View Compilation Error

0_0_3210010_19026.cpp: In function `int main(int, char**)':
0_0_3210010_19026.cpp:30: error: `cin' undeclared (first use this function)
0_0_3210010_19026.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3210010_19026.cpp:40: error: `cout' undeclared (first use this function)
0_0_3210010_19026.cpp:40: error: `endl' undeclared (first use this function)