DIV, MOD and useful patterns

Build the idea

Start with the concept and its key vocabulary.

Key idea

Use DIV and MOD to calculate a quotient and remainder in ERL and Python.

DIV and MOD describe two parts of the same division. In 17 divided by 5, there are 3 complete groups with 2 left over, so 17 DIV 5 is 3 and 17 MOD 5 is 2. Python writes these operators as // and %. They are useful for splitting minutes into hours, grouping items and spotting odd/even patterns.

DIV

Integer division that returns the whole-number quotient and discards the remainder.

MOD

An operation that returns the remainder after division.

Quotient

The result of division; with DIV, only the whole-number part is returned.

Remainder

The amount left after making as many complete groups as possible.

Keep these in mind

ERL DIV maps to Python //.
ERL MOD maps to Python %.
A number MOD 2 gives 0 for an even number and 1 for an odd positive number.
For time conversion, DIV 60 gives whole hours and MOD 60 gives leftover minutes.

Build the idea

Start with the concept and its key vocabulary.

Key idea

Use DIV and MOD to calculate a quotient and remainder in ERL and Python.

DIV

Integer division that returns the whole-number quotient and discards the remainder.

MOD

An operation that returns the remainder after division.

Quotient

The result of division; with DIV, only the whole-number part is returned.

Remainder

The amount left after making as many complete groups as possible.

Keep these in mind

ERL DIV maps to Python //.
ERL MOD maps to Python %.
A number MOD 2 gives 0 for an even number and 1 for an odd positive number.
For time conversion, DIV 60 gives whole hours and MOD 60 gives leftover minutes.