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# Remainder - modular arithmetic

# systematically restrict computation to a range

# long division - divide by a number, we get a quoitent plus remainder

# quotient is interget division //, the remainder is % (docs)

# problem - get the ones digit of a number

num = 49

tens = num // 10

ones = num % 10

print tens,ones

print tens * 10 + ones

# clock arithmetic - 24 hour clocks

hour = 20

shift = 8

print (hour + shift) % 24

# application - screen wraparound

# spaceship from week seven

width = 800

position = 2

move = -5

position = (position + move) % width

print position

# Data conversion operations

# convert an integer into string - str

# convert an hour into 24-hour format "%03:00", always print zero

hour = 3

ones = hour % 10

tens = hour // 10

print tens, ones, ":00"

print str(tens) + str(ones) + ":00"

# convert a string into numbers using int and float

# Python modules - extra functions implemented outside basic