View Compilation Error

264040_0_16344.cpp: In function `int main()':
264040_0_16344.cpp:6: error: `cin' undeclared (first use this function)
264040_0_16344.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
264040_0_16344.cpp:11: error: `abs' undeclared (first use this function)