how can I get an conditional output?

Question

I have two integers ( input & output )

when input >= 1 and <= 100000 , output will 20
when input >= 100001 and <= 200000 , output will 30
when input >= 200001 and <= 300000 , output will 40
when input >= 300001 and <= 400000 , output will 50
when input >= 400001 and <= 500000 , output will 60
...
...
and so on.

Max range of input is unlimited

How can I manage it in C#

Answer 1

output = (ceil(input/100000) +1)*10

The ceil function basically rounds above a float to an integer.

Answer 2

Simple arithemtic along with integer division should do the trick

var output = (input / 100000) * 10 + 20;

If the input is a floating point or decimal already then use Math.Floor