12-3-6.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 = 1;								//变量声明并赋初值
int b  = 12345;
long c = 0x7FFFFFFF;

unsigned char x = 'A';
unsigned int y  = 54321;
unsigned long z = 0x5A6F7E00;

float f = 21.0;								//浮点型
float g = 13.64;

char buf [] = "This is test string";				//字符串
char *p = buf;

	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 ("char %bd int %d long %ld\n",a,b,c);		//格式化输出
printf ("Uchar %bu Uint %u Ulong %lu\n",x,y,z);		//格式化输出
printf ("xchar %bx xint %x xlong %lx\n",x,y,z);		//格式化输出
printf ("String %s is at address %p\n",buf,p);		//格式化输出
printf ("%f != %g\n", f, g);						//格式化输出
printf ("%*f != %*g\n", (int)8, f, (int)8, g);			//格式化输出
}