/in/foo.c: In function 'main':
/in/foo.c:8:2: error: expected ',' or ';' before 'int'
  int x=xmin;
  ^~~
/in/foo.c:9:8: error: 'x' undeclared (first use in this function)
  while(x<=xmax)
        ^
/in/foo.c:9:8: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:12:3: error: expected ';' before 'x'
   x++;
   ^