/in/foo.c: In function 'main':
/in/foo.c:6:12: error: expected ';' before 'for'
    6 |    {  sum=0
      |            ^
      |            ;
    7 |          for(j=i;j<=i;j++)
      |          ~~~
/in/foo.c:3:14: warning: unused variable 'j' [-Wunused-variable]
    3 | {int n,i,sum,j;
      |              ^