<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Add a function to the existing code that takes an integer value as input and prints a square of '*' characters.
def print_square(length):<|im_end|>
<|im_start|>assistant
def print_square(length):
  for i in range(0, length):
    for j in range(0, length):
      print("*", end="")
    print("")<|im_end|>
