View Compilation Error

0_0_3891954_13758.cpp: In function `int _tmain()':
0_0_3891954_13758.cpp:28: error: `scanf' undeclared (first use this function)
0_0_3891954_13758.cpp:28: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3891954_13758.cpp:30: error: `printf' undeclared (first use this function)