const.c

来自「C源码集」· C语言 代码 · 共 27 行

#include <stdio.h>

int main (void)
{
	double f = 5000000000.0;
	double g = 5000000000;

	const int DaysinMay = 31;
	/* don't have to mess with L, e, ., etc. if use const */

	/* f prints out OK but g gives overflow value as integer
	constant has been created and is over the max int size */

	printf("f=%f \n", f);
	printf("g=%f \n", g);

	g = 33.3;
	printf("g=%f \n", g);
	// can change the value of a literal constant. It is an lvalue

// DaysInMay = 30;
//	printf("Days in May = %d \n", DaysInMay);

	// but can't change the value of a named constant. It is an rvalue

	return 0;
}