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This is a typo of missing an ampersand. If the author were writing Ada, it would have been a typo of missing a “then”. How is it different?

It's different because in C it changes a boolean comparison to a bitwise one. Is Ada's `and` a bitwise and?

For bool there is no difference between bitwise and and logical and.

There is a difference between short-circuiting and non short-circuiting and, hence the distinct operators.

The equivalent Ada code does not exist as the Ada boolean type only has a logical AND operator (no bitwise operations exist):

Visual Basic also has this distinction (but the keywords are "And" and "AndAlso")