/in/foo.c: In function 'main':
/in/foo.c:8:5: error: 'i' undeclared (first use in this function)
    8 | for(i=0;i<n;++i)
      |     ^
/in/foo.c:8:5: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:11:21: error: expected ';' before '}' token
   11 |         sum=sum+part
      |                     ^
      |                     ;
   12 |         }
      |         ~