View Compilation Error

683505_0_0_28704.cpp: In function `int main()':
683505_0_0_28704.cpp:1: error: `scanf' undeclared (first use this function)
683505_0_0_28704.cpp:1: error: (Each undeclared identifier is reported only once for each function it appears in.)
683505_0_0_28704.cpp:1: error: `printf' undeclared (first use this function)