/in/foo.c: In function 'Insert':
/in/foo.c:101:6: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(k>n||k<0) 
     ~^~
/in/foo.c:33:8: note: 'k' was declared here
  int i,k;
        ^