[MSX-C] Q&A official thread

It seems really a printf notation problem. If I use %u it prints another value, and if I use %x it prints other one. The most weird questions are:

1. What is the correct modificator?
2. Why they are printed correctly afted a void instruction? Not necessarily a printf(""), I ve tried to call a function that does nothing and it prints ok too after this call.

I suppose that if comparations works fine then its fine, this code works right:

if(x==0) {
    printf("x value is 0");
}

So x is really 0, but doesn't prints right.

#include <stdio.h>

main() {
  TINY x=0;
  TINY y=20;
  printf("%d,%d",x,y)
  if (x==0) {
    printf("Value of x is 0");
  }
}

It prints 2560,2580,Value of x is 0.

#include <stdio.h>

init(){}

main() {
  TINY x=0;
  TINY y=20;
  init();
  printf("%d,%d",x,y)
  if (x==0) {
    printf("Value of x is 0");
  }
}

It prints 0,20,Value of x is 0.

As you can see the printf works fine in second example, however the comparation works fine in boths.

I think the same, it seems a compiler bug. At least the comparations works, so it's fine for me. One question, what compiler do you use? I suposse that you can't use MSX-Library then, right?

I'll post more details later (I have to go to work now), but for now:

TINY is a byte (actually a char), NAT is an unsigned 16-bit word, and REGS is a struct that contains values for the Z80 registers: A, F, HL, BC, DE in two TINYs for A and F, and three NATs for HL, BC and DE. This is not an actual 'window' into the CPU registers, but an 8-byte struct that we use to set the register values when calling BIOS routines.

In TYPE.H:

typedef	char	TINY;

In MSXBIOS.H:

typedef unsigned NAT;

typedef struct _regs {
	TINY	f;
	TINY	a;
	NAT	bc;
	NAT	de;
	NAT	hl;
} REGS;

It makes sense
TINY is char after all