2.程序源代码: # define pai 3. # define b 0.809
# include \#include \main() {
int i,j,k,x0,y0,x,y,driver,mode; float a;
driver=cga;mode=cgac0; initgraph(&driver,&mode,\setcolor(3);
setbkcolor(green); x0=150;y0=100; circle(x0,y0,10); circle(x0,y0,20); circle(x0,y0,50); for(i=0;i<16;i++) {
a=(2*pai/16)*i;
x=ceil(x0+48*cos(a)); y=ceil(y0+48*sin(a)*b); setcolor(2); line(x0,y0,x,y);} setcolor(3);circle(x0,y0,60);
/* make 0 time normal size letters */ settextstyle(default_font,horiz_dir,0); outtextxy(10,170,\getch();
setfillstyle(hatch_fill,yellow); floodfill(202,100,white); getch();
for(k=0;k<=500;k++) {
setcolor(3);
for(i=0;i<=16;i++) {
a=(2*pai/16)*i+(2*pai/180)*k; x=ceil(x0+48*cos(a)); y=ceil(y0+48+sin(a)*b); setcolor(2); line(x0,y0,x,y); }
for(j=1;j<=50;j++) {
a=(2*pai/16)*i+(2*pai/180)*k-1;
x=ceil(x0+48*cos(a)); y=ceil(y0+48*sin(a)*b); line(x0,y0,x,y); } }
restorecrtmode(); }
============================================================== 【程序60】
题目:画图,综合例子。 1.程序分析: 2.程序源代码: #include \#define left 0 #define top 0 #define right 639 #define bottom 479 #define lines 400 #define maxcolor 15 main() {
int driver,mode,error; int x1,y1; int x2,y2;
int dx1,dy1,dx2,dy2,i=1; int count=0; int color=0; driver=vga; mode=vgahi;
initgraph(&driver,&mode,\x1=x2=y1=y2=10; dx1=dy1=2; dx2=dy2=3; while(!kbhit()) {
line(x1,y1,x2,y2); x1+=dx1;y1+=dy1; x2+=dx2;y2+dy2; if(x1<=left||x1>=right) dx1=-dx1;
if(y1<=top||y1>=bottom) dy1=-dy1;
if(x2<=left||x2>=right) dx2=-dx2;
if(y2<=top||y2>=bottom) dy2=-dy2; if(++count>lines) {
setcolor(color);
color=(color>=maxcolor)?0:++color; } }
closegraph(); }
【程序61】
题目:打印出杨辉三角形(要求打印出10行如下图) 1.程序分析: 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1
1 5 10 10 5 1 2.程序源代码: main() {int i,j;
int a[10][10]; printf(\
for(i=0;i<10;i++) {a[i][0]=1; a[i][i]=1;} for(i=2;i<10;i++)
for(j=1;j a[i][j]=a[i-1][j-1]+a[i-1][j]; for(i=0;i<10;i++) {for(j=0;j<=i;j++) printf(\ printf(\ } }
============================================================== 【程序62】
题目:学习putpixel画点。
1.程序分析: 2.程序源代码: #include \#include \main()
{
int i,j,driver=vga,mode=vgahi; initgraph(&driver,&mode,\setbkcolor(yellow); for(i=50;i<=230;i+=20) for(j=50;j<=230;j++) putpixel(i,j,1);
for(j=50;j<=230;j+=20) for(i=50;i<=230;i++) putpixel(i,j,1); }
============================================================== 【程序63】
题目:画椭圆ellipse 1.程序分析: 2.程序源代码: #include \#include \#include \main() {
int x=360,y=160,driver=vga,mode=vgahi; int num=20,i; int top,bottom;
initgraph(&driver,&mode,\top=y-30; bottom=y-30; for(i=0;i{
ellipse(250,250,0,360,top,bottom); top-=5; bottom+=5; }
getch(); }
============================================================== 【程序64】
题目:利用ellipse and rectangle 画图。 1.程序分析: 2.程序源代码: #include \#include \#include \main() {
int driver=vga,mode=vgahi; int i,num=15,top=50; int left=20,right=50;
initgraph(&driver,&mode,\for(i=0;i{
ellipse(250,250,0,360,right,left); ellipse(250,250,0,360,20,top);
rectangle(20-2*i,20-2*i,10*(i+2),10*(i+2)); right+=5; left+=5; top+=10; }
getch(); }
============================================================== 【程序65】
题目:一个最优美的图案。 1.程序分析: 2.程序源代码: #include \#include \#include \#include \#include \#include \#include \#define maxpts 15 #define pi 3. struct pts { int x,y; };
double aspectratio=0.85; void linetodemo(void) {
struct viewporttype vp; struct pts points[maxpts]; int i, j, h, w, xcenter, ycenter; int radius, angle, step; double rads;
printf(\getviewsettings( &vp ); h = vp.bottom - vp.top; w = vp.right - vp.left;
xcenter = w / 2; /* determine the center of circle */