View Compilation Error

0_0_7136559_31641.cpp:2:15: math: No such file or directory
0_0_7136559_31641.cpp: In function `int main()':
0_0_7136559_31641.cpp:16: error: `abs' undeclared (first use this function)
0_0_7136559_31641.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)