View Compilation Error

0_0_30954677_28619.cpp: In function 'int main()':
0_0_30954677_28619.cpp:5:23: error: 'n' was not declared in this scope
     while(scanf("%d",&n) != EOF)
                       ^
0_0_30954677_28619.cpp:10:25: error: 'i' was not declared in this scope
             scanf("%d",&i);
                         ^