C++利用graphics.h的钟表程序

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#include<graphics.h>#include<iostream>#include<cmath>#include<ctime>#define PI 3.141592653using namespace std;int gettime(){return clock()/CLOCKS_PER_SEC;}void plottime(int h,int m,int s){moveto(200,200);lineto(200+90*cos((90-s*6)*PI/180),200-90*sin((90-s*6)*PI/180));moveto(200,200);lineto(200+70*cos((90-m*6)*PI/180),200-70*sin((90-m*6)*PI/180));moveto(200,200);lineto(200+40*cos((90-h*30)*PI/180),200-40*sin((90-h*30)*PI/180));}void plotfigure(){int x,y;char str[3];circle(200,200,100);for(int i=0;i<12;i++){x=int(200+100*cos((90-i*30)*PI/180));y=int(200-100*sin((90-i*30)*PI/180));circle(x,y,3);sprintf(str,"%d",i==0?12:i);outtextxy(x,y,str);}}int main(){time_t t;int lasttime=0;int nowtime=0;tm *lotime;initgraph(640,480);plotfigure();t=time(0);lotime=localtime(&t);plottime(lotime->tm_hour,lotime->tm_min,lotime->tm_sec);while(1){nowtime=gettime();if(nowtime-lasttime>0){t=time(0);lotime=localtime(&t);cleardevice();plotfigure();plottime(lotime->tm_hour,lotime->tm_min,lotime->tm_sec);lasttime=nowtime;}}getchar();closegraph();return 0;}

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