c语言课程设计报告之二叉树演示源程序|c语言程序代码编程小程序设计|c语言课程设计报告课程案例
/********tree2.c二叉树演示********/#include
#include #include #include #include typedef struct TREE{ char data;/*树的结点数据*/ struct TREE *lchild; struct TREE *rchild; int x;/*树的x坐标*/ int y;/*树的y坐标*/}Tree;struct OUTPUT{ int x;/*三种遍历的x坐标*/ int y;/*三种遍历的y坐标*/ int num;}s;int nodeNUM=0;/*统计当前的结点数字,最多26个*/char way;/*自动建立树和手动建立树的标志,2手动,1自动*/char str[3];/*显示结点数据的字符串*/void Init();/*图形初始化*/void Close();/*图形关闭*/Tree *CreatTree();/*文本模式下创建树的过程*/Tree *InitTree(int h,int t,int w);/*创建树,h层次,t横坐标,w树之间的宽度,n树的建立方式*/void DrawTree(Tree *t);/*用图形显示创建好的树*/void Preorder(Tree *t);/*前序遍历*/void Midorder(Tree *t);/*中序遍历*/void Posorder(Tree *t);/*后序遍历*/void DrawNode(Tree *t,int color);/*遍历时显示每个结点的过程*/void ClrScr();/*清空树的区域*/void main(){ Tree *root; randomize(); root=CreatTree();/*创建树*/ Init(); DrawTree(root);/*每次遍历前显示白色的树*/ sleep(1); s.x=100;s.y=300;s.num=1;/*每次遍历前设置显示遍历顺序显示的x,y坐标*/ Preorder(root);/*前序遍历*/ getch(); ClrScr(); DrawTree(root); sleep(1); s.x=100; s.y=350; s.num=1; Midorder(root);/*中序遍历*/ getch(); ClrScr(); DrawTree(root); sleep(1); s.x=100; s.y=400; s.num=1; Posorder(root);/*后序遍历*/ Close();}/*清空树的区域*/void ClrScr(){ setcolor(BLACK); setfillstyle(SOLID_FILL,BLACK); bar(0,20,640,280);}/*文本模式下创建树的过程*/Tree *CreatTree(){ Tree *root; clrscr(); printf("please input n\n"); printf("1.computer creat\n"); printf("2.people creat\n"); way=getch();/*输入创建树的方法,1电脑自动建立,2人工手动建立*/ if(way!='2') way='1';/*其他数字默认自动建立*/ if(way=='2')/*手动建立提示输入结点*/ printf("Please creat the tree\n"); root=InitTree(1,320,150); system("pause"); return root;}/*生成二叉树,h表示层次,t表示横坐标,w表示结点左右子树的宽度,随机数n确定结点是空或非空,如n为0,则为空*,但要限定确保结点数不少于三个*/Tree *InitTree(int h,int t,int w){ char ch; int n;/*自动建立时随机赋值判断是否是NULL的标志*/ Tree *node; if(way=='2')/*手动建立需要自己输入*/ scanf("%c",&ch); else/*自动建立的赋值*/ { n=random(5); if(n==0&&nodeNUM>=3)/*随机赋值时候确保自动建立的二叉树有三个结点*/ ch='.'; else ch=65+random(25); }
if(ch=='.')/*输入空格代表NULL*/ return NULL; else { if(h==6||nodeNUM==26)/*如果树的层次已经到5或者结点树到达26个就自动返回NULL*/ return NULL; node=(Tree*)malloc(sizeof(Tree)); node->data=ch; node->x=t;/*树的x坐标是传递过来的横坐标*/ node->y=h*50;/*树的y坐标与层次大小有关*/ nodeNUM++; node->lchild=InitTree(h+1,t-w,w/2); node->rchild=InitTree(h+1,t+w,w/2); } return node;}/*用图形显示创建好的树*/void DrawTree(Tree *t){ if(t!=NULL) { setcolor(BLACK); setfillstyle(SOLID_FILL,BLACK); fillellipse(t->x,t->y,9,9); setcolor(WHITE); circle(t->x,t->y,10); /*画圆*/ sprintf(str,"%c",t->data);/*将内容转换成字符串输出*/ outtextxy(t->x-3,t->y-2,str); if(t->lchild!=NULL)/*左子树*/ { line(t->x-5,t->y+12,t->lchild->x+5,t->lchild->y-12); DrawTree(t->lchild); } if(t->rchild!=NULL)/*右子树*/ { line(t->x+5,t->y+12,t->rchild->x-5,t->rchild->y-12); DrawTree(t->rchild); } }}/*遍历时显示每个结点的过程*/void DrawNode(Tree *t,int color){ setcolor(YELLOW); setfillstyle(SOLID_FILL,YELLOW); fillellipse(t->x,t->y,10,10); setcolor(RED); sprintf(str,"%c",t->data);/*将内容转换成字符串输出*/ outtextxy(t->x-3,t->y-2,str); setcolor(color); outtextxy(s.x,s.y,str); setcolor(RED); sprintf(str,"%d",s.num);/*将遍历次序用数字显示在树的结点上*/ outtextxy(t->x-3,t->y-20,str); s.num++; sleep(1);}/*前序遍历*/void Preorder(Tree *t){ if(t!=NULL) { s.x+=15; DrawNode(t,GREEN); Preorder(t->lchild); Preorder(t->rchild); }}/*中序遍历*/void Midorder(Tree *t){ if(t!=NULL) { Midorder(t->lchild); s.x+=15; DrawNode(t,YELLOW); Midorder(t->rchild); }}/*后序遍历*/void Posorder(Tree *t){ if(t!=NULL) { Posorder(t->lchild); Posorder(t->rchild); s.x+=15; DrawNode(t,BLUE); }}/*图形初始化*/void Init(){ int gd=DETECT,gm; initgraph(&gd,&gm,"c:\\tc"); cleardevice(); setcolor(YELLOW); outtextxy(250,10,"anykey to continue"); setcolor(RED); outtextxy(20,300,"preorder"); outtextxy(20,350,"midorder"); outtextxy(20,400,"posorder"); getch();}/*图形关闭*/void Close(){ getch(); closegraph();}