【c++、数据结构课设】哈夫曼树-编程知识

时间过的真快，转眼之间一个学期即将结束，想必这个时候大家都在准备各科的课设作业，本期内容是我的数据结构课设，希望能给大家带来帮助，如果有任何不足或需要改进的地方，欢迎各位提出宝贵的意见。

屏幕录制2023-12-24 13.43.01

课设要求

哈夫曼树应用题目描述及功能要求

从文件 Text.txt 中读取一大段文字(字符)，统计其中不同字符出现频度(百分比)，将这些字符以及对应频度统计结果存于文件 Freq.txt 中。从 Freq.txt 文件中读取频度并按此频度创建哈夫曼树。
建立哈夫曼树并将它存于文件HuffTree.txt中(以顺序存储方式，结点结构(权值，双亲，左，右). 将已在内存中的哈夫曼树以直观的方式(比如树)显示在终端上;(可以以树的凹入表示法在屏幕上显示哈夫曼树)。
利用已经建好的哈夫曼树(如不在内存，则从文件 HuffTree.txt 中读入)，给各字符进行哈夫曼编码，并将编码结果存于另一个文件 HuffCode.txt 中。
输出该哈夫曼树的 WPL 值。
从键盘另外输入一段字符，所出现的字符，将输入的正文内容进行哈夫曼编码，如果某字符并没有在哈夫曼编码表中，则该字符原样不变，若存在则进行二进制编码替换，将所得编码结果也保存在文件 HuffEncoding.txt 中，同时也显示在终端上。
将二进制编码的结果从文件 HuffEncoding.txt 中读出再进行解码，显示出第 5 步中输入的那段字符。

过程

1.数据结构

因为每个字符只能是哈夫曼树的叶子结点，所以要标记一下叶子结点。


typedef struct node {//权重int weight;//左右孩子,双亲node *lchild, *rchild, *parent;//叶子结点标志 false 叶子结点 true 非叶子结点bool flag;
} HuffmanNode;typedef struct tree {//根结点HuffmanNode *head;//叶子结点个数int count;
} HuffmanTree;//叶子结点数组
HuffmanNode *CH[26];//哈夫曼编码结果
int HuffmanCode[26];//WPL
int W;//每个字符的权重
int weight[26];//权重总和
int total;//标记元素是否已经在哈夫曼树上
int status[26];//每个字符的哈夫曼编码
int HuffmanCodes[26][26];//
HuffmanTree *tree = new HuffmanTree;

2.主要函数

菜单


void menu() {cout << "-----------------------------------------------------------------------" << endl;cout << "|                                                                      |" << endl;cout << "|                            欢 迎 回 来                                 |" << endl;cout << "|                                                                      |" << endl;cout << "-----------------------------------------------------------------------" << endl;cout << endl;while (true) {int op;cout << "* 1.哈夫曼树的应用" << endl << "* 2.退出" << endl;cin >> op;if (op == 1) Huffmantree();else if (op == 2)bye();else cout << "输出有误！！！" << endl;}
}

退出函数

void bye() {::exit(0);
}

接下来就是核心部分了

欢迎界面

void welcome() {cout << "-----------------------------------------------------------------------" << endl;cout << "|                                                                      |" << endl;cout << "|                        哈 夫 曼 树 应 用                               |" << endl;cout << "|                                                                      |" << endl;cout << "-----------------------------------------------------------------------" << endl;cout << endl;
};

初始化

void init(int flag){tree->count = 0;total = 0;W=0;if (flag)generateWeight(tree, flag);memset(status, 0, sizeof status);memset(HuffmanCodes, -1, sizeof HuffmanCodes);}

哈夫曼树主函数


void Huffmantree() {//初始化init(0);//欢迎界面welcome();//生成权重generateWeight(tree, 0);//打印权重printWeight();sleep(1);//生成哈夫曼树generate(tree);//哈夫曼树写入文件writeTree(tree->head);//打印哈夫曼树printTree(0, tree->head);sleep(1);//哈夫曼编码code(tree, 0);//重新获取权重generateWeight(tree, 0);//计算WPLshow();WPL(tree->head, 0);cout << " = " << W << endl;//从键盘读入字符，生成哈夫曼树//初始化init(1);//生成哈夫曼树generate(tree);//哈夫曼编码code(tree, 1);//输入文本Input();//解码decode(tree->head);sleep(1);cout<<endl;}

生成权重

因为字符可以从文件读取，也可以从键盘读取，所以提供了两种选择，flag=0是从文件读，flag=1是从键盘读

（从文件读数据）
在这里插入图片描述


void generateWeight(HuffmanTree *t, int flag) {if (!flag) {cout << "正在努力读取文件..." << endl;sleep(1);fstream in;in.open("/Users/yuwei/Desktop/c++/practice/Text.txt", ios::in);memset(weight, 0, sizeof weight);char c;while (c = in.get()) {//weight=0,说明改字符第一次出现，if (weight[c - 'a'] == 0)t->count++;weight[c - 'a']++;//字符总数total++;}in.close();} else {cout << "请输入字符" << endl;memset(weight, 0, sizeof weight);string ch;cin >> ch;for (char c: ch) {if (c) {//weight=0,说明改字符第一次出现，if (weight[c - 'a'] == 0)t->count++;weight[c - 'a']++;//字符总数total++;}}}}

打印权重

在这里插入图片描述


void printWeight() {//将权重存入文件中fstream out;out.open("/Users/yuwei/Desktop/c++/practice/Freq.txt", ios::out);cout << "-----------------------------------------------------------------------" << endl;cout << "                         权   重                                        " << endl;cout << "-----------------------------------------------------------------------" << endl;//第一行：字符for (int i = 0; i < 26; i++) {if (weight[i] != 0) {//在终端显示printf("%c\t", 'a' + i);// 写入文件out.put('a' + i);out.put('\t');}}cout << endl;out.put('\n');//第二行：权重for (int i = 0; i < 26; i++) {if (weight[i] != 0) {cout << weight[i] << "\t";//权重可能大于10，不能当作一个字符，必须转成字符串string s = to_string(weight[i]);for (char c: s) {out.put(c);}out.put('\t');}}cout << endl;out.put('\n');//第三行：比例for (int i = 0; i < 26; i++) {if (weight[i] != 0) {cout << (weight[i] * 100) / total << "%\t";string s = to_string((weight[i] * 100) / total);for (char c: s) {out.put(c);}out.put('%');out.put('\t');}}cout << endl << endl;out.close();}

生成哈夫曼树


void generate(HuffmanTree *t) {cout << "努力构建哈夫曼树ing...";cout << endl;//间隔1ssleep(1);cout << "-----------------------------------------------------------------------" << endl;cout << "                         哈 夫 曼 树                                     " << endl;cout << "-----------------------------------------------------------------------" << endl;for (int i = 0; i < 26; i++) {//生成叶子结点CH[i] = new HuffmanNode;CH[i]->weight = 'a' + i;CH[i]->flag = false;CH[i]->lchild = CH[i]->rchild = nullptr;//如果weight为0说明改字符未出过，所以赋值为0x3ffff，作为标记if (!weight[i])weight[i] = 0x3ffff;}//f：未选结点中最小的权值最小的结点id，s：未选结点中最小的权值第二小的结点idint f, s;//进行t-》count-1次就能构造一颗哈夫曼树，比如只有两个字符，只须一步就能构造哈夫曼树for (int i = 1; i < t->count; i++) {//find ：查找未选结点中最小的权值最小的结点idf = find();//加入哈夫曼树，更新statusstatus[f] = 1;s = find();//用第weight[s]来储存新生成的结点weight[s] = weight[f] + weight[s];HuffmanNode *tem = new HuffmanNode;//更新根结点t->head = tem;//更新左右孩子tem->lchild = CH[f];tem->rchild = CH[s];//更新双亲CH[f]->parent = CH[s]->parent = tem;tem->weight = weight[s];//非叶子结点tem->flag = true;//将新结点加入CH中CH[s] = tem;}}

find()

查找未选结点中最小的权值最小的结点id


int find() {int min = -1;//找到第一个未加入哈夫曼树结点的idwhile (status[++min]);for (int i = 0; i < 26; i++) {if (!status[i]) {if (weight[i] < weight[min])min = i;}}return min;
}

哈夫曼树写入文件

n代表null
请添加图片描述
如果是叶子结点，则会在后面加上对应的字符

void writeTree(HuffmanNode *n) {if (n == nullptr) return;fstream out;out.open("/Users/yuwei/Desktop/c++/practice/HuffTree.txt", ios::app);out.write("parent: ", 8);//权重可能大于10，不能当作一个字符，必须转成字符串if (n->parent) {string s = to_string(n->parent->weight);for (char c: s) {out.put(c);}out.put('\t');} else {out.write("n", 1);out.put('\t');}out.write("weight: ", 8);//非叶子结点if (n->flag) {string s = to_string(n->weight);for (char c: s) {out.put(c);}out.put('\t');} else {string s = to_string(weight[n->weight - 'a']);for (char c: s) {out.put(c);}out.put('\t');}//左右孩子out.write("lchild: ", 8);//非叶子结点if (n->lchild) {//左孩子非叶子结点if (n->lchild->flag) {string s = to_string(n->lchild->weight);for (char c: s) {out.put(c);}out.put('\t');} else {string s = to_string(weight[n->lchild->weight - 'a']);for (char c: s) {out.put(c);}out.put('\t');}} else {out.write("n", 1);out.put('\t');}//右孩子out.write("rchild: ", 4);//非叶子结点if (n->rchild) {//左孩子非叶子结点if (n->rchild->flag) {string s = to_string(n->rchild->weight);for (char c: s) {out.put(c);}out.put('\t');} else {string s = to_string(weight[n->rchild->weight - 'a']);for (char c: s) {out.put(c);}out.put('\t');}} else {out.write("n", 1);out.put('\t');}if (!n->flag) {//如果是叶子结点out.write("char: ", 6);out.put(n->weight);}out.put('\n');out.close();writeTree(n->lchild);writeTree(n->rchild);}

打印哈夫曼树

采用以树的凹入表示法在屏幕上显示哈夫曼树
请添加图片描述


void printTree(int num, HuffmanNode *head) {if (head == nullptr)return;//按照中序顺序便利printTree(num + 1, head->lchild);//树的凹入表示法在屏幕上显示 哈夫曼树for (int i = 0; i < 15 - 3 * num; i++)cout << "  ";if (head->flag)cout << head->weight;else printf("%c", head->weight);for (int i = 0; i <= 3 * num; i++) {cout << "--";}cout << endl;printTree(num + 1, head->rchild);}

哈夫曼编码

请添加图片描述


void code(HuffmanTree *t, int flag) {cout << "哈夫曼树编码中ing...";cout << endl;sleep(1);if (!flag)//将结果写进文件write(0, 0, t->head);elseprint(0, 0, t->head);cout << "-----------------------------------------------------------------------" << endl;cout << "                         编 码 完 成                                    " << endl;cout << "-----------------------------------------------------------------------" << endl;
}void write(int i, int v, HuffmanNode *t) {if (t == nullptr)return;HuffmanCode[i] = v;write(i + 1, 0, t->lchild);//如果是叶子结点则写入文件中if (!t->flag) {fstream out;out.open("/Users/yuwei/Desktop/c++/practice/HuffCode.txt", ios::app);out.put(t->weight);out.put(':');for (int j = 1; j <= i; j++)//数字转字符out.put(HuffmanCode[j] + '0');out.put('\n');out.close();}write(i + 1, 1, t->rchild);
}

计算WPL

void WPL(HuffmanNode *n, int i) {if (n == nullptr)return;WPL(n->lchild, i + 1);if (!n->flag) {W += i * weight[n->weight - 'a'];cout << i << " * " << weight[n->weight - 'a'] << " + ";}WPL(n->rchild, i + 1);}

从键盘读入字符构造哈夫曼编码

在这里插入图片描述

//哈夫曼编码code(tree, 1);

输入文本进行编码

在这里插入图片描述


void Input() {cout << "请输入文本" << endl;string ch;cin >> ch;fstream out;out.open("/Users/yuwei/Desktop/c++/practice/HuffEncoding.txt", ios::out);for (char c: ch) {if (c) {//不等于-1说明该字符的编码存在if (HuffmanCodes[c - 'a'][0] != -1) {for (int j = 0; HuffmanCodes[c - 'a'][j] != -1; j++) {out.put(HuffmanCodes[c - 'a'][j] + '0');cout << HuffmanCodes[c - 'a'][j];}} else {cout << c;out.put(c);}}}out.close();cout << "编码完成！！！";cout << endl;sleep(1);}

解码

在这里插入图片描述


void decode(HuffmanNode *head) {cout << "努力解码中ing" << endl;sleep(1);fstream in;in.open("/Users/yuwei/Desktop/c++/practice/HuffEncoding.txt", ios::in);char c;HuffmanNode *tem = new HuffmanNode ;tem = head;c=in.get();while ((c>'a'&&c<'z')||c=='0'||c=='1'){if (c == '0') {if(tem){tem = tem->lchild;findChar(&tem);}} else if (c == '1') {if(tem){tem = tem->rchild;findChar(&tem);}} else cout << c;c=in.get();}
in.close();}void findChar(HuffmanNode **n) {if ((*n)->flag)return;//叶子结点直接输出结果else {printf("%c", (*n)->weight);//找到字符后，再从头开始(*n) = tree->head;}
}

完整代码

#include <iostream>
#include <unistd.h>
#include <cstdio>
#include <fstream>
#include <string>using namespace std;typedef struct node {//权重int weight;//左右孩子,双亲node *lchild, *rchild, *parent;//叶子结点标志 false 叶子结点 true 非叶子结点bool flag;
} HuffmanNode;typedef struct tree {//根结点HuffmanNode *head;//叶子结点个数int count;
} HuffmanTree;//叶子结点数组
HuffmanNode *CH[26];//哈夫曼编码结果
int HuffmanCode[26];//WPL
int W;//每个字符的权重
int weight[26];//权重总和
int total;//标记元素是否已经在哈夫曼树上
int status[26];//每个字符的哈夫曼编码
int HuffmanCodes[26][26];//
HuffmanTree *tree = new HuffmanTree;// 欢迎界面
void welcome();//生成权重，flag:0:从文件读取字符，1：从键盘读入
void generateWeight(HuffmanTree *t, int flag);//打印哈夫曼树, num是层数
void printTree(int num, HuffmanNode *head);//将哈夫曼树写入文件
void writeTree(HuffmanNode *n);//计算WPL显示界面
void show();void WPL(node *head, int i);//哈夫曼树核心函数
void Huffmantree();void bye();//flag:0 编码结果写入文件，flag：1编码结果存入数组
void code(HuffmanTree *t, int flag);//打印权重
void printWeight();//查找未选结点中最小的权值最小的结点id
int find();//将编码结果写入文件 ， num ：层数 v：编码值
void write(int num, int v, HuffmanNode *n);//将编码结果写入二维数组 ， num ：层数 v：编码值
void print(int i, int v, HuffmanNode *t);//从键盘输入内容，并将结果存入文件中
void Input();//生成哈夫曼树
void generate(HuffmanTree *t);//解码
void decode(HuffmanNode *head);//根据哈夫曼编码找字符
void findChar(HuffmanNode **n);
//初始化
void init(int flag);
void menu() {cout << "-----------------------------------------------------------------------" << endl;cout << "|                                                                      |" << endl;cout << "|                            欢 迎 回 来                                 |" << endl;cout << "|                                                                      |" << endl;cout << "-----------------------------------------------------------------------" << endl;cout << endl;while (true) {int op;cout << "* 1.哈夫曼树的应用" << endl << "* 2.退出" << endl;cin >> op;if (op == 1) Huffmantree();else if (op == 2)bye();else cout << "输出有误！！！" << endl;}
}void welcome() {cout << "-----------------------------------------------------------------------" << endl;cout << "|                                                                      |" << endl;cout << "|                        哈 夫 曼 树 应 用                               |" << endl;cout << "|                                                                      |" << endl;cout << "-----------------------------------------------------------------------" << endl;cout << endl;
};
void init(int flag){tree->count = 0;total = 0;W=0;if (flag)generateWeight(tree, flag);memset(status, 0, sizeof status);memset(HuffmanCodes, -1, sizeof HuffmanCodes);}void Huffmantree() {//初始化init(0);//欢迎界面welcome();//生成权重generateWeight(tree, 0);//打印权重printWeight();sleep(1);//生成哈夫曼树generate(tree);//哈夫曼树写入文件writeTree(tree->head);//打印哈夫曼树printTree(0, tree->head);sleep(1);//哈夫曼编码code(tree, 0);//重新获取权重generateWeight(tree, 0);//计算WPLshow();WPL(tree->head, 0);cout << " = " << W << endl;//从键盘读入字符，生成哈夫曼树//初始化init(1);//生成哈夫曼树generate(tree);//哈夫曼编码code(tree, 1);//输入文本Input();//解码decode(tree->head);sleep(1);cout<<endl;}void bye() {::exit(0);
}void printWeight() {//将权重存入文件中fstream out;out.open("/Users/yuwei/Desktop/c++/practice/Freq.txt", ios::out);cout << "-----------------------------------------------------------------------" << endl;cout << "                         权   重                                        " << endl;cout << "-----------------------------------------------------------------------" << endl;//第一行：字符for (int i = 0; i < 26; i++) {if (weight[i] != 0) {//在终端显示printf("%c\t", 'a' + i);// 写入文件out.put('a' + i);out.put('\t');}}cout << endl;out.put('\n');//第二行：权重for (int i = 0; i < 26; i++) {if (weight[i] != 0) {cout << weight[i] << "\t";//权重可能大于10，不能当作一个字符，必须转成字符串string s = to_string(weight[i]);for (char c: s) {out.put(c);}out.put('\t');}}cout << endl;out.put('\n');//第三行：比例for (int i = 0; i < 26; i++) {if (weight[i] != 0) {cout << (weight[i] * 100) / total << "%\t";string s = to_string((weight[i] * 100) / total);for (char c: s) {out.put(c);}out.put('%');out.put('\t');}}cout << endl << endl;out.close();}void generate(HuffmanTree *t) {cout << "努力构建哈夫曼树ing...";cout << endl;//间隔1ssleep(1);cout << "-----------------------------------------------------------------------" << endl;cout << "                         哈 夫 曼 树                                     " << endl;cout << "-----------------------------------------------------------------------" << endl;for (int i = 0; i < 26; i++) {//生成叶子结点CH[i] = new HuffmanNode;CH[i]->weight = 'a' + i;CH[i]->flag = false;CH[i]->lchild = CH[i]->rchild = nullptr;//如果weight为0说明改字符未出过，所以赋值为0x3ffff，作为标记if (!weight[i])weight[i] = 0x3ffff;}//f：未选结点中最小的权值最小的结点id，s：未选结点中最小的权值第二小的结点idint f, s;//进行t-》count-1次就能构造一颗哈夫曼树，比如只有两个字符，只须一步就能构造哈夫曼树for (int i = 1; i < t->count; i++) {//find ：查找未选结点中最小的权值最小的结点idf = find();//加入哈夫曼树，更新statusstatus[f] = 1;s = find();//用第weight[s]来储存新生成的结点weight[s] = weight[f] + weight[s];HuffmanNode *tem = new HuffmanNode;//更新根结点t->head = tem;//更新左右孩子tem->lchild = CH[f];tem->rchild = CH[s];//更新双亲CH[f]->parent = CH[s]->parent = tem;tem->weight = weight[s];//非叶子结点tem->flag = true;//将新结点加入CH中CH[s] = tem;}}void printTree(int num, HuffmanNode *head) {if (head == nullptr)return;//按照中序顺序便利printTree(num + 1, head->lchild);//树的凹入表示法在屏幕上显示 哈夫曼树for (int i = 0; i < 15 - 3 * num; i++)cout << "  ";if (head->flag)cout << head->weight;else printf("%c", head->weight);for (int i = 0; i <= 3 * num; i++) {cout << "--";}cout << endl;printTree(num + 1, head->rchild);}int find() {int min = -1;//找到第一个未加入哈夫曼树结点的idwhile (status[++min]);for (int i = 0; i < 26; i++) {if (!status[i]) {if (weight[i] < weight[min])min = i;}}return min;
}void code(HuffmanTree *t, int flag) {cout << "哈夫曼树编码中ing...";cout << endl;sleep(1);if (!flag)//将结果写进文件write(0, 0, t->head);elseprint(0, 0, t->head);cout << "-----------------------------------------------------------------------" << endl;cout << "                         编 码 完 成                                    " << endl;cout << "-----------------------------------------------------------------------" << endl;
}void write(int i, int v, HuffmanNode *t) {if (t == nullptr)return;HuffmanCode[i] = v;write(i + 1, 0, t->lchild);//如果是叶子结点则写入文件中if (!t->flag) {fstream out;out.open("/Users/yuwei/Desktop/c++/practice/HuffCode.txt", ios::app);out.put(t->weight);out.put(':');for (int j = 1; j <= i; j++)//数字转字符out.put(HuffmanCode[j] + '0');out.put('\n');out.close();}write(i + 1, 1, t->rchild);
}void writeTree(HuffmanNode *n) {if (n == nullptr) return;fstream out;out.open("/Users/yuwei/Desktop/c++/practice/HuffTree.txt", ios::app);out.write("parent: ", 8);//权重可能大于10，不能当作一个字符，必须转成字符串if (n->parent) {string s = to_string(n->parent->weight);for (char c: s) {out.put(c);}out.put('\t');} else {out.write("n", 1);out.put('\t');}out.write("weight: ", 8);//非叶子结点if (n->flag) {string s = to_string(n->weight);for (char c: s) {out.put(c);}out.put('\t');} else {string s = to_string(weight[n->weight - 'a']);for (char c: s) {out.put(c);}out.put('\t');}//左右孩子out.write("lchild: ", 8);//非叶子结点if (n->lchild) {//左孩子非叶子结点if (n->lchild->flag) {string s = to_string(n->lchild->weight);for (char c: s) {out.put(c);}out.put('\t');} else {string s = to_string(weight[n->lchild->weight - 'a']);for (char c: s) {out.put(c);}out.put('\t');}} else {out.write("n", 1);out.put('\t');}//右孩子out.write("rchild: ", 4);//非叶子结点if (n->rchild) {//左孩子非叶子结点if (n->rchild->flag) {string s = to_string(n->rchild->weight);for (char c: s) {out.put(c);}out.put('\t');} else {string s = to_string(weight[n->rchild->weight - 'a']);for (char c: s) {out.put(c);}out.put('\t');}} else {out.write("n", 1);out.put('\t');}if (!n->flag) {//如果是叶子结点out.write("char: ", 6);out.put(n->weight);}out.put('\n');out.close();writeTree(n->lchild);writeTree(n->rchild);}//
void print(int i, int v, HuffmanNode *t) {if (t == nullptr)return;HuffmanCode[i] = v;print(i + 1, 0, t->lchild);//如果是叶子结点则写入文件中if (!t->flag) {for (int j = 1; j <= i; j++) {//数字转字符HuffmanCodes[t->weight - 'a'][j - 1] = HuffmanCode[j];}}print(i + 1, 1, t->rchild);}void Input() {cout << "请输入文本" << endl;string ch;cin >> ch;fstream out;out.open("/Users/yuwei/Desktop/c++/practice/HuffEncoding.txt", ios::out);for (char c: ch) {if (c) {//不等于-1说明该字符的编码存在1if (HuffmanCodes[c - 'a'][0] != -1) {for (int j = 0; HuffmanCodes[c - 'a'][j] != -1; j++) {out.put(HuffmanCodes[c - 'a'][j] + '0');cout << HuffmanCodes[c - 'a'][j];}} else {cout << c;out.put(c);}}}out.close();cout << "编码完成！！！";cout << endl;sleep(1);}void WPL(HuffmanNode *n, int i) {if (n == nullptr)return;WPL(n->lchild, i + 1);if (!n->flag) {W += i * weight[n->weight - 'a'];cout << i << " * " << weight[n->weight - 'a'] << " + ";}WPL(n->rchild, i + 1);}void show() {cout << "努力计算WPLing...";cout << endl;sleep(1);cout << "-----------------------------------------------------------------------" << endl;cout << "                           W  P  L                                     " << endl;cout << "-----------------------------------------------------------------------" << endl;cout << "WPL: ";
}void generateWeight(HuffmanTree *t, int flag) {if (!flag) {cout << "正在努力读取文件..." << endl;sleep(1);fstream in;in.open("/Users/yuwei/Desktop/c++/practice/Text.txt", ios::in);memset(weight, 0, sizeof weight);char c;while (c = in.get()) {//weight=0,说明改字符第一次出现，if (weight[c - 'a'] == 0)t->count++;weight[c - 'a']++;//字符总数total++;}in.close();} else {cout << "请输入字符" << endl;memset(weight, 0, sizeof weight);string ch;cin >> ch;for (char c: ch) {if (c) {//weight=0,说明改字符第一次出现，if (weight[c - 'a'] == 0)t->count++;weight[c - 'a']++;//字符总数total++;}}}}void decode(HuffmanNode *head) {cout << "努力解码中ing" << endl;sleep(1);fstream in;in.open("/Users/yuwei/Desktop/c++/practice/HuffEncoding.txt", ios::in);char c;HuffmanNode *tem = new HuffmanNode ;tem = head;c=in.get();while ((c>'a'&&c<'z')||c=='0'||c=='1'){if (c == '0') {if(tem){tem = tem->lchild;findChar(&tem);}} else if (c == '1') {if(tem){tem = tem->rchild;findChar(&tem);}} else cout << c;c=in.get();}
in.close();}void findChar(HuffmanNode **n) {if ((*n)->flag)return;//叶子结点直接输出结果else {printf("%c", (*n)->weight);//找到字符后，再从头开始(*n) = tree->head;}
}int main() {menu();
}