Why this works???

P

pete

Kenny said:
#include <stdio.h>
int main(void) { printf("hello, world\n"); }

I compile it with all warning turned on and it still works fine.

It seems like it shouldn't compile to me.

stdio.h contains this declaration:

int vprintf(const char * restrict format, va_list arg);

and the va_list type isn't defined anywhere in the program.
 

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