View Compilation Error

0_0_17535890_6861.cpp: In function 'int main()':
0_0_17535890_6861.cpp:4:6: error: expected initializer before '.' token
 int a.n.i.sum;
      ^
0_0_17535890_6861.cpp:5:19: error: 'n' was not declared in this scope
 while(scanf("%d",&n)!=EOF)
                   ^
0_0_17535890_6861.cpp:7:1: error: 'sum' was not declared in this scope
 sum=1
 ^
0_0_17535890_6861.cpp:8:9: error: 'i' was not declared in this scope
 for(i=0;i<n;i++)
         ^