Functions
Functions: parameters, multiple return values, GCD and primality.
A function in Go is declared with the word func; the result type is written after the parameter list. A language highlight — a function can return several values at once.
Below is Euclid's algorithm for the greatest common divisor.
Go
GCD of two numbers. Enter: 12 8
The line a, b = b, a%b is a multiple assignment: both sides are evaluated simultaneously, no temporary variable needed.
Functions returning bool express checks. For primality, divisors are tried up to the square root: the condition i*i <= n.
Go
Primality check up to the square root. Enter: 97
An example of multiple return values: func minMax(a []int) (int, int) can return the minimum and maximum in a single pass — try writing that function as your task.
Then solve the attached problems "GCD of Two Numbers" and "Prime Check" — and mark the lesson as completed.