#define as unsigned char

Question

I would like to know how can I tell to compiler that a #define is an unsigned char.

#define SET_BITS_LOW 0x80

Here SET_BITS_LOW is, by default, an int but I want an unsigned char

`#define SET_BITS_LOW ((unsigned char)0x80)`? – Morwenn Mar 07 '14 at 10:48 — Morwenn, Mar 07 '14 at 10:48
It will be promoted to `int` in most contexts anyway. – Brave Sir Robin Mar 07 '14 at 10:55 — Brave Sir Robin, Mar 07 '14 at 10:55
@rmartinjak Can you explain it please. – VivienG Mar 07 '14 at 10:57 — VivienG, Mar 07 '14 at 10:57

score 7 · Accepted Answer · answered Mar 07 '14 at 10:49

7

You may try like this:

#define SET_BITS_LOW  ((unsigned char)0x80)

answered Mar 07 '14 at 10:49

Rahul Tripathi

You will get a compilation warning of: conversion to 'unsigned char' from 'int' may alter its value – Ofer Orgal May 12 '22 at 07:55

1 Answers1