View Compilation Error

0_0_8575934_12515.cpp:1:20: stdafx.h: No such file or directory
0_0_8575934_12515.cpp: In function `int main()':
0_0_8575934_12515.cpp:14: error: `n' undeclared (first use this function)
0_0_8575934_12515.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)