View Compilation Error

917923_0_0_29485.cpp: In function `int main()':
917923_0_0_29485.cpp:36: error: `scanf' undeclared (first use this function)
917923_0_0_29485.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)
917923_0_0_29485.cpp:38: error: `printf' undeclared (first use this function)