Error: Conversion to non-scalar type requested

You can’t cast anything to a structure type. What I presume you meant to write is:

dungeon *d1 = (dungeon *)malloc(sizeof(dungeon));

But please don’t cast the return value of malloc() in a C program.

dungeon *d1 = malloc(sizeof(dungeon));

Will work just fine and won’t hide #include bugs from you.

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