Rounding integers to nearest multiple of 10 [duplicate]

Question

I am trying to figure out how to round prices - both ways. For example:

Round down 43 becomes 40 143 becomes 140 1433 becomes 1430  Round up 43 becomes 50 143 becomes 150 1433 becomes 1440 

I have the situation where I have a price range of say:

£143 - £193 

of which I want to show as:

£140 - £200 

as it looks a lot cleaner

Any ideas on how I can achieve this?

Answer 1

I would just create a couple methods;

int RoundUp(int toRound) {      if (toRound % 10 == 0) return toRound;      return (10 - toRound % 10) + toRound; }  int RoundDown(int toRound) {     return toRound - toRound % 10; } 

Modulus gives us the remainder, in the case of rounding up 10 - r takes you to the nearest tenth, to round down you just subtract r. Pretty straight forward.

Answer 2

You don't need to use modulus (%) or floating point...

This works:

public static int RoundUp(int value) {     return 10*((value + 9)/10); }  public static int RoundDown(int value) {     return 10*(value/10); }