Introduction to While Loops

What is the output of the following code?

int x = 0;

while (x < 4) { x = x + 1;}

System.out.println("x is " + x);

• 0

• 1

• 3

• 4

What will be displayed when the following code is executed?

• 6 3 0

• 6 3

• 3 0

• 0

What will be the output of the following code?

int x = 0;

while( x > 0 ) {

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

x++; }

• 0 0 0 0 0

• 1 2 3 4 5

• 0 1 2 3 4

• 0 1 2 3 4 5 ... infinite loop

What is the output of the code?

int num = 1;

while ( num < 10 ) {

num += 2;

System.out.print( num + " "); }

• 3 5 7 9 11

• 3 5 7 9

• 1 3 5 7 9 11

• 1 3 5 7 9

What should go in place of /*missing code*/ so that the program only accepts the name "Bill" as the correct username?

String name = scan.next();

while( */ missing code */ ) {

System.out.print("Please enter the correct username: ");

name = scan.next();

}

//username is correct

System.out.println("Welcome Bill!");

• name == "Bill"

• name != "Bill"

• name.equals("Bill")

• !(name.equals("Bill"))

What is the value of sum at the completion of the code?

int val = 0;

int sum = 0;

while (num <= 8 ) {

sum += num;

num++; }

• sum = 36

• sum = 28

• sum = 42

• infinite loop

What is the value for x at the completion of the program?

int x = 1;

while( x < 100 ) {

x = x + x;

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

• 64

• 128

• 99

• 100

What should go in place of /* missing code */ so that the program will end when the number -1 is entered?

int val = scan.nextInt();

int total = 0;

while( /* missing code */) {

System.out.println("Please enter a number");

val = scan.nextInt();

total += val; }

• val == -1;

• val != - 1

• val = -1

• !(val == -1)