View Compilation Error

0_0_17536092_28596.cpp: In function 'int main()':
0_0_17536092_28596.cpp:4:10: error: expected initializer before '.' token
     int a.n.i.sum;
          ^
0_0_17536092_28596.cpp:5:23: error: 'n' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                       ^
0_0_17536092_28596.cpp:7:5: error: 'sum' was not declared in this scope
     sum=1;
     ^
0_0_17536092_28596.cpp:8:9: error: 'i' was not declared in this scope
     for(i=0;i<n;i++)
         ^
0_0_17536092_28596.cpp:11:22: error: 'a' was not declared in this scope
          scanf("%d",&a);
                      ^