View Compilation Error

129012_0_24429.cpp: In function `int main()':
129012_0_24429.cpp:3: error: `scanf' undeclared (first use this function)
129012_0_24429.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
129012_0_24429.cpp:5: error: `printf' undeclared (first use this function)