12-3-9.c

51单片机开发与应用技术详解(珍藏版)PPT及源码

#include<string.h> 							//头文件
#include<stdio.h>
#include <reg51.h>

void	main(void)			  				//主函数
{
char a;
int b;
long c;

unsigned char x;
unsigned int y;
unsigned long z;

float f,g;
char d, buf [10];
int argsread;

	SCON=0x50;							//串口模式1，允许接收
	TMOD|=0x20;							//初始化T1为定时功能，模式2
	PCON|=0x80;							//设置SMOD=1
	TL1=0xF4;							//波特率4800bit/s，初值
	TH1=0xF4;
	IE|=0x90;								//中断
	TR1=1;								//启动定时器

printf ("Enter a signed byte, int, and long\n");
argsread = scanf ("%bd %d %ld", &a, &b, &c);		//输入整型数据
printf ("%d arguments read.a=%c,b=%d,c=%ld\n", argsread,a,b,c);

printf ("Enter an unsigned byte, int, and long\n");
argsread = scanf ("%bu %u %lu", &x, &y, &z);		//输入无符号型数据
printf ("%d arguments read.x=%c,y=%u,z=%lu\n", argsread,x,y,z);

printf ("Enter a character and a string\n");
argsread = scanf ("%c", &d);					//输入字符
printf ("%d arguments read.d=%c\n", argsread,d);

printf ("Enter a string\n");
argsread = scanf ("%9s",buf);					//输入字符串
printf ("%d arguments read.buf=%s\n", argsread,buf);

printf ("Enter two floating-point numbers\n");
argsread = scanf ("%f %f", &f, &g);				//输入浮点型数据
printf ("%d arguments read.f=%f,g=%f\n", argsread,f,g);
}