## very simple recursion examples.

def repeat(n, ch):
    """prec:  n is an ineger, ch is a one-character string
postc:  returns a string of length n containing the character ch."""
    if n == 0:
        return ""
    return repeat(n - 1, ch) + ch  

def print_repeat(n, ch):
    """prec:  n is an ineger, ch is a one-character string
postc:  print a string of length n containing the character ch."""
    if n == 0:
        return
    print(ch, end = "")
    print_repeat(n - 1, ch)

def main():
    print(repeat(50, "*"))
    print_repeat(50, "*")
main()