使 C 源代码中的大常量更具可读性? [英] Making large constants in C source more readable?
问题描述
I'm working on some code for a microprocessor.
It has a few large, critical constants.
#define F_CPU 16000000UL
In this case, this is the CPU frequency. In Hertz.
As it is, it's rather hard to tell if that's 1,600,000, 160,000,000 or 16,000,000 without manually tabbing a cursor across the digits.
If I put commas in the number #define F_CPU 16,000,000UL
, it truncates the constant.
I've worked with a few esoteric languages that have a specific digit-separator character, intended to make large numbers more readable (ex 16_000_000
, mostly in languages intended for MCUs). Large "magic numbers" are rather common in embedded stuff, as they are needed to describe aspects of how a MCU talks to the real world.
Is there anything like this in C?
One possibility is to write it like that:
#define F_CPU (16 * 1000 * 1000)
alternatively
#define MHz (1000*1000)
#define F_CPU (16 * MHz)
Edit: The MHz(x) others suggested might be nicer
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