sqr.cpp:8: `int exp[500]' redeclared as different kind of symbol /usr/include/bits/mathcalls.h:101: previous declaration of `double exp(double)' sqr.cpp: In function `int main()': sqr.cpp:27: use of `exp' is ambiguous sqr.cpp:8: first declared as `int exp[500]' here /usr/include/c++/3.2.2/cmath:229: also declared as `std::exp' here sqr.cpp:35: use of `exp' is ambiguous sqr.cpp:8: first declared as `int exp[500]' here /usr/include/c++/3.2.2/cmath:229: also declared as `std::exp' here sqr.cpp:37: use of `exp' is ambiguous sqr.cpp:8: first declared as `int exp[500]' here /usr/include/c++/3.2.2/cmath:229: also declared as `std::exp' here