View Compilation Error

0_0_2532997_22583.cpp:1:16: math: No such file or directory
0_0_2532997_22583.cpp: In function `int main()':
0_0_2532997_22583.cpp:9: error: `abs' undeclared (first use this function)
0_0_2532997_22583.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)