用c语言编写一个程序，输出下列雪花图案！

#include "枣郑stdio.h"

#define ROW 14

#define COL 12

int main()

{

char ch[ROW][COL] //多定义一行一档岩漏列，0行和0列不用

int i,j

for(i=0i<ROWi++)

for(j=0j<COLj++)

ch[i][j]=' ' //初始化为空格

ch[1][4]=ch[13][4]='*'

for(i=2i<=8i+=2)

{

ch[3][i]='*'

ch[11][i]='*'

}

for(i=3i<=7i+=2)

{

ch[5][i]='行烂*'

ch[9][i]='*'

}

for(i=1i<=11i+=2)

{

ch[7][i]='*'

}

printf("  ")

for(i=1i<COLi++)

printf(" %d",i)

printf("\n")

for(i=1i<ROWi++)

{

printf("%-2d",i)

for(j=1j<COLj++)

{

printf(" %c",ch[i][j])

}

printf("\n")

}

return 0

}

#include<iostream.h>

#include <windows.h>

#include <math.h>

#include <没乎stdlib.h>

#define ID_TIMER1

#define SNOWNUM 500 // 雪花数量

#define CONTRAST50// 对比度

#define YSTART 5// 用于确定雪花初始时的y坐标

#define SNOWCR RGB(0xFF, 0xFF, 0xFF) //雪花的颜色—白色

#define SNOWGATHERCR RGB(0xDB, 0xDB, 0xFF) //堆积雪花的颜野梁色

typedef struct tagSnow

{

POINT ptSnowsPos[SNOWNUM]//用于保存各个雪花的坐标

COLORREF crOrg[SNOWNUM]//用于画雪花前屏幕原来的颜色

int iVx, iVy, iAllVx, iAllVy

}Snow

void initSnow(HDC hdc, Snow *sn, int iSnow, int cxScreen)

int GetContrast(HDC hdc, Snow *sn, int iSnow)

void drawSnow(HDC hdc, Snow *sn, int cxScreen)

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{

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

HWNDhwnd

MSGmsg

WNDCLASSwndclass

wndclass.style= CS_HREDRAW | CS_VREDRAW

wndclass.lpfnWndProc = WndProc

wndclass.cbClsExtra= 0

wndclass.cbWndExtra= 0

wndclass.hInstance= hInstance

wndclass.hIcon= LoadIcon (NULL, IDI_APPLICATION)

wndclass.hCursor = LoadCursor (NULL, IDC_ARROW)

wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH)

wndclass.lpszMenuName = NULL

wndclass.lpszClassName = szAppName

if(!RegisterClass (&wndclass))

{

MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR)

return 0

}

hwnd = CreateWindow (szAppName,TEXT ("桌面下雪枯脊悉"),

WS_MINIMIZEBOX | WS_SYSMENU,

CW_USEDEFAULT, CW_USEDEFAULT,

240, 120,

NULL, NULL, hInstance, NULL)

ShowWindow (hwnd, iCmdShow)

UpdateWindow (hwnd)

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

{

TranslateMessage (&msg)

DispatchMessage (&msg)

}

return msg.wParam

}

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

{

HDC hdc

PAINTSTRUCT ps

RECTrect

static int cxScreen, cyScreen//屏幕宽高度(单位:像素)

static int iTimes, iLoopTimes=100

static Snow snowDream

int i

switch (message)

{

case WM_CREATE:

cxScreen = GetSystemMetrics (SM_CXSCREEN)

cyScreen = GetSystemMetrics (SM_CYSCREEN)

srand ((int) GetCurrentTime ()) //初始化随机数发生器

snowDream.iAllVx = (unsigned)rand()%3 - 1//雪花总体水平飘行速度(-1,0,1)

snowDream.iAllVy = (unsigned)rand()%2 + 1//雪花总体垂直下落速度(1,2)

hdc = GetDC(NULL)//检索整个屏幕的设备上下文环境

for(i=0i <SNOWNUMi++)

{

snowDream.ptSnowsPos[i].x = rand() % cxScreen//一个雪花开始下落的x坐标

snowDream.ptSnowsPos[i].y = rand() % YSTART//一个雪花开始下落的y坐标

snowDream.crOrg[i] = GetPixel(hdc, snowDream.ptSnowsPos[i].x,

snowDream.ptSnowsPos[i].y)//获取给定点的原来的颜色值

}

ReleaseDC(NULL, hdc)

SetTimer(hwnd, ID_TIMER, 10, NULL)//定时器，10毫秒

return 0

case WM_DISPLAYCHANGE: //当显示分辨率改变的时候

cxScreen = GetSystemMetrics (SM_CXSCREEN)

cyScreen = GetSystemMetrics (SM_CYSCREEN)

return 0

case WM_TIMER:

hdc = GetDC(NULL)//检索整个屏幕的设备上下文环境

if(iTimes >iLoopTimes)

{

iTimes = 0

iLoopTimes = 50 + (unsigned)rand()%50

if(snowDream.iAllVx != 0)

snowDream.iAllVx = 0

else

snowDream.iAllVx = (unsigned)rand()%3 - 1//雪花总体水平飘行速度(-1,0,1)

snowDream.iAllVy = (unsigned)rand()%2 + 1//雪花总体垂直下落速度(1,2)

}

else

iTimes++

drawSnow(hdc, &snowDream, cxScreen)

ReleaseDC(NULL, hdc)

return 0

case WM_PAINT:

hdc = BeginPaint (hwnd, &ps)

GetClientRect (hwnd, &rect)

DrawText (hdc, TEXT ("桌面下雪!"), -1, &rect,

DT_SINGLELINE | DT_CENTER | DT_VCENTER)

EndPaint (hwnd, &ps)

return 0

case WM_DESTROY:

KillTimer(hwnd, ID_TIMER)// 中止定时器

InvalidateRect(NULL, NULL, TRUE)// 刷新桌面

PostQuitMessage (0)

return 0

}

return DefWindowProc (hwnd, message, wParam, lParam)

}

void initSnow(HDC hdc, Snow *sn, int iSnow, int cxScreen) //初始化第iSnow个雪花

{

sn->ptSnowsPos[iSnow].x = (unsigned)rand() % cxScreen//x范围整个屏幕宽

sn->ptSnowsPos[iSnow].y = (unsigned)rand() % YSTART//y范围离屏幕顶部YSTART像素点以内

sn->crOrg[iSnow] = GetPixel(hdc, sn->ptSnowsPos[iSnow].x,

sn->ptSnowsPos[iSnow].y ) //获取给定点的原来的颜色值

}

int GetContrast(HDC hdc, Snow *sn, int iSnow)

{

int iR, iG, iB

COLORREF crCmp

if(0 == sn->iVx) //若水平速度为0，则取比其大一个像素的正下方的点

crCmp = GetPixel(hdc, sn->ptSnowsPos[iSnow].x, sn->ptSnowsPos[iSnow].y + 1)

else //若水平速度>0，取右下方的点。 <0则取左下方的点

crCmp = GetPixel(hdc, sn->ptSnowsPos[iSnow].x + (sn->iVx>0?1:-1), sn->ptSnowsPos[iSnow].y + 1)

if(crCmp==SNOWCR) //如果为雪花的颜色

return 0

//分别获取crCmp与对比点的蓝、绿、红部分的差值

iB = abs((crCmp>>16)&0xFF - (sn->crOrg[iSnow]>>16)&0xFF)

iG = abs((crCmp>>8)&0xFF - (sn->crOrg[iSnow]>>8)&0xFF)

iR = abs((crCmp)&0xFF- (sn->crOrg[iSnow])&0xFF)

return (iR+iG+iB)/3

}

void drawSnow(HDC hdc, Snow *sn, int cxScreen)

{

int i

for(i=0i <SNOWNUMi++)

{

//如果保存的原来的颜色不是雪花的颜色

if(sn->crOrg[i] != SNOWCR)

SetPixel(hdc, sn->ptSnowsPos[i].x, sn->ptSnowsPos[i].y,

sn->crOrg[i])//还原上一个位置的颜色

sn->iVx = sn->iAllVx*(i%3+1)//雪花的x飘动速度

sn->iVy = sn->iAllVy*(i%3+1)//雪花的y飘动速度

//rand()%5-2使雪花下落的时候 有抖动效果

sn->ptSnowsPos[i].x += sn->iVx+rand()%5-2//雪花的下一个x坐标

sn->ptSnowsPos[i].y += sn->iVy+1//雪花的下一个y坐标

//获取给定点的原来的颜色值

sn->crOrg[i] = GetPixel(hdc, sn->ptSnowsPos[i].x, sn->ptSnowsPos[i].y)

if(CLR_INVALID == sn->crOrg[i]) //如果获取颜色失败,即雪花飘出了屏幕

{

initSnow(hdc, sn, i, cxScreen)//重新初始化 雪花

continue

}

if(sn->crOrg[i] != SNOWCR) //若当前点的颜色 不等于 雪花的颜色

{

if(SNOWGATHERCR == sn->crOrg[i]) //当前点的颜色=堆积的雪的颜色

{ //设置为雪花的颜色

SetPixel(hdc, sn->ptSnowsPos[i].x, sn->ptSnowsPos[i].y, SNOWCR)

sn->crOrg[i] = SNOWCR

//initSnow(hdc, sn, i, cxScreen)//重新初始化 雪花

}

else if(GetContrast(hdc, sn, i) >50) //若对比度>50

{ //堆积雪花

SetPixel(hdc, sn->ptSnowsPos[i].x, sn->ptSnowsPos[i].y, SNOWGATHERCR)

SetPixel(hdc, sn->ptSnowsPos[i].x-1, sn->ptSnowsPos[i].y+1, SNOWGATHERCR)

SetPixel(hdc, sn->ptSnowsPos[i].x+1, sn->ptSnowsPos[i].y+1, SNOWGATHERCR)

initSnow(hdc, sn, i, cxScreen)//重新初始化 雪花

}

else //对比度 <50,不堆积,画出这帧雪花.等下次的时候再还原此点原本的颜色.以产生飘动效果

SetPixel(hdc, sn->ptSnowsPos[i].x, sn->ptSnowsPos[i].y, SNOWCR)

}

}

这是我根据网上的修改的桌面下雪的程序，在vc6.0上新建win32可也运行，希望对你有点帮助

}

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