While loop

Which two statements are used to implement iteration?

• IF and WHILE
• ELSE and WHILE
• FOR and WHILE
• IF and ELSE

• 5
  4
  3
  2
  1
• 4
  3
  2
  1
  0
• 5  4  3  2  1
• 4  3  2  1  0

• 5
  4
  3
  2
  1
• 4
  3
  2
  1
  0
• 5  4  3  2  1
• 4  3  2  1  0

• 5
  4
  3
  2
  1
• 5  4  3  2  1
• 4
  3
  2
  1
  0
• 4  3  2  1  0

• 12  9  6  3  0
• 0  3  6  9  12
• 9  6  3  0
• 0  3  6  9

• 12  17   22
• 5
• 12
• 5  10

• Hello world!
• Hello world
• Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  ......(repeated continuously)
• Error

• Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  (repeated continuously)
• Hello world!
• Hello world!
  break              
• Error

• Hello world!
• Error
• Hello world!
  False
• Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  (repeated continuously)