c语言倒计时怎么编

1、C语言中实现精确计时，参考代码如下：

ANSIC: ftime()

struct timeb {

time_t time;

unsigned short millitm;

short timezone;

short dstflag;

};

2、另外，还有就是更精确定计时，需要CPU的支持，具体情况，可以参考MSDN。

LARGE_INTEGER frequency = {0};

LARGE_INTEGER now = {0};

LARGE_INTEGER end = {0};

QueryPerformanceFrequency(&frequency)；

while (QueryPerformanceCounter(&now) && ((nowQuadPart - endQuadPart) < 0))

{

Sleep(0);

}

你用的是图形界面？

#include <dosh>

#include <timeh>

#include <conioh>

#include <stdioh>

#include <stdlibh>

#include <graphicsh>

struct ViewPort

{

int left;

int top;

int right;

int bottom;

};

struct Point

{

int x;

int y;

};

struct MyTime

{

int Hour;

int Min;

int Sec;

};

struct ViewPort AllSrc; /全屏视口/

struct ViewPort MouseBox={0,0,623,479}; /鼠标能到达的最大视口/

struct ViewPort TimeBox={428,25,600,55}; /时间视口/

struct Point Mouse,lastpos; /鼠标重绘时用，记录鼠标的当前位置和上一位置/

struct MyTime timer;

voidbitmap; /保存鼠标上一位置的位图（除去鼠标本身）/

char ARROR1[]={

/以下是 鼠标箭头 的 16点阵 字模，128 byte ,横向，自己绘制/

0xe0,0x00,

0xfe,0x00,

0xff,0xf0,

0x7f,0xfe,

0x7f,0xf0,

0x7f,0x00,

0x7f,0x00,

0x3f,0x80,

0x39,0xc0,

0x38,0xe0,

0x38,0x70,

0x38,0x38,

0x10,0x1c,

0x10,0x0e,

0x10,0x06,

0x00,0x00

};

void drawHanzi(char mat,int matsize,int x,int y,int color) /从字模点阵数组中获得字模，显示汉字/

/依次：字模指针、点阵大小、起始坐标(x,y)、颜色/

{

int i,j,k,n;

n=(matsize-1)/8+1;

for(j=0;j<matsize;j++)

for(i=0;i<n;i++)

for(k=0;k<8;k++)

if(mat[jn+i]&(0x80>>k)) /测试为1的位则显示/

putpixel(x+i8+k,y+j,color);

}

void MouseSetXY(int x,int y) /设置鼠标的位置/

{

_CX=x;

_DX=y;

_AX=0x04;

geninterrupt(0x33);

Mousex=x;

Mousey=y;

}

void MouseGetXY() /获取鼠标的位置/

{

_AX=0x03;

geninterrupt(0x33);

Mousex=_CX;

Mousey=_DX;

}

int LeftPress() /判断鼠标左键是否被按下/

{

_AX=0x03;

geninterrupt(0x33);

return (_BX&1);

}

int RightPress() /判断鼠标右键是否被按下/

{

_AX=0x03;

geninterrupt(0x33);

return (_BX&2);

}

void SetMouseXRange(int min,int max) /设置鼠标横向坐标范围/

{

_AX=0x07;

_CX=min;

_DX=max;

geninterrupt(0x33);

}

void SetMouseYRange(int min,int max) /设置鼠标纵向坐标范围/

{

_AX=0x08;

_CX=min;

_DX=max;

geninterrupt(0x33);

}

int bFirst=1;

void DrawMouse() /在Mouse对应坐标处绘制鼠标/

{

if(bFirst)

{

bFirst=0;

getimage(Mousex,Mousey,Mousex+15,Mousey+15,bitmap);

drawHanzi(ARROR1,16,Mousex,Mousey,YELLOW);

}

else

{

putimage(lastposx,lastposy,bitmap,COPY_PUT);

getimage(Mousex,Mousey,Mousex+15,Mousey+15,bitmap);

drawHanzi(ARROR1,16,Mousex,Mousey,YELLOW);

}

lastposx=Mousex;

lastposy=Mousey;

}

void HideMouse() /隐藏鼠标/

{

putimage(lastposx,lastposy,bitmap,COPY_PUT);

bFirst=1;

}

void SetViewPort(struct ViewPort p) /设置视口/

{

setviewport(pleft,ptop,pright,pbottom,1);

}

void SetMouseRange(struct ViewPort p)

{

SetMouseXRange(pleft,pright);

SetMouseYRange(ptop,pbottom);

}

void TimeAdd(struct MyTime pt)

{

pt->Sec++;

if(pt->Sec>59)

{

pt->Sec=0;

pt->Min++;

if(pt->Min>59)

{

pt->Min=0;

pt->Hour++;

}

}

}

void FormatTime(char st,struct MyTime t)

{

sprintf(st,"%d:%2d:%2d",tHour,tMin,tSec);

}

void DrawTop()

{

char st[24];

long ti,last=time(NULL);

int starty=5;

int startx=200,endx=418;

struct time tm,lasttm;

struct time tm_click,lasttm_click;

gettime(&lasttm);

while(!kbhit())

{

SetViewPort(AllSrc);

setlinestyle(SOLID_LINE,NULL,THICK_WIDTH);

setfillstyle(0,YELLOW);

MouseGetXY();

gettime(&tm);

if( ((tmti_sec-lasttmti_sec)100+tmti_hund-lasttmti_hund)>10)

{

DrawMouse();

lasttm=tm;

}

ti=time(NULL);

if(ti!=last)

{

SetViewPort(TimeBox);

TimeAdd(&timer);

FormatTime(st,timer);

setcolor(RED);

clearviewport();

outtextxy(2,2,st);

last=ti;

}

}

}

main()

{

int driver,mode;

driver=VGA;

mode=VGAHI;

timerHour=0;

timerMin=0;

timerSec=0;

initgraph(&driver,&mode,"E:\\TC3\\BGI");

AllSrcleft=0;

AllSrctop=0;

bitmap=malloc(imagesize(0,0,15,15));

AllSrcright=getmaxx();

AllSrcbottom=getmaxy();

setbkcolor(LIGHTGRAY);

SetMouseRange(MouseBox);

MouseSetXY(100,100);

SetViewPort(AllSrc);

DrawTop();

closegraph();

return 0;

}

#include<stdioh>#include<timeh>

int main(){ time_t start, end;

int i;

start = time(NULL);

end = time(NULL);

printf("please input:");

for(i = 0; i < 3; i++){

while(end - start < i){

end = time(NULL);

}

cystem("cls");

printf("%d", i);

}

return 0;

}

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