13-1.c

17个C源程序分享

#include <AT89X51.H>
#include <stdio.h>

void main(void)
{
	unsigned int I = 1;
	unsigned int SUM = 0; //设初值

	SCON = 0x50; //串口方式1,允许接收
	TMOD = 0x20; //定时器1定时方式2
	TCON = 0x40; //设定时器1开始计数
	TH1 = 0xE8;	//11.0592MHz 1200波特率
	TL1 = 0xE8;
	TI = 1;
	TR1 = 1; //启动定时器
	
	while(I<=10)
		{
			SUM = I + SUM; //累加
			printf ("%d SUM=%d\n",I,SUM); //显示
			I++;
		}
	while(1); //这句是为了不让程序完后，程序指针继续向下造成程序“跑飞”
}
//最后运行结果是SUM=55;