/in/foo.c: In function 'main':
/in/foo.c:10:6: error: 'i' undeclared (first use in this function)
  for(i=0;;i++)
      ^
/in/foo.c:10:6: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:12:11: error: expected expression before ']' token
  paixu(jl[][2],i);
           ^
/in/foo.c:9:11: warning: variable 'jl' set but not used [-Wunused-but-set-variable]
  long int jl[][2]={0};
           ^~