Trace the functions: what is returned? (stretch) · Grade 11

The programs to trace

Directions: Trace each program line by line without a computer. Keep a note of every variable as it changes, then write exactly what the program prints or the final value.

• 1 What is printed?
• 1 def f(x):
• 2 return x * 2
• 3 def g(x):
• 4 return x - 1
• 5 print(g(f(8)))
• 2 What is printed?
• 1 a = 64
• 2 b = 24
• 3 while b != 0:
• 4 t = b
• 6 a = t
• 7 print(a)
• 3 What is printed?
• 1 def stack(n):
• 2 total = 0
• 3 for i in range(1, n + 1):
• 4 total += i
• 5 return total
• 6 print(stack(5))
• 4 What is printed?
• 1 def times_four(n):
• 2 return n * 4
• 3 total = 0
• 4 for i in range(1, 3):
• 5 total += times_four(i)
• 6 print(total)
• 5 What is printed? Write each line.
• 1 def check(n):
• 2 if n % 3 == 0:
• 3 return "fits"
• 4 return "left over"
• 5 print(check(18))
• 6 print(check(16))
• 6 What is printed?
• 1 def frame(word, edge):
• 2 return edge + word + edge
• 3 print(len(frame("meadow", "##")))