View Compilation Error

212050_0_19444.c: In function `main':
212050_0_19444.c:4: error: `cin' undeclared (first use in this function)
212050_0_19444.c:4: error: (Each undeclared identifier is reported only once
212050_0_19444.c:4: error: for each function it appears in.)
212050_0_19444.c:12: error: `cout' undeclared (first use in this function)
212050_0_19444.c:12: error: `endl' undeclared (first use in this function)