I have 2 methods to compute 2^k:

 int pow2(int k)  { return ((int)1<<k); }
 long pow2(int k) { return ((long)1<<k); }

This gives me options, for example:

 int a = pow2(30);  // 2^30=1073741824
 long b = pow2(31); // 2^31=2147483648

Note that
 int a = pow2(31); // 2^31 = -2147483648
would give an overflow.

However I get an error:
 Duplicate declaration of method "pow2"

Should not the compiler distinguish those 2 methods?

I could just always use the long version, casting to int if necessary, but it is a bit annoying.

Any comment?

jorgecardoso wrote on Oct 19^th, 2007, 4:36pm:


But that suggests you could change the parameter type:

long pow2(long k) { return ((long) 1<<k); }

And now call it like this:
long b = pow2((long) 31);

-- djones