View Compilation Error

235398_0_26979.cpp: In function `int main()':
235398_0_26979.cpp:5: error: `scanf' undeclared (first use this function)
235398_0_26979.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
235398_0_26979.cpp:6: error: `printf' undeclared (first use this function)