📄 经典c程序100例==61--70.htm
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<P><FONT color=#ff9933><B><FONT size=5> <FONT
color=#3300cc>经典c程序100例==61--70</FONT></FONT></B></FONT></P>
<P><FONT
color=#990000>【程序61】</FONT><BR>题目：打印出杨辉三角形（要求打印出10行如下图） <BR>1.程序分析：<BR>
1<BR> 1 1<BR> 1 2 1<BR> 1 3
3 1<BR> 1 4 6 4 1<BR> 1 5
10 10 5 1 <BR>2.程序源代码：<BR>main()<BR>{int
i,j;<BR>int
a[10][10];<BR>printf("\n");<BR>for(i=0;i<10;i++)<BR> {a[i][0]=1;<BR> a[i][i]=1;}<BR>for(i=2;i<10;i++)<BR> for(j=1;j<i;j++)<BR> a[i][j]=a[i-1][j-1]+a[i-1][j];<BR>for(i=0;i<10;i++)<BR> {for(j=0;j<=i;j++)<BR> printf("%5d",a[i][j]);<BR> printf("\n");<BR> }<BR>}<BR>==============================================================<BR><FONT
color=#990000>【程序62】</FONT><BR>题目：学习putpixel画点。<BR>1.程序分析： <BR>2.程序源代码：<BR>#include
"stdio.h"<BR>#include
"graphics.h"<BR>main()<BR>{<BR>int
i,j,driver=VGA,mode=VGAHI;<BR>initgraph(&driver,&mode,"");<BR>setbkcolor(YELLOW);<BR>for(i=50;i<=230;i+=20)<BR> for(j=50;j<=230;j++)<BR> putpixel(i,j,1);<BR>for(j=50;j<=230;j+=20)<BR> for(i=50;i<=230;i++)<BR> putpixel(i,j,1);<BR>}<BR>==============================================================<BR><FONT
color=#990000>【程序63】</FONT><BR>题目：画椭圆ellipse <BR>1.程序分析：<BR>2.程序源代码：<BR>#include
"stdio.h"<BR>#include "graphics.h"<BR>#include
"conio.h"<BR>main()<BR>{<BR>int
x=360,y=160,driver=VGA,mode=VGAHI;<BR>int
num=20,i;<BR>int
top,bottom;<BR>initgraph(&driver,&mode,"");<BR>top=y-30;<BR>bottom=y-30;<BR>for(i=0;i<num;i++)<BR>{<BR>ellipse(250,250,0,360,top,bottom);<BR>top-=5;<BR>bottom+=5;<BR>}<BR>getch();<BR>}<BR>==============================================================<BR><FONT
color=#990000>【程序64】</FONT><BR>题目：利用ellipse and
rectangle 画图。<BR>1.程序分析：<BR>2.程序源代码：<BR>#include
"stdio.h"<BR>#include "graphics.h"<BR>#include
"conio.h"<BR>main()<BR>{<BR>int
driver=VGA,mode=VGAHI;<BR>int
i,num=15,top=50;<BR>int
left=20,right=50;<BR>initgraph(&driver,&mode,"");<BR>for(i=0;i<num;i++)<BR>{<BR>ellipse(250,250,0,360,right,left);<BR>ellipse(250,250,0,360,20,top);<BR>rectangle(20-2*i,20-2*i,10*(i+2),10*(i+2));<BR>right+=5;<BR>left+=5;<BR>top+=10;<BR>}<BR>getch();<BR>}<BR>==============================================================<BR><FONT
color=#990000>【程序65】</FONT><BR>题目：一个最优美的图案。 <BR>1.程序分析：<BR>2.程序源代码：<BR>#include
"graphics.h"<BR>#include "math.h"<BR>#include
"dos.h"<BR>#include "conio.h"<BR>#include
"stdlib.h"<BR>#include "stdio.h"<BR>#include
"stdarg.h"<BR>#define MAXPTS 15<BR>#define PI
3.1415926<BR>struct PTS {<BR>int
x,y;<BR>};<BR>double AspectRatio=0.85;<BR>void
LineToDemo(void)<BR>{<BR>struct viewporttype
vp;<BR>struct PTS points[MAXPTS];<BR>int i, j, h,
w, xcenter, ycenter;<BR>int radius, angle,
step;<BR>double rads;<BR>printf(" MoveTo / LineTo
Demonstration" );<BR>getviewsettings( &vp
);<BR>h = vp.bottom - vp.top;<BR>w = vp.right -
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