标签：va printf Question will arg stdarg
stdarg
Question
- How does va_arg (and so on) implemented?
- What will happen if you call printf("%d", char)?
Answer
- Question 1:
- It is not implemented as a user program(not even in libc). It acts as if the C keyword
sizeof. At compiling time, this word will be parsed by the compiler and do something to implement its funciton.
- Question 2:
printf uses va_arg to get all the arguments. If you write %d, then it will assume that the argument is an integer(of type int). This may result in error because content is referenced by pointers.
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From： https://www.cnblogs.com/amazzzzzing/p/18065819