View Compilation Error

771442_0_0_31647.cpp: In function `int main()':
771442_0_0_31647.cpp:6: error: `cin' undeclared (first use this function)
771442_0_0_31647.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
771442_0_0_31647.cpp:7: error: `cout' undeclared (first use this function)
771442_0_0_31647.cpp:8: error: `system' undeclared (first use this function)
771442_0_0_31647.cpp:9: error: expected `;' before "return"