View Compilation Error

784453_0_0_26490.cpp: In function `int main()':
784453_0_0_26490.cpp:1: error: `scanf' undeclared (first use this function)
784453_0_0_26490.cpp:1: error: (Each undeclared identifier is reported only once for each function it appears in.)
784453_0_0_26490.cpp:1: error: `printf' undeclared (first use this function)