foo.c: In function 'main':
foo.c:16:20: error: 'x' undeclared (first use in this function)
   16 |                 if(x<=h+30)
      |                    ^
foo.c:16:20: note: each undeclared identifier is reported only once for each function it appears in
foo.c:21:18: warning: format '%d' expects argument of type 'int', but argument 2 has type 'int *' [-Wformat=]
   21 |         printf("%d",&y);
      |                 ~^  ~~
      |                  |  |
      |                  |  int *
      |                  int
      |                 %ls

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