View Compilation Error

504022_0_0_2307.cpp: In function `int main()':
504022_0_0_2307.cpp:5: error: `cin' undeclared (first use this function)
504022_0_0_2307.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
504022_0_0_2307.cpp:10: error: `cout' undeclared (first use this function)
504022_0_0_2307.cpp:10: error: `endl' undeclared (first use this function)