tmemcmp.c

来自「单片及c语言轻松入门的随书光盘」· C语言 代码 · 共 25 行

#include <reg52.h>
#include <string.h>
#include <stdio.h> /*为使用printf函数而加入*/
void tst_memcmp (void) {
	static char hexchars [] = "0123456789ABCDEF";
	static char hexchars2 [] = "0123456789abcdef";
	char i;
	i = memcmp (hexchars, hexchars2, 16);
	if (i < 0)
		printf ("hexchars < hexchars2\n");
	else if (i > 0)
		printf ("hexchars > hexchars2\n");
	else
		printf ("hexchars == hexchars2\n");
}
void main()
{	SCON  = 0x50;    /*SCON:工作模式1，8-bit UART，允许接收*/
	TMOD |= 0x20;    /*TMOD：定时器T1，工作模式2, 8位自动重载方式*/
	TH1   = 0xf3;    /*当波特率为2400时，定时器初值*/
	TR1   = 1;       /*定时器T1开始运行*/
	TI    = 1;       /*允许发送数据*/
	for(;;)
		tst_memcmp();
}