View Compilation Error

221070_0_19925.cpp: In function `int main()':
221070_0_19925.cpp:4: error: `cin' undeclared (first use this function)
221070_0_19925.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
221070_0_19925.cpp:8: error: `cout' undeclared (first use this function)
221070_0_19925.cpp:8: error: `sun' undeclared (first use this function)
221070_0_19925.cpp:8: error: `endl' undeclared (first use this function)