foo.c: In function 'main':
foo.c:6:17: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
    6 |         scanf("%d",n);
      |                ~^  ~
      |                 |  |
      |                 |  int
      |                 int *
foo.c:13:13: error: redeclaration of 'num' with no linkage
   13 |         int num[0]=1;
      |             ^~~
foo.c:7:13: note: previous declaration of 'num' with type 'int[n]'
    7 |         int num[n];
      |             ^~~
foo.c:13:20: error: invalid initializer
   13 |         int num[0]=1;
      |                    ^
foo.c:14:13: error: conflicting types for 'num'; have 'int[1]'
   14 |         int num[1]=1;
      |             ^~~
foo.c:13:13: note: previous definition of 'num' with type 'int[0]'
   13 |         int num[0]=1;
      |             ^~~
foo.c:14:20: error: invalid initializer
   14 |         int num[1]=1;
      |                    ^

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