which is the meaning of this

f4cff2dd-4313-4428-8b4c-1c069143580a
f4cff2dd-4313-4428-8b4c-1c069143580a(23) : error C2668: 'sqrt' : ambiguous call to overloaded function
        S:\checker\compile\vc10\include\math.h(589): could be 'long double sqrt(long double)'
        S:\checker\compile\vc10\include\math.h(541): or       'float sqrt(float)'
        S:\checker\compile\vc10\include\math.h(127): or       'double sqrt(double)'
        while trying to match the argument list '(long)'

use double or float as datatype as prototype for sqrt() requires non-int types. you have probably used int for d no whose sqrt is found.