C 二叉树基本操作

/*二叉数的基本操作*/

#include

struct tree
{
    int data;
    struct tree *left;
    struct tree *right;
};

typedef struct tree treenode;
typedef treenode *b_tree;

b_tree creat()
{
    char ch;
    b_tree newnode;

    ch=getchar();
    if (ch==' ') return(NULL);
    else
    {   newnode=(b_tree)malloc(sizeof(treenode));
        newnode->data=ch;
        newnode->left=creat(newnode);
        newnode->right=creat(newnode);
     }
     return newnode;
}

void front_print(b_tree root)
{
    if(root!=NULL)
    {
        printf("[%c]",root->data);
        front_print(root->left);
        front_print(root->right);
     }
}

void middle_print(b_tree root)
{

    if(root!=NULL)
    {
        middle_print(root->left);
        printf("[%c]",root->data);
        middle_print(root->right);
     }
}

void back_print(b_tree root)
{
    if(root!=NULL)
    {
        back_print(root->left);
        back_print(root->right);
        printf("[%c]",root->data);
     }
}

int countleaf(b_tree root,int *i)
{
    if(root==NULL)
        return 0;
    else
    {
        if((root->left==NULL)&&(root->right==NULL))
             (*i)++;
        countleaf(root->left,i);
        countleaf(root->right,i);
        return *i;
     }
}

int locate(b_tree root,char x)
{

    if(root==NULL)
        return 0;
    else
    {
        if(root->data==x)
            printf("\nSuccess!You research data is %c",x);
        locate(root->left,x);
        locate(root->right,x);
    }
}

int t_depth(b_tree root)
{
    int dep1,dep2;
    if(root==NULL)
        return 0;
    else
    {
        dep1=t_depth(root->left);
        dep2=t_depth(root->right);
        if(dep1>dep2)
            return(dep1+1);
        else
            return(dep2+1);
     }
}

void main()
{
    b_tree root=NULL;
    char x;
    int select;
    int depth=0;
    int *i=0;
    int j;

    printf("Please set up a tree.\n");
    printf("Notice:if no have crunode please input blank!!!\n");
    root=creat();

    do
    {
        printf("\n(1) Show the tree in a front-root order.");
        printf("\n(2) Show the tree in a middle-root order.");
        printf("\n(3) Show the tree in a back-root order.");
        printf("\n(4) Show the the leafage number of tree.");
        printf("\n(5) Locate a data in the tree.");
        printf("\n(6) Show the depth of the tree.");
        printf("\n(7) Exit");
        printf("\nPlease select one:");
        scanf("%d",&select);

        switch(select)
        {
            case 1: printf("\nThe tree is :");
                    front_print(root);
                    break;

            case 2: printf("\nThe tree is :");
                    middle_print(root);
                    break;

            case 3: printf("\nThe tree is :");
                    back_print(root);
                    break;
           
            case 4: *i=countleaf(root,i);
                    printf("\nThe tree have %d leafage.\n",*i);
                    *i=0;
                    break;

            case 5: getchar();
                    printf("Please input the data you want to research: ");
                    x=getchar();
                    locate(root,x);
                    break;

            case 6: depth=t_depth(root);
                    printf("The depth of the tree is %d.\n",depth);

                    break;

 

            case 7:
                    break;
        }
    }
    while(select<7);
    printf("\n Press any key to quit...");
    getch();
}