Modulo operator in Scala

TL ; DR:

• The modulo operator (%) calculates the remainder of dividing two values:

  println(10 % 2) // Output: 0
  println(15 % 4) // Output: 3
  println(20 % 3) // Output: 2
  

  
  

• It can also be used with variables:

  val a = 2
  val b = 4
  
  println(b % a) // Output: 0
  println(11 % b) // Output: 3
  

Full lesson:

Remember how we first learn about the division of two integer numbers in primary school?

The quotient is the number of times a division is completed fully, while the remainder is the amount left that doesn't entirely go into the divisor.

Here are some examples:

10 / 2 = quotient 5, remainder 0
15 / 4 = quotient 3, remainder 3
20 / 3 = quotient 6, remainder 2

The modulo operator:

The modulo operator (%) calculates the remainder of dividing two values:

println(10 % 2) // Output: 0
println(15 % 4) // Output: 3
println(20 % 3) // Output: 2

It can also be used with variables:

val a = 2
val b = 4

println(b % a) // Output: 0
println(11 % b) // Output: 3

Integer division

When both numbers are Ints, the / operator drops the fractional part and gives the integral part of the division (the quotient):

println(10 / 2) // Output: 5
println(15 / 4) // Output: 3
println(20 / 3) // Output: 6

It can also be used with variables:

val a = 2
val b = 3

val c = b / a
println(c) // Output: 1

Quotient and remainder:

In programming, we combine both these concepts to get the quotient and remainder of some division:

// Let's divide 26 by 3:
val quotient = 26 / 3
val remainder = 26 % 3

println(quotient) // Output: 8
println(remainder) // Output: 2

Assignment
Follow the Coding Tutorial and let's practice with quotient and remainder!

Hint
Look at the examples above if you get stuck.