how to improve - HCF

[vlad from moscow]

I did not suggest to use abs because I do not like to call a function (moreover two times) for such simple operations.

As for the replacement whether for example 10 % 6 is the same as 6 % 10?

[ne555]

6%10 = 6
In the next iteration you will compute 10%6

I do not like to call a function (moreover two times) for such simple operations.

There is no big overload. If that's an issue you could inline the call.
¿What do you think that functions are for?

[andywestken]

Also, note that some compilers supply intrinsics for small, common operations. abs() is one of the functions which Visual C++ treats in this way.
http://msdn.microsoft.com/en-US/library/5704bbxw%28v=vs.80%29

Compiler Intrinsics
http://msdn.microsoft.com/en-us/library/26td21ds%28v=vs.80%29

Most functions are contained in libraries, but some functions are built in (that is, intrinsic) to the compiler. These are referred to as intrinsic functions or intrinsics.