c语言怎么样编写一个时钟程序

c语言时钟程序代码如下：

#include<windows.h>

#include<math.h>

#define ID_TIMER 1//计时器ID

#define TWOPI (2*3.14159)

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM)

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR szCmdLine,int iCmdShow)

{

static TCHAR szAppName[]=TEXT("Clock")

HWND hwnd

MSG msg

WNDCLASS wndclass

wndclass.cbClsExtra=0

wndclass.cbWndExtra=0

wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH)

wndclass.hCursor=LoadCursor(NULL,IDC_ARROW)

wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION)

wndclass.hInstance=hInstance

wndclass.lpfnWndProc=WndProc

wndclass.lpszClassName=szAppName

wndclass.lpszMenuName=NULL

wndclass.style=CS_HREDRAW|CS_VREDRAW

if(!RegisterClass(&wndclass))

{

MessageBox(NULL,TEXT("This program requires Windows

T"),szAppName,MB_ICONERROR)

return 0

}

hwnd=CreateWindow(szAppName,TEXT("Analog Clock"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL)

ShowWindow(hwnd,iCmdShow)

UpdateWindow(hwnd)

while(GetMessage(&msg,NULL,0,0))

{

TranslateMessage(&msg)

DispatchMessage(&msg)

}

return msg.wParam

}

void Setsotropic(HDC hdc,int cxClient,int cyClient)

{

SetMapMode(hdc,MM_ISOTROPIC)

SetWindowExtEx(hdc,1000,1000,NULL)

SetViewportExtEx(hdc,cxClient/2,-cyClient/2,NULL)

SetViewportOrgEx(hdc,cxClient/2,cyClient/2,NULL)

}

void RotatePoint(POINT pt[],int iNum,int iAngle)

{

int i

POINT ptTemp

for(i=0i<iNumi++)

{

ptTemp.x=(int)(pt[i].x*cos(TWOPI*iAngle/360)+pt[i].y*sin(TWOPI*iAngle/360))

ptTemp.y=(int)(pt[i].y*cos(TWOPI*iAngle/360)+pt[i].x*sin(TWOPI*iAngle/360))

pt[i]=ptTemp

}

}

void DrawClock(HDC hdc)

{

int iAngle

POINT pt[3]

for(iAngle=0iAngle<360iAngle+=6)

{

pt[0].x=0

pt[0].y=900

RotatePoint(pt,1,iAngle)

pt[2].x=pt[2].y=iAngle%5?33:100

pt[0].x-=pt[2].x/2

pt[0].y-=pt[2].y/2

pt[1].x=pt[0].x+pt[2].x

pt[1].y=pt[0].y+pt[2].y

SelectObject(hdc,GetStockObject(BLACK_BRUSH))

Ellipse(hdc,pt[0].x,pt[0].y,pt[1].x,pt[1].y )

}

}

void DrawHands(HDC hdc,SYSTEMTIME *pst,BOOL fChange)

{

static POINT pt[3][5]={0,-150,100,0,0,600,-100,0,0,-150, 0,-200,50,0,0,800,-50,0,0,-200, 0,0,0,0,0,0,0,0,0,800 }

int i,iAngle[3]

POINT ptTemp[3][5]

iAngle[0]=(pst->wHour*30)%360+pst->wMinute/2

iAngle[1]=pst->wMinute*6

iAngle[2]=pst->wSecond*6

memcpy(ptTemp,pt,sizeof(pt))

for(i=fChange?0:2i<3i++)

{

RotatePoint(ptTemp[i],5,iAngle[i])

Polyline(hdc,ptTemp[i],5)

}

}

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)

{

static int cxClient,cyClient

static SYSTEMTIME stPrevious

BOOL fChange

HDC hdc

PAINTSTRUCT ps

SYSTEMTIME st

switch(message)

{

case WM_CREATE:

SetTimer(hwnd,ID_TIMER,1000,NULL)

GetLocalTime(&st)

stPrevious=st

return 0

case WM_SIZE:

cxClient=LOWORD(lParam)

cyClient=HIWORD(lParam)

return 0

case WM_TIMER:

GetLocalTime(&st)

fChange=st.wHour!=stPrevious.wHour||st.wMinute!=stPrevious.wMinute

hdc=GetDC(hwnd)

Setsotropic(hdc,cxClient,cyClient)

SelectObject(hdc,GetStockObject(WHITE_PEN))

DrawHands(hdc,&stPrevious,fChange)

SelectObject(hdc,GetStockObject(BLACK_PEN))

DrawHands(hdc,&st,TRUE)

stPrevious=st

return 0

case WM_PAINT:

hdc=BeginPaint(hwnd,&ps)

Setsotropic(hdc,cxClient,cyClient)

DrawClock(hdc)

DrawHands(hdc,&stPrevious,TRUE)

EndPaint(hwnd,&ps)

return 0

case WM_DESTROY:

KillTimer(hwnd,ID_TIMER)

PostQuitMessage(0)

return 0

}

return DefWindowProc(hwnd,message,wParam,lParam)

}

C语言是一门通用计算机编程语言，应用广泛。C语言的设计目标是提供一种能以简易的方式编译、处理低级存储器、产生少量的机器码以及不需要任何运行环境支持便能运行的编程语言。尽管C语言提供了许多低级处理的功能，但仍然保持着良好跨平台的特性，以一个标准规格写出的C语言程序可在许多电脑平台上进行编译，甚至包含一些嵌入式处理器（单片机或称MCU）以及超级电脑等作业平台。

C语言是由UNIX的研制者丹尼斯·里奇（Dennis Ritchie）于1970年 由 肯·汤普逊（Ken Thompson）所研制出的B语言的基础上发展和完善起来的。目前，C语言编译器普遍存在于各种不同的 *** 作系统中，例如UNIX、MS-DOS、Microsoft Windows及Linux等。C语言的设计影响了许多后来的编程语言，例如C++、Objective-C、Java、C#等。

下面的程序就是用AT89C2051做的数字式时钟，数码管显示，具有闹钟功能，整点报时，几点蜂鸣器响几下，晚上九点到第二天早上六点整点不报时。给你参考一下吧。

#include<AT89X051.h>

#include<intrins.h>

#define uint unsigned int

#define uchar unsigned char

sbit sda=P3^1

sbit scl=P3^0

sbit key1=P1^7

sbit key2=P1^6

sbit key3=P1^5

sbit kz=P3^5

sbit bs=P3^4

char shi=12,fen=12,ke1,mm,mi,nh,nf,mn,mms,baos,a

bit ms,nt,b

uchar code SEG8[]={ 0x50,0x5F,0x94,0x15,0x1B,

0x31,0x30,0x57,0x10,0x11,

0x40,0x4F,0x84,0x05,0x0B,

0x21,0x20,0x47,0x00,0x01,

0x21,0xa2,0x52,0xff}

//0-9,0.-9.s.,f.,n 暗

void delay1ms(uchar ms)

{

uchar i

while(ms--)

{

for(i = 0i<250i++)

{

_nop_()

_nop_()

_nop_()

_nop_()

}

}

}

void display(char numh,char numf)

{

uchar qian,bai,sh,ge

if(ke1==1)

qian=20

else if(ke1==2)

qian=21

else if((ke1==3)||(ke1==4))

qian=22

else if(ke1==0)

qian=numh/10

if((ke1==1)||(ke1==2))

bai=23

else if(ke1==3)

bai=20

else if(ke1==4)

bai=21

else if(ke1==0)

{

bai=numh%10

if(ms)

bai=bai+10

}

if((ke1==1)||(ke1==3))

{sh=numh/10ge=numh%10}

else if((ke1==2)||(ke1==4)||(ke1==0))

{sh=numf/10ge=numf%10}

P1=SEG8[qian]

P3_3=0delay1ms(2)P3_3=1

P1=SEG8[bai]

P3_7=0delay1ms(2)P3_7=1

P1=SEG8[sh]

P3_2=0delay1ms(2)P3_2=1

P1=SEG8[ge]

P3_0=0delay1ms(2)P3_0=1

}

///////////x24c02//////////////////

void delay24()

{ }

void init24c02() //初始化

{

sda=1

delay24()

scl=1

delay24()

}

void start2() //开始信号

{

sda=1

delay24()

scl=1

delay24()

sda=0

delay24()

}

void stop() //停止

{

sda=0

delay24()

scl=1

delay24()

sda=1

delay24()

}

void respons() //应答

{

uchar i

scl=1

delay24()

while((sda==1)&&(i<250))i++

scl=0

delay24()

}

void write_byte(char date) // 写数据子函数

{

uchar i,temp

temp=date

for(i=0i<8i++)

{

temp=temp<<1

scl=0

delay24()

sda=CY

delay24()

scl=1

delay24()

}

scl=0

delay24()

sda=1

delay24()

}

uchar read_byte() // 读数据子函数

{

uchar i,k

scl=0

delay24()

sda=1

delay24()

for(i=0i<8i++)

{

scl=1

delay24()

k=(k<<1)|sda

scl=0

delay24()

}

return k

}

///////写数据函数///////////////////

void write_add(uchar address,char date)

{

start2()

write_byte(0xa0)

respons()

write_byte(address)

respons()

write_byte(date)

respons()

stop()

}

char read_add(uchar address) //读数据函数

{

uchar date

start2()

write_byte(0xa0)

respons()

write_byte(address)

respons()

start2()

write_byte(0xa1)

respons()

date=read_byte()

stop()

return date

}

void keyf(char *con,char up,char don)

{

uint i

for(i=0i<800i++)

{

if((ke1==1)||(ke1==2))

display(shi,fen)

else if((ke1==3)||(ke1==4))

display(nh,nf)

P1=0xff

if(key1==0)

{

delay1ms(10)

if(key1==0)

{

ke1++

if(ke1>=5)

ke1=0

while(!key1)

break

}

}

if(key2==0)

{

delay1ms(10)

if(key2==0)

{

i=0

*con+=1

if(*con>up)

*con=0

while(!key2)

}

}

if(key3==0)

{

delay1ms(10)

if(key3==0)

{

i=0

*con-=1

if(*con<don)

*con=up

while(!key3)

}

}

}

}

void key()

{

P1=0xff

if(key1==0)

{

EA=0

delay1ms(20)

if(key1==0)

{

ke1++

if(ke1>=5)

ke1=0

while(!key1)

}

if(ke1==1)

{

keyf(&shi,23,0)

}

if(ke1==2)

{

keyf(&fen,59,0)

}

if(ke1==3)

{

keyf(&nh,23,0)

}

if(ke1==4)

{

keyf(&nf,59,0)

}

P1=0xffP3=0xff

write_add(0x01,nh)

delay1ms(5)

write_add(0x03,nf)

ke1=0

EA=1

}

}

void Timer0Init(void)

{

TMOD |= 0x01

TL0 = 0xB0

TH0 = 0x3C

TF0 = 0

TR0 = 1

EA=1

ET0=1

}

void main()

{

P1=0xff

P3=0xff

init24c02()

nh=read_add(0x01)

delay1ms(50)

nf=read_add(0x03)

delay1ms(50)

Timer0Init()

while(1)

{

key()

display(shi,fen)

}

}

void tim0 ()interrupt 1

{

TH0=0X3C

TL0=0XB0

if(++mms>=10)

{

mms=0

ms=!ms

}

if(++mm>=20)

{

mm=0

if(++mi>=60)

{

mi=0

if(++fen>=60)

{

fen=0

if(++shi>=24)

shi=0

}

}

}

if(fen==0)

{

if((shi>=7)&&(shi<=20))

{

if((baos==0)&&(b==0))

{

baos=shi

baos=baos*2

b=1

}

if(++a==10)

{

a=0

if(--baos!=0)

{

bs=!bs

}

else

{

bs=1

}

}

}

}

else

b=0

if(nh==shi)

{

if(nf==fen)

{

if(nt==0)

{

P1=0xff

if(++mn==10)

{

mn=0

kz=!kz

}

if(key3==0)

{

nt=1

kz=1

}

}

}

else

{

nt=0

kz=1

}

}

}

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