View Compilation Error

0_0_36232173_11965.cpp:4:7: error: expected constructor, destructor, or type conversion before '(' token
  scanf("%d",&n);
       ^
0_0_36232173_11965.cpp:5:3: error: expected unqualified-id before 'for'
   for(;n>0;n--)
   ^
0_0_36232173_11965.cpp:5:8: error: 'n' does not name a type
   for(;n>0;n--)
        ^
0_0_36232173_11965.cpp:5:12: error: 'n' does not name a type
   for(;n>0;n--)
            ^
0_0_36232173_11965.cpp:11:1: error: expected declaration before '}' token
 }
 ^