实例代码如下：
#include<graphics.h>
#include<math.h>
#include<stdio.h>
#include<string.h>
#include<conio.h>
#define A 480
#define B 120
main()
{
char q;
int gdriver=VGA,gmode=VGAHI;
int i,cl=0,w=1;
float x,y,v1,v2,a1,a2,L,M,m,k,X,X0,F,F1,F2,g,c,s,G,G1,G2;
float sp=2;
initgraph(&gdriver,&gmode,"");
BG: cleardevice();
setcolor(5);
setbkcolor(0);
settextstyle(3,0,4);
outtextxy(80,50,"Single Pendulum Parameters Input");
setcolor(1);
rectangle(70,50,600,90);
setcolor(2);
rectangle(65,45,605,95);
setcolor(14);
rectangle(60,40,610,100);
setcolor(5);
moveto(100,100);
gotoxy(49,12);printf("");
settextstyle(1,0,2);
outtextxy(80,130,"PLEASE INPUT : ( 0<L<120 )");
setcolor(15);
line(50,160,620,160);
setcolor(5);
outtextxy(80,170,"The Length Of Pendulum L : ");
scanf("%f",&L);
gotoxy(35,15);printf("");
settextstyle(1,0,2);
outtextxy(80,205,"Elastic Coefficient k : ");
gotoxy(40,14);printf("");
scanf("%f",&k);
outtextxy(80,250,"The Quality Of Spherule M :");
gotoxy(50,17);printf("");
scanf("%f",&M);
outtextxy(80,297,"The Quality Of Pedulum Line m : ");
gotoxy(58,20);printf("");
scanf("%f",&m);
setcolor(15);
line(50,380,620,380);
setcolor(5);
outtextxy(60,400,"Press E to Quit AND Press Any Other Key to Go on");
q=getch();
if(q=='e'||q=='E') goto END;
cleardevice();
GN: setcolor(2);
setbkcolor(0);
g=9.8;G=m*g;x=A+L;y=B;v1=0;v2=0;
settextstyle(1,0,3);
outtextxy(380,20,"Single Pendulum");
settextstyle(1,0,1);
outtextxy(390,60,"(with a spherule)");
settextstyle(1,0,3);
outtextxy(20,40,"S-Pendulum Parameters :");
settextstyle(1,0,1);
moveto(100,90);
gotoxy(29,7);printf("%.1f",L);
outtextxy(30,90,"Length of line L :");
gotoxy(30,9);printf("%.2f",k);
outtextxy(30,123,"P-Coefficient k :");
gotoxy(30,11);printf("%.2f",M);
outtextxy(30,156,"Spherule Quality M :");
gotoxy(30,13);printf("%.2f",m);
outtextxy(30,189,"Line Quality m :");
gotoxy(32,15);printf("%d",w);
outtextxy(30,222,"Control Increment w : ");
settextstyle(2,0,6);
outtextxy(25,290,"Exegesis :");
settextstyle(2,0,4);
outtextxy(30,320," Demo Speed : A -- accelerate , S -- decelerate");
outtextxy(30,340," SP-Length : - -- decrease , + -- increase ");
outtextxy(30,360," Coefficient : < -- decrease , > -- increase ");
outtextxy(30,380," Sph-Quality : Z -- decrease , X -- increase ");
outtextxy(30,400,"Line-Quality : C -- decrease , V -- increase ");
outtextxy(30,420," Increment : Q -- decrease , W -- increase ");
outtextxy(30,440," Press R to Reload AND Press E to Quit");
rectangle(20,285,320,460);
责任编辑：小草
