5

What is the output of the following code snippet?

var i = 0;

do {

document.write(i + "<br>")

i++;

} while (i < 0);

• 0

• 0

  1

  2

  3

  4

  5

• An infinite loop

• 1

What is the output of the following code snippet?

document.write("5" + 5);

• 5

  5

• "5" + 5

• "55"

• 10

What is the output of the following code snippet?

document.write(5 + 5);

• 5

  5

• "5" + 5

• "55"

• 10

Which logical operator would you use to invert the truth value of a condition?

• &&

• ||

• !

• ==

Which of the following is true about the logical operator "||"?

• It evaluates to true if both operands are true.

• It evaluates to true if at least one operand is true.

• It evaluates to false if both operands are false.

• It evaluates to false if at least one operand is false.

What is the result of the following expression in JavaScript?

!(true && false)

• true

• false

• Syntax Error

• undefined

What is the output of the following while loop?

i = 0;

while(i < 5) {

document.write(i);

}

• 012345

• 12345

• 01234

• error