View Compilation Error

In file included from GCC4.9.2/x86_64-w64-mingw32/include/crtdefs.h:10:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:9,
                 from 0_0_15779142_19328.cpp:1:
0_0_15779142_19328.cpp: In function 'int main()':
0_0_15779142_19328.cpp:5:2: error: expected initializer before 'long'
  __int64 a[100000];
  ^
0_0_15779142_19328.cpp:6:20: error: 'n' was not declared in this scope
  while(scanf("%d",&n)!=EOF)
                    ^
0_0_15779142_19328.cpp:8:3: error: 'a' was not declared in this scope
   a[0]=0;
   ^