foo.c:3:1: error: unknown type name 'bool'
    3 | bool hw()
      | ^~~~
foo.c: In function 'main':
foo.c:19:30: warning: unused variable 'n' [-Wunused-variable]
   19 |     int zhin,zhiy,zhir,num=0,n=0;
      |                              ^
foo.c:21:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   21 |     scanf("%4d%2d%2d",&qin,&qiy,&qir);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:22:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   22 |     scanf("%4d%2d%2d",&zhin,&zhiy,&zhir);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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