十天学会单片机实例100
*************************************************/
void main(void)
{
unsigned char i;
unsigned char Tab[ ]={0xFF,0xFE,0xFD,0xFB,0xF7,0xEF,0xDF,0xBF,
0x7F,0xBF,0xDF,0xEF,0xF7,0xFB,0xFD,0xFE,
0xFE,0xFC,0xFB,0xF0,0xE0,0xC0,0x80,0x00, 0xE7,0xDB,0xBD,0x7E,0x3C,0x18,0x00,0x81, 0xC3,0xE7,0x7E,0xBD,0xDB,0xE7,0xBD,0xDB}; //流水灯控制码
unsigned char *p; //定义无符号字符型指针
p=Tab; //将数组首地址存入指针p
while(1)
{
for(i=0;i<32;i++) //共32个流水灯控制码
{
P0=*(p+i); //*（p+i)的值等于a[i]
delay150ms(); //调用150ms延时函数
}
}
}
//实例29：用P0 、P1口显示整型函数返回值
#include<reg51.h>
/*************************************************
函数功能：计算两个无符号整数的和
*************************************************/
unsigned int sum(int a,int b)
{
unsigned int s;
s=a+b;
return (s);
}
/*************************************************
函数功能：主函数
*************************************************/
void main(void)
{
unsigned z;
z=sum(2008,2009);
P1=z/256; //取得z的高8位