foo.c: In function 'main':
foo.c:16:25: error: expected expression before 'int'
   16 |                         int i=2;
      |                         ^~~
foo.c:15:17: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   15 |                 else
      |                 ^~~~
foo.c:17:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   17 |                         printf("1 1 ");
      |                         ^~~~~~
foo.c:18:31: error: 'i' undeclared (first use in this function)
   18 |                         while(i<=n)
      |                               ^
foo.c:18:31: note: each undeclared identifier is reported only once for each function it appears in

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