Division problem

  • Thread starter Thread starter Jon
  • Start date Start date
J

Jon

Hello all,

I'm trying to work out why the following always returns 0:

ulong b = (750 / 1128);

I've tried other types, not just ulong but always with the same
results, 0;

Am I missing something? It been a long day!

Thanks

Jon
 
Hello all,

I'm trying to work out why the following always returns 0:

ulong b = (750 / 1128);

I've tried other types, not just ulong but always with the same
results, 0;

Am I missing something? It been a long day!

Thanks

Jon
Click to expand...

John

ulong is an integer data type (unsigned 64 bit) which cannot represent
the fraction 750/1120

If you are working with non-integral numbers you need to work with
types such as float, single, double etc.

However, one word of warning. Even when an expression is being
assigned to a non-integral numeric type the result is evaluated is
though it is an integer if all the terms themselves are integers. The
expression (750 / 1128) will be treated as an integer because 750,
1128 are themselves integers, and since 0 < (750/1120) < 1 it is
rounded down to 0

Try this instead:

float b = 750.0F / 1128.0F

I guarantee it will not be zero.
 
Hello all,

I'm trying to work out why the following always returns 0:

ulong b = (750 / 1128);

I've tried other types, not just ulong but always with the same
results, 0;

Am I missing something? It been a long day!

Thanks

Jon
Click to expand...

ulong is an integer and 750 / 1128 equals 0.66 - the integer part is 0

If you need to round it up, use Math.Round, for example

ulong b = Convert.ToUInt64(Math.Round(750D / 1128D)); // =1 :-)
 
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