View Compilation Error

794976_0_0_25403.cpp:1:20: stdafx.h: No such file or directory
794976_0_0_25403.cpp:4: error: `main' must return `int'
794976_0_0_25403.cpp: In function `int main(...)':
794976_0_0_25403.cpp:6: error: `scanf' undeclared (first use this function)
794976_0_0_25403.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
794976_0_0_25403.cpp:8: error: `printf' undeclared (first use this function)