View Compilation Error

0_0_9061887_25353.cpp: In function `int main()':
0_0_9061887_25353.cpp:6: error: `cin' undeclared (first use this function)
0_0_9061887_25353.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9061887_25353.cpp:12: error: `fabs' undeclared (first use this function)
0_0_9061887_25353.cpp:13: error: `cout' undeclared (first use this function)
0_0_9061887_25353.cpp:13: error: `endl' undeclared (first use this function)