【程序61】
    題目：打印出楊輝三角形（要求打印出10行如下圖）
    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.程序源代碼：
    main()
    {
     int i, j;
     int a[10][10];
     printf("\n");
     for(i=0; i<10; i++)
     {
     a[i][0] = 1;
     a[i][i] = 1;
     }
     for(i=2;i<10;i++)
     for(j=1;j<10; 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("%5d", a[i][j]);
     printf("\n");
     }
    }
    【程序62】
    題目：學(xué)習(xí)putpixel畫點(diǎn)。
    1.程序分析：
    2.程序源代碼：
    #include "stdio.h"
    #include "graphics.h"
    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】
    題目：畫橢圓ellipse
    1.程序分析：
    2.程序源代碼：
    #include "stdio.h"
    #include "graphics.h"
    #include "conio.h"
    /* 歡迎訪問 C++Builder研究 - www.ccrun.com */
    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】
    題目：利用ellipse and rectangle 畫圖。
    1.程序分析：
    2.程序源代碼：
    #include "stdio.h"
    #include "graphics.h"
    #include "conio.h"
    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】
    題目：一個(gè)美的圖案。
    1.程序分析：
    2.程序源代碼：
    #include "graphics.h"
    #include "math.h"
    #include "dos.h"
    #include "conio.h"
    #include "stdlib.h"
    #include "stdio.h"
    #include "stdarg.h"
    #define MAXPTS 15
    #define PI 3.1415926
    struct PTS
    {
     int x, y;
    };
    /* 63 63 72 75 6E 2E 63 6F 6D */
    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(" MoveTo / LineTo Demonstration" );
     getviewsettings( &vp );
     h = vp.bottom - vp.top;
     w = vp.right - vp.left;
     xcenter = w / 2; /* Determine the center of circle */
     ycenter = h / 2;
     radius = (h - 30) / (AspectRatio * 2);
     step = 360 / MAXPTS; /* Determine # of increments */
     angle = 0; /* Begin at zero degrees */
     for(i=0; i     {
     rads = (double)angle * PI / 180.0; /* Convert angle to radians */
     points[i].x = xcenter + (int)( cos(rads) * radius );
     points[i].y = ycenter - (int)( sin(rads) * radius * AspectRatio );
     angle += step; /* Move to next increment */
     }
     circle( xcenter, ycenter, radius ); /* Draw bounding circle */
     for(i=0; i     {
     for(j=i; j     {
     moveto(points[i].x, points[i].y); /* Move to beginning of cord */
     lineto(points[j].x, points[j].y); /* Draw the cord */
     }
     }
    }
    main()
    {
     int driver, mode;
     driver = CGA; mode = CGAC0;
     initgraph(&driver, &mode, "");
     setcolor(3);
     setbkcolor(GREEN);
     LineToDemo();
    }