View Compilation Error

0_0_7626725_14399.cpp: In function `int main()':
0_0_7626725_14399.cpp:5: error: `cin' undeclared (first use this function)
0_0_7626725_14399.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7626725_14399.cpp:8: error: `in' undeclared (first use this function)
0_0_7626725_14399.cpp:9: error: `out' undeclared (first use this function)