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# 哪里有较复杂,较大的源代码例子?

borlandsoftware 2002-01-08 02:25:26
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andy_lau 2002-01-09

2）通过哈夫曼算法求出文件中字符的相应编码
3）建立一与正文文件(test.txt)对应的编码文件（本程序中为bainma.txt）
//////////////////////////////////////////////////////////////////////////////////
#include<stdio.h>
#include<alloc.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>

/*声明两种链表结构----start*/
struct node_a{ /*链表1-----作用：用来统计文件中字符的个数和种类（通过count）*/
char data;
int count;
struct node_a *next;
};
typedef struct node_a node,*list;

struct nodeb{ /*链表2-----作用：用来建立用相应的编码代替字符的新文件*/
char data;
struct nodeb *next;
};
typedef struct nodeb node_b,*list_b; /*jiang bianma xieru wenjian*/
/*声明两种链表结构----end*/

/*哈夫曼算法种相关的3种结构的声明-----start*/
struct forest{
float weight;
int root;
};
struct alphabet{
char symbol;
float probability;
int leaf;
char *bianma;
};
struct tree{
int lchild;
int rchild;
int parent;
};
typedef struct tree *tree_ptr,tree_node;
typedef struct forest *forest_ptr,forest_node;
typedef struct alphabet *alphabet_ptr,alphabet_node;
tree_ptr tree1;
forest_ptr forest1;
alphabet_ptr alphabet1;
int lasttree,lastnode;
int least,second;
/*哈夫曼算法种相关的3种结构的声明-----end*/

/**************stack difination start****************/
struct stacknode{
char *bian_ma;
struct stacknode *next;
};
typedef struct stacknode stack_node;

void push(char *item){
if(top!=NULL){
if(p==NULL){
printf("Memory allocation error!");
return;
}
p->bian_ma=item;
p->next=top;
top=p;
}
else{
if(!top){
printf("Memory allocation error!");
return;
}
top->bian_ma=item;
top->next=NULL;
}
}

void pop(void){
p=top;
top=top->next;
free(p);
}

void makenull(void){
while(top!=NULL)
pop();
}

int empty(){
if(top==NULL)
return 1;
else
return 0;
}

char* tops(void){
return (top->bian_ma);
}

ptr=s;
while(ptr!=NULL){
printf("%s",ptr->bian_ma);
ptr=ptr->next;
}
}

/***************************stack__difination is end************************/
void display(list h){ /*显示链表1*/
list ptr;
int i=1;
ptr=h->next;
while(ptr!=NULL){
printf("%d,%c,%d\n",i,ptr->data,ptr->count);
i++;
ptr=ptr->next;
}
}
void display_b(list_b h){ /*显示链表2*/
list_b ptr;
int i=1;
ptr=h->next;
while(ptr!=NULL){
printf("%d,%c\n",i,ptr->data);
i++;
ptr=ptr->next;
}
}

void insert(char item){ /*用于插入元素以建立链表1*/
list temp,ptr;
int flag;
if(ptr==NULL){
}
else{
while(ptr!=NULL){
if(ptr->data==item){
ptr->count=ptr->count+1;
flag=1;
}
ptr=ptr->next;
}
if(flag==1)
return;
else{
temp=ptr->next;
ptr->next=(list)malloc(sizeof(node));
ptr->next->data=item;
ptr->next->count=1;
ptr->next->next=temp;
}
}
}

void insert_b(char item){ /*插入元素以建立链表2*/
list_b ptr_b,temp_b;
if(ptr_b->next==NULL){
}
else{
while(ptr_b->next!=NULL){
ptr_b=ptr_b->next;
}
ptr_b->next=(list_b)malloc(sizeof(node_b));
ptr_b->next->data=item;
ptr_b->next->next=NULL;
}
}

void search(void){ /*搜索文件并将文件中的数据分别存入作用不同的链表中*/
FILE *fp;
list ptr;
char ch;
if((fp=fopen("test.txt","r"))==NULL)
while(!feof(fp)){
ch=getc(fp);
if(ferror(fp)){
printf("error!\n");
break;
}
if(ch==EOF)
break;
insert(ch); /*插入元素进链表1*/
insert_b(ch); /*插入元素进链表2*/
}
printf("\n");
fclose(fp);
}

void display_struct(int n){ /*显示哈夫曼算法中的3个结构树组 */
int i=0;
printf("\n\n=======================================\n\n");
printf("FOREST_STRUCT_ARRY :\n\n\n");
for(i=0;i<=n;i++){
printf("%f,%d\n",forest1[i].weight,forest1[i].root);
}
getch();
printf("\n\nALPHABET_STRUCT_ARRY :\n\n\n");
for(i=0;i<=n;i++){
printf("%f,%d,%c\n",alphabet1[i].probability,alphabet1[i].leaf,alphabet1[i].symbol);
}
getch();
printf("\n\nTREE_STRUCT_ARRY :\n\n\n");
for(i=0;i<=2*n-1;i++)
printf("%d,%d,%d\n",tree1[i].lchild,tree1[i].rchild,tree1[i].parent);
printf("\n\n======================================\n\n");
getch();
}

int init_struct(void){ /*初始化哈夫曼算法中3种结构数组*/
list ptr;
float count=.0;
int i=1,n=0;
while(ptr!=NULL){
count=ptr->count+count;
n++;
ptr=ptr->next;
}
forest1=(forest_ptr)malloc(sizeof(forest_node)*n+sizeof(forest_node));
alphabet1=(alphabet_ptr)malloc(sizeof(alphabet_node)*n+sizeof(alphabet_node));
tree1=(tree_ptr)malloc(sizeof(tree_node)*n*2-sizeof(tree_node));
forest1[0].weight=alphabet1[0].probability=0.0;
forest1[0].root=alphabet1[0].leaf=0;
alphabet1[0].symbol='0';
while(ptr!=NULL){
forest1[i].weight=alphabet1[i].probability=ptr->count/count;
forest1[i].root=alphabet1[i].leaf=i;
alphabet1[i].symbol=ptr->data;
i++;
ptr=ptr->next;
}
for(i=0;i<=2*n-1;i++){
tree1[i].lchild=0;
tree1[i].rchild=0;
tree1[i].parent=0;
}
return n;
}

void creat(void){ /*创建正文文件test.txt*/
FILE *fp,*out;
char ch;
if((fp=fopen("test.txt","w+t"))==NULL)
printf("Creat error!\n");
printf("Input the data:\n");
ch=getch();
putch(ch);
while(ch!='#'){
putc(ch,fp);
ch=getch();
putch(ch);
}
fclose(fp);
}

void creat_bianma(int number){ /*根据哈夫曼算法建立文件中各种字符对应的编码*/
int i,j,n;
int p;
char *bm=malloc(sizeof(char)*number);
for(n=1;n<=number;n++){
j=i=n;
makenull();
p=tree1[i].parent;
while(tree1[p].parent!=0){
if(tree1[p].lchild==i)
push("0");
else
push("1");
i=p;
p=tree1[p].parent;
}

if(tree1[p].lchild==i)
push("0");
else
push("1");
strcpy(bm," "); /*目的：使创建编码文件中的各编码中间存在间隔*/
while(!empty()){
strcat(bm,tops());
pop();
}
alphabet1[j].bianma=malloc(sizeof(char)*number);
strcpy(alphabet1[j].bianma,bm);
printf("\n%c:%s",alphabet1[j].symbol,alphabet1[j].bianma); /*打印出相应的编码*/
getch();
}
}

void write_new_file(int number){ /*根据相应的编码重新建立编码文件*/
FILE *fp;
list_b ptr;
int i;
char *ch=malloc(sizeof(char)*number);
if((fp=fopen("bianma.txt","w"))==NULL)
printf("Write in a new file error!");
else{
while(ptr!=NULL){
for(i=1;i<=number;i++){
if(ptr->data==alphabet1[i].symbol){
strcpy(ch,alphabet1[i].bianma);
fputs(ch,fp);
}
}
ptr=ptr->next;
}
}
fclose(fp);
}

void main(void){
int i,num;
char ch;
void huffman(void);
void lightones();
do{
system("cls");
creat();
search();
printf("\nlianbiao1:\n");
getch();
printf("\nlianbiao2:\n");
getch();
num=init_struct();
printf("\n");
printf("The 3 init_struct of huffman?\n");
display_struct(num);/*显示初始化的哈夫曼书的相关3个结构数组*/
lastnode=num;
lasttree=num;
huffman();
printf("Now the 3 struct through huffman shuanfa\n");
display_struct(num);/*显示哈夫曼树中相关的3种结构（经过哈夫曼算法处理）*/
printf("\nThe bian_ma is:\n");
creat_bianma(num);
write_new_file(num);
printf("\nDo you want to re_try(y/n)?");
ch=getchar();
}while(ch=='y');
}

/*哈夫曼算法-----defination_start*/
void lightones(void){
int i;
if(forest1[1].weight<=forest1[2].weight){
least=1;
second=2;
}
else{
least=2;
second=1;
}
for(i=3;i<=lasttree;i++)
if(forest1[i].weight<forest1[least].weight){
second=least;
least=i;
}
else
if(forest1[i].weight<forest1[second].weight)
second=i;
}

int creat_tree(int lefttree,int righttree){
lastnode=lastnode+1;
tree1[lastnode].lchild=forest1[lefttree].root;
tree1[lastnode].rchild=forest1[righttree].root;
tree1[lastnode].parent=0;
tree1[forest1[lefttree].root].parent=lastnode;
tree1[forest1[righttree].root].parent=lastnode;
return(lastnode);
}

void huffman(void){
int i,j;
int newroot;
while(lasttree>1){
lightones();
i=least;
j=second;
newroot=creat_tree(i,j);
forest1[i].weight=forest1[i].weight+forest1[j].weight;
forest1[i].root=newroot;
forest1[j]=forest1[lasttree];
lasttree=lasttree-1;
}
}
/*哈夫曼算法-----defination end*/

scklotz 2002-01-08

gigix 2002-01-08
www.boost.org
STL

seacalf 2002-01-08
www.simtel.com

panjet 2002-01-08
linux源代码,较复杂也较大.

C语言

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2002-01-08 02:25