/in/foo.cc: In function 'int main()':
/in/foo.cc:5:11: warning: unused variable 'sum' [-Wunused-variable]
     int n,sum=0;
           ^~~
/in/foo.cc: At global scope:
/in/foo.cc:7:4: error: expected unqualified-id before 'for'
 }  for(int i=1;i<=n;i++)
    ^~~
/in/foo.cc:7:16: error: 'i' does not name a type
 }  for(int i=1;i<=n;i++)
                ^
/in/foo.cc:7:21: error: 'i' does not name a type
 }  for(int i=1;i<=n;i++)
                     ^