View Compilation Error

137509_0_17371.cpp: In function `int main()':
137509_0_17371.cpp:4: error: `cin' undeclared (first use this function)
137509_0_17371.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
137509_0_17371.cpp:5: error: `cout' undeclared (first use this function)
137509_0_17371.cpp:5: error: `endl' undeclared (first use this function)