具有这种模式的 x 的公式？

Question

x is a number from 1 to 10.

What could be the formula for x with this pattern?

x = 1 -> output 0
x = 2 -> output 1
x = 3 -> output 2
x = 4 -> output 3
x = 5 -> output 4
x = 6 -> output 0
x = 7 -> output 1
x = 8 -> output 2
x = 9 -> output 3
x = 10 -> output 4

I came up with

x % 5 - 1

but does not work when x = 5 or x = 10

Answer 1

你很接近，只需将减法运算移到模运算之前

(x - 1) % 5