View Compilation Error

0_0_6425095_750.cpp: In function `int main()':
0_0_6425095_750.cpp:13: error: `fabs' undeclared (first use this function)
0_0_6425095_750.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6425095_750.cpp:14: error: `put' undeclared (first use this function)