CPSC120A
Fundamentals of Computer Science

Practice Session

• Sunday at 6PM

Reading Questions

Quiz

Nested Conditionals

• Just like with loops, we can put any code we want inside a conditional statment block, including more conditionals

• Putting a condition inside of another is equivalent to using the and operator

  if x > 0:
      if x < 10:
          print('x is greater than 0 and less than 10)

Chained Conditionals

• An else block is executed if the previous if statement is not true
• It can not have any condition
• An elif, a combination of else and if, is a chimera of an if and an else.

• It has a condition like an if, but the condition is only checked if the previous condition was not true

  if x < 0:
      print('x is negative')
  elif x < 10:
      print('x is not negative but is less than 10')
  else:
      print('x is greater than or equal to 10')

• Each condition in a chain of elifs is only tested if all of the previous were not true
• taking advantage of this, it is sometimes possible to reduce the number of logical operators used

• For example, the following more verbose code is functionally equivalent to the above code

  if x < 0:
      print('x is negative')
  if x > = 0 and x < 10:
      print('x is not negative but is less than 10')
  if x >= 10:
      print('x is greater than or equal to 10')

Lab