printf format string

[Joe Buck]

> What is the expected output if an argument does not have the appropriate
> types for the string format specified?

A program crash may occur in many cases; in other cases garbage is
printed.

> Is the argument just cast into the correct format, with casting rules
> applied? Or is the output undefined in some cases?

No, no casts occur, because the compiler does not attempt to read and
interpret the format string.