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。
分类: 电脑/网络 >>程序设计 >>其他编程语言问题描述:
程序的开头是这样定义的,但是我不知什么意思。希望高手能够不吝赐教。不明白的语句后面标注为“--?”:
#include <graphics.h>
#include <math.h>
#include <dos.h>
#define PI 3.1415926
#define X(a,b,c) x=a*cos(b*c*PI/180-PI/2)+300-- ?
#define Y(a,b,c) y=a*sin(b*c*PI/180-PI/2)+240-- ?
#define d(a,b,c) X(a,b,c)Y(a,b,c)line(300,240,x,y) -- ?
希望明白此语句的朋友能够给出一个详细的解答,以使我能够豁然开朗。在此不胜感激了!
解析:
#include<graphics.h>
#include<math.h>
#include<dos.h>
#define PI 3.1415926
#define x0 320 /*定义钟表中心坐标*/
#define y0 240
void DrawClock(int x,int y,int color) /*画表盘*/
{ int r=150/*表盘的半径*/
float th
setcolor(color)
circle(x,y,r)
circle(x,y,2)
}
void DrawHand(int x,int y,float th,int l,int color)
{
int x1,y1
x1=x l*sin(th)
y1=y-l*cos(th)
setcolor(color)
line(x,y,x1,y1)
}
void main()
{int gdriver=DETECT,gmode
struct time curtime
float th_hour,th_min,th_sec
initgraph(&gdriver,&gmode,"")
setbkcolor(0)
while(! kbhit())
{
DrawClock(x0,y0,14)
gettime(&curtime)/*得到当前系统时间*/
gotoxy(35,20)/*定位输出位置*/
if((float)curtime.ti_hour<=12) /*午前的处理*/
{printf("AM ")
if((float)curtime.ti_hour<10) printf("0")/*十点之前在小时数前加零*/
printf("%.0f:",(float)curtime.ti_hour)
}
else /*午后的处理*/
{printf("PM ")
if((float)curtime.ti_hour-12<10) printf("0")
printf("%.0f:",(float)curtime.ti_hour-12)
}
if((float)curtime.ti_min<10) printf("0")
printf("%.0f:",(float)curtime.ti_min)
if((float)curtime.ti_sec<10) printf("0")
printf("%.0f",(float)curtime.ti_sec)
/*以下三行计算表针转动角度,以竖直向上为起点,顺时针为正*/
th_sec=(float)curtime.ti_sec*0.***********/*2π/60=0.************/
th_min=(float)curtime.ti_min*0.*********** th_sec/60.0
th_hour=(float)curtime.ti_hour*0.*********** th_min/12.0/* 2π/12=0.*********** */
DrawHand(x0,y0,th_hour,70,2)/*画时针*/
DrawHand(x0,y0,th_min,110,3)/*分针*/
DrawHand(x0,y0,th_sec,140,12)/*秒针*/
sleep(1)/*延时一秒后刷新*/
cleardevice()
}
closegraph()
}
能正常运行,我测试过
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