View Compilation Error

0_0_4963967_22029.cpp:5: error: `double exp' redeclared as different kind of symbol
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/math.h:153: error: previous declaration of `double exp(double)'
0_0_4963967_22029.cpp:5: error: declaration of `double exp'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/math.h:153: error: conflicts with previous declaration `double exp(double)'
0_0_4963967_22029.cpp: In function `int main()':
0_0_4963967_22029.cpp:15: error: `ex' undeclared (first use this function)
0_0_4963967_22029.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)