round_sum.py

#CodingBat - Python

#round_sum

#For this problem, we'll round an int value up to the next multiple of 10 if 
#its rightmost digit is 5 or more, so 15 rounds up to 20. Alternately, round 
#down to the previous multiple of 10 if its rightmost digit is less than 5, so 
#12 rounds down to 10. Given 3 ints, a b c, return the sum of their rounded 
#values. To avoid code repetition, write a separate helper "def round10(num):"
#and call it 3 times. Write the helper entirely below and at the same indent 
#level as round_sum().

# round_sum(16, 17, 18) → 60
# round_sum(12, 13, 14) → 30
# round_sum(6, 4, 4) → 10

def round_sum(a, b, c):
    return round10(a) + round10(b) + round10(c)

def round10(num):
    if num % 10 >= 5:
        return num + (10 - num % 10)
    elif num % 10 < 5:
        return num - (num % 10)
    
#To Check:
#print(round_sum(16, 17, 18))
#print(round_sum(12, 13, 14))
#print(round_sum(6, 4, 4))