Mixed code tracing: what does it print? (practice) · Grades 9–12

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 total = 0
• 2 for i in range(1, 9):
• 3 if i % 3 == 0:
• 4 total += i
• 5 print(total)
• 2 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(9))
• 6 print(check(13))
• 3 What is printed?
• 1 word = "planet"
• 2 count = 0
• 3 for ch in word:
• 4 if ch == "n":
• 5 count += 1
• 6 print(count)
• 4 What is printed?
• 1 def bigger(a, b):
• 2 if a > b:
• 3 return a
• 4 return b
• 5 print(bigger(14, 15) * 3)
• 5 What is printed?
• 1 age = 8
• 2 height = 154
• 3 if age >= 11 and height >= 134:
• 4 print("ride")
• 5 else:
• 6 print("wait")
• 6 What is printed?
• 1 word = "robot"
• 2 print(len(word), word[2])