View Compilation Error

794918_0_0_17525.cpp:1:20: stdafx.h: No such file or directory
794918_0_0_17525.cpp:3: error: `main' must return `int'
794918_0_0_17525.cpp: In function `int main(...)':
794918_0_0_17525.cpp:7: error: `scanf' undeclared (first use this function)
794918_0_0_17525.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
794918_0_0_17525.cpp:26: error: `printf' undeclared (first use this function)
794918_0_0_17525.cpp:27: error: `getchar' undeclared (first use this function)