View Compilation Error

182898_0_12535.cpp: In function `int main()':
182898_0_12535.cpp:6: error: `sqrt' undeclared (first use this function)
182898_0_12535.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
182898_0_12535.cpp:21: error: call of overloaded `abs(double)' is ambiguous
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/stdlib.h:365: note: candidates are: int abs(int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cstdlib:153: note:                 long long int __gnu_cxx::abs(long long int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cstdlib:123: note:                 long int std::abs(long int)