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##### 15.4.1.6 gdb and C

The `set print union` and `show print union` commands apply to the `union` type. When set to ``on`', any `union` that is inside a `struct` or `class` is also printed. Otherwise, it appears as ``{...}`'.

The `@` operator aids in the debugging of dynamic arrays, formed with pointers and a memory allocation function. See Expressions.