View Compilation Error

31315_0_899.cpp: In function `int main()':
31315_0_899.cpp:3: error: `scanf' undeclared (first use this function)
31315_0_899.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
31315_0_899.cpp:5: error: `printf' undeclared (first use this function)