壹、#include<reg51.h>
void delay(unsigned char Xms)//延時Xms
{
int i,j;
for(X = i; X>0; X--)
for(j=110;j>0;j--);
}
void main()
{
P0 = 0x00; //P0.0~P0.7分別接八個發光二極管,剛開始全滅
while(1)
{
delay(1000);
P0 = 0xc0;//點亮前兩個發光二極管P0.0和P0.1;
delay(1000);//延時1秒
P0 = 0x30;//點亮第三個和第四個LED
delay(1000);
P0 = 0x0c;
delay(1000);
P0 = 0x03;
}
}
二、
#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar temp, t0, t1;
bit t2;
sbit P10 = P1^0;
void main()
{
P10 = 1;
temp = 0xfe;
P0 = temp;
P2 = 0xff;
TMOD = 0x01;
TH0 = (65536 - 50000) / 256;
TL0 = (65536 - 50000) % 256;
ET0 = 1;
EA = 1;
TR0 = 1;
while(1);
}
void timer0() interrupt 1
{
TH0 = (65536 - 50000) / 256;
TL0 = (65536 - 50000) % 256;
t0++;
if(t0 == 10) {
t0 = 0;
t1++;
if(t1 == 8) {t1 = 0; t2 = ~t2; P10 = t2;}
temp = _crol_(temp, 1);
if(t2) {P0 = temp; P2 = 255;}
else {P2 = temp; P0 = 255;}
}
}
擴展資料:
例如:a = 3,b = 5,現交換a,b的值,這個問題就好像交換兩個杯子裏面的水,這當然要用到第三個杯子,假如第三個杯子是c,那麽正確的程序為:c = a; a = b; b = c;執行結果是a = 5,b = c = 3如果改變其順序,寫成:a = b; c = a; b =c;則執行結果就變成a = b = c = 5,不能達到預期的目的,初學者最容易犯這種錯誤。
順序結構可以獨立使用構成壹個簡單的完整程序,常見的輸入、計算、輸出三步曲的程序就是順序結構,例如計算圓的面積,其程序的語句順序就是輸入圓的半徑r,計算s = 3.14159*r*r,輸出圓的面積s。
百度百科-c語言