View Compilation Error

352011_0_30975.cpp: In function `int main()':
352011_0_30975.cpp:46: error: no matching function for call to `pow(double, <unknown type>)'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/math.h:156: note: candidates are: double pow(double, double)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:361: note:                 long double std::pow(long double, int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:357: note:                 float std::pow(float, int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:353: note:                 double std::pow(double, int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:349: note:                 long double std::pow(long double, long double)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:345: note:                 float std::pow(float, float)