View Compilation Error

202744_0_742.cpp: In function `int main()':
202744_0_742.cpp:4: error: `cin' undeclared (first use this function)
202744_0_742.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
202744_0_742.cpp:13: error: `cout' undeclared (first use this function)
202744_0_742.cpp:21: error: `endl' undeclared (first use this function)