high.c

来自「linux下的Ｃ语言开发」· C语言 代码 · 共 30 行

/*-*/
/********************************************************
 * Question:						*
 * 	The flag HIGH_SPEED works.			*
 * 	The flag DIRECT_CONNECT does not.		*
 *	Why?						*
 ********************************************************/
/*+*/
#include <stdio.h>

const int HIGH_SPEED = (1<<7);   /* modem is running fast */

/* we are using a hardwired connection */
const int DIRECT_CONNECT = (1<<8);

char flags = 0;         /* start with nothing */

int main()
{
    flags |= HIGH_SPEED;    /* we are running fast */
    flags |= DIRECT_CONNECT;/* because we are wired together */

    if ((flags & HIGH_SPEED) != 0) 
        printf("High speed set\n");

    if ((flags & DIRECT_CONNECT) != 0)
        printf("Direct connect set\n");
    return (0);
}