Question

I have two quantities in my class:

aToday, aYesterday

I have a number X between 1 and 100 entered by user.

Say he enters 10.

What I want to do is to find out if aToday is 10 percent more then aYesterday or 10 percent less then aYesterday.

How to write this ?

I am not getting 10 percent less. X percent more will be:

if(aToday > (x/100 * aYesterday))

How to check for 10 percent more ?

Answer 1

10% more:

if ( aToday > aYesterday*1.1 )

10% less

if ( aToday < aYesterday*0.9 )

Of course make sure you are calculating with for example double instances and not int instances, or you will have unexpected results due to the rounding

Edit

For a percentage x

x more (for example x = 10 -> 10 percent more)

if ( aToday > ( 1 + (x/100) ) * aYesterday )

and x less

if ( aToday < ( 1 - (x/100) ) * aYesterday )

The remark about using the correct types remains of course valid