/in/foo.c: In function 'main':
/in/foo.c:9:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0;(z[i]=getchar())!='\n';i++);
  ^~~
/in/foo.c:11:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   if(z[0]=='D')
   ^~
/in/foo.c:34:6: warning: statement with no effect [-Wunused-value]
      for(j;j>i;j--) 
      ^~~