def print_table(row_size, col_size):
    '''Print a multiplication table with the specified number
    of rows and columns.'''
    for row_num in range(1, row_size + 1):
        for col_num in range(1, col_size + 1):
            print(col_num * row_num, end='\t')
        print() # end the line


def tuition_cost_calculator(target):
    '''Return the number of years until tuition is expected
    to reach the given target.'''

    cost = 65590    # 2016-2017 cost
    annual_increase = 0.0386    # average increase per year
    years = 0

    while cost < target:
        cost += cost * annual_increase 
        years += 1
        print("Cost in year {0} is ${1:.0f}".format(2016 + years, cost))
    
    print("{0} years until 100k".format(years))


def loop_examples():
    '''Examples of equivalent loops.'''
    
    data = [3, 10, 5, 2]

    # Version 1: for each loop
    for item in data:
        print(item)

    # Version 2: range loop
    for i in range(0, len(data)):
        print(data[i])
    
    # Version 3: while loop
    index = 0
    while index < len(data):
        print(data[index])
        index += 1


def doubles_to_100(num):
    '''Return how many times you'd have to double num
    for it to reach 100.
    E.g., doubles_to_100(20) = 3'''
    count = 0
    while num < 100:
        num *= 2
        count += 1
    return count