View Compilation Error

30071_0_497.cpp: In function `int main()':
30071_0_497.cpp:8: error: `scanf' undeclared (first use this function)
30071_0_497.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
30071_0_497.cpp:8: error: `getchar' undeclared (first use this function)
30071_0_497.cpp:20: error: `printf' undeclared (first use this function)