/in/foo.c: In function 'main':
/in/foo.c:5:23: error: expected ';' before 'for'
    5 |         scanf("%d",&n)
      |                       ^
      |                       ;
    6 |         for(i=1;i<=n;i++)
      |         ~~~            
/in/foo.c:4:17: warning: unused variable 'sum' [-Wunused-variable]
    4 |         int i,j,sum,n;
      |                 ^~~
/in/foo.c:4:15: warning: unused variable 'j' [-Wunused-variable]
    4 |         int i,j,sum,n;
      |               ^
/in/foo.c:4:13: warning: unused variable 'i' [-Wunused-variable]
    4 |         int i,j,sum,n;
      |             ^