C语言双链表问题
请帮我看看下面这段代码，哪里有问题，谢谢。编译不过去。
#include <stdio.h>#include <stdlib.h>#include <string.h>#define LEN sizeof(struct DoubleLinkList)typedef struct DoubleLinkList{ struct DoubleLinkList *previous; char *name; int *english_grade; int *math_grade; struct DoubleLinkList *next;}DB,*PDB;void printInfo();void CreatDoubleLinkList(char *name,int english_grade,int math_grade);void CreatNewDot(PDB *newDot,char *name,int english_grade,int math_grade);PDB SearchDot(char *name);void InsertDot(PDB dot,char *name);void DeleteDot(char *name);void ChangeDot(char *originName,char *changeName);void DeleteAll();PDB Head=NULL;PDB newDot=NULL;char *name;int *english_grade;int *math_grade;char *chanName,*inputName;int order=-1;int main(){ do { printf("***********************命令菜单***************************\n"); printf("*** ***\n"); printf("***********************1:创建双向链表头节点***************\n"); printf("*** ***\n"); printf("***********************2:创建新节点***********************\n"); printf("*** ***\n"); printf("***********************3:改变节点值***********************\n"); printf("*** ***\n"); printf("***********************4:删除节点*************************\n"); printf("*** ***\n"); printf("***********************5:打印现在列表的值*****************\n"); printf("*** ***\n"); printf("***********************6:释放链表所有节点*****************\n"); printf("*** ***\n"); printf("***********************7:退出程序*************************\n"); printf("请输入命令：\n"); scanf("%d",&order); switch(order) { case 1: printf("请输入头结点的值(姓名，英语成绩，数学成绩)：\n"); scanf("%s%d%d",name,&english_grade,&math_grade); CreatDoubleLinkList(name,english_grade,math_grade); break; case 2: printf("请输入头结点的值(姓名，英语成绩，数学成绩)：\n"); scanf("%s%d%d",name,&english_grade,&math_grade); CreatNewDot(&newDot,name,english_grade,math_grade); printf("请输入你要插在那个节点之后(姓名)：\n"); scanf("%s",inputName); InsertDot(newDot,inputName); break; case 3: printf("请输入要改变的节点的原来的值(姓名)：\n"); scanf("%s",name); printf("请输入要改变后值：\n"); scanf("%s",chanName); ChangeDot(name,chanName); break; case 4: printf("输入要删除的节点的值：\n"); scanf("%s",name); DeleteDot(name); break; case 5: printInfo(); break; case 6: DeleteAll(); break; default: break; } }while(order!=7); return 0;}void printInfo(){ if(Head==NULL) { printf("链表为空！\n"); return ; } PDB pOut; pOut = Head; printf("链表值为：\n"); do{ printf("%s %d %d\n",pOut->name,pOut->english_grade,pOut->math_grade); pOut=pOut->next; }while(pOut->next!=Head->next);}void CreatDoubleLinkList(char *name,int english_grade,int math_grade){ Head=(PDB)malloc(LEN);//必须申请内存空间，不然报错，如果没有初始化为NULL，又没有分配空间，后果和严重，令CodeBlocks休克了 Head->name=name; Head->english_grade=english_grade; Head->math_grade=math_grade; Head->next=Head->previous=Head; printf("双向链表的头结点已经创建，值为：%d\n",Head->name);}void CreatNewDot(PDB *newDot,char *name,int english_grade,int math_grade){ //指针作为参数，为指针参数申请内存空间， //必须使用双指针，实参为指针的引用， //否则参数指针不会被分配空间，并且引起内存泄露，无法free掉 (*newDot)=(PDB)malloc(LEN); (*newDot)->name=name; (*newDot)->english_grade=english_grade; (*newDot)->math_grade=math_grade;}PDB SearchDot(char *name){ if(Head==NULL) { printf("链表为空，没有可以删除的节点！\n"); return NULL; } else if(strcmp(Head->name,name)) { return Head; } else { PDB search=Head->next; while((strcmp(Head->name,name))!=0&&search!=Head) { search=search->next; } if(search==Head) return NULL; else return search; } return NULL;}void InsertDot(PDB dot,char *name){ if(dot==NULL) return ; else { PDB AfterDot=SearchDot(name); dot->previous=AfterDot; dot->next=AfterDot->next; AfterDot->next->previous=dot; AfterDot->next=dot; } printf("数据插入成功!\n");}void DeleteDot(char *name){ PDB delDot=SearchDot(name); if(delDot==NULL) { printf("节点不存！\n"); return ; } delDot->previous->next=delDot->next; delDot->next->previous=delDot->previous; free(delDot); printf("节点删除成功！\n");}void ChangeDot(char *originName,char *changeName){ PDB chanDot=SearchDot(originName); if(chanDot==NULL) { printf("不存在节点值为：%s 的节点！\n",originName); return ; } else { chanDot->name=changeName; printf("节点值更改成功!\n"); }}void DeleteAll(){ PDB del=NULL; if(Head==NULL) { printf("链表为空，不需要释放！\n"); return ; } while(Head->next!=Head) { del=Head->next; Head->next=del->next; del->next->previous=Head; free(del); } if(Head!=NULL) free(Head); Head=NULL; printf("链表释放完毕！");}
void printInfo(){ PDB pOut; // 变量定义要放在函数开头 if(Head==NULL) { printf("链表为空！\n"); return ; } pOut = Head; printf("链表值为：\n"); do{ printf("%s %d %d\n",pOut->name,pOut->english_grade,pOut->math_grade); pOut=pOut->next; }while(pOut->next!=Head->next);}
[解决办法]
错误有些多啊
#include <stdio.h>#include <stdlib.h>#include <string.h>#define LEN sizeof(struct DoubleLinkList)typedef struct DoubleLinkList{ struct DoubleLinkList *previous; char name[100]; int english_grade; int math_grade; struct DoubleLinkList *next;}DB,*PDB;void printInfo();void CreatDoubleLinkList(char *name,int english_grade,int math_grade);void CreatNewDot(PDB *newDot,char *name,int english_grade,int math_grade);PDB SearchDot(char *name);void InsertDot(PDB dot,char *name);void DeleteDot(char *name);void ChangeDot(char *originName,char *changeName);void DeleteAll();PDB Head=NULL;PDB newDot=NULL;char name[100];int english_grade;int math_grade;char chanName[100],inputName[100];int order=-1;int main(){ do { printf("***********************命令菜单***************************\n"); printf("*** ***\n"); printf("***********************1:创建双向链表头节点***************\n"); printf("*** ***\n"); printf("***********************2:创建新节点***********************\n"); printf("*** ***\n"); printf("***********************3:改变节点值***********************\n"); printf("*** ***\n"); printf("***********************4:删除节点*************************\n"); printf("*** ***\n"); printf("***********************5:打印现在列表的值*****************\n"); printf("*** ***\n"); printf("***********************6:释放链表所有节点*****************\n"); printf("*** ***\n"); printf("***********************7:退出程序*************************\n"); printf("请输入命令：\n"); scanf("%d",&order); memset(name,0,sizeof(name)); switch(order) { case 1: printf("请输入头结点的值(姓名，英语成绩，数学成绩)：\n"); scanf("%s%d%d",name,&english_grade,&math_grade); CreatDoubleLinkList(name,english_grade,math_grade); break; case 2: printf("请输入头结点的值(姓名，英语成绩，数学成绩)：\n"); scanf("%s%d%d",name,&english_grade,&math_grade); CreatNewDot(&newDot,name,english_grade,math_grade); printf("请输入你要插在那个节点之后(姓名)：\n"); scanf("%s",inputName); InsertDot(newDot,inputName); break; case 3: printf("请输入要改变的节点的原来的值(姓名)：\n"); scanf("%s",name); printf("请输入要改变后值：\n"); scanf("%s",chanName); ChangeDot(name,chanName); break; case 4: printf("输入要删除的节点的值：\n"); scanf("%s",name); DeleteDot(name); break; case 5: printInfo(); break; case 6: DeleteAll(); break; default: break; } }while(order!=7); return 0;}void printInfo(){ if(Head==NULL) { printf("链表为空！\n"); return ; } PDB pOut; pOut = Head; printf("链表值为：\n"); do{ printf("%s %d %d\n",pOut->name,pOut->english_grade,pOut->math_grade); pOut=pOut->next; }while(pOut->next!=Head->next);}void CreatDoubleLinkList(char *name,int english_grade,int math_grade){ Head=(PDB)malloc(LEN);//必须申请内存空间，不然报错，如果没有初始化为NULL，又没有分配空间，后果和严重，令CodeBlocks休克了 memcpy(Head->name,name,sizeof(Head->name)); Head->english_grade=english_grade; Head->math_grade=math_grade; Head->next=Head->previous=Head; printf("双向链表的头结点已经创建，值为：%s\n",Head->name);}void CreatNewDot(PDB *newDot,char *name,int english_grade,int math_grade){ //指针作为参数，为指针参数申请内存空间， //必须使用双指针，实参为指针的引用， //否则参数指针不会被分配空间，并且引起内存泄露，无法free掉 (*newDot)=(PDB)malloc(LEN); memcpy(Head->name,name,sizeof(Head->name)); (*newDot)->english_grade=english_grade; (*newDot)->math_grade=math_grade;}PDB SearchDot(char *name){ if(Head==NULL) { printf("链表为空，没有可以删除的节点！\n"); return NULL; } else if(strcmp(Head->name,name)==0) { return Head; } else { PDB search=Head->next; while((strcmp(Head->name,name))!=0&&search!=Head) { search=search->next; } if(search==Head) return NULL; else return search; } return NULL;}void InsertDot(PDB dot,char *name){ if(dot==NULL) return ; else { PDB AfterDot=SearchDot(name); dot->previous=AfterDot; dot->next=AfterDot->next; AfterDot->next->previous=dot; AfterDot->next=dot; } printf("数据插入成功!\n");}void DeleteDot(char *name){ PDB delDot=SearchDot(name); if(delDot==NULL) { printf("节点不存！\n"); return ; } delDot->previous->next=delDot->next; delDot->next->previous=delDot->previous; free(delDot); printf("节点删除成功！\n");}void ChangeDot(char *originName,char *changeName){ PDB chanDot=SearchDot(originName); if(chanDot==NULL) { printf("不存在节点值为：%s 的节点！\n",originName); return ; } else { memcpy(Head->name,name,sizeof(Head->name)); printf("节点值更改成功!\n"); }}void DeleteAll(){ PDB del=NULL; if(Head==NULL) { printf("链表为空，不需要释放！\n"); return ; } while(Head->next!=Head) { del=Head->next; Head->next=del->next; del->next->previous=Head; free(del); } if(Head!=NULL) free(Head); Head=NULL; printf("链表释放完毕！");}
[解决办法]
#include <stdio.h>#include <stdlib.h>#include <string.h>#define LEN sizeof(struct DoubleLinkList)typedef struct DoubleLinkList{ struct DoubleLinkList *previous; char *name; int english_grade; int math_grade; struct DoubleLinkList *next;}DB,*PDB;void printInfo();void CreatDoubleLinkList(char *name,int english_grade,int math_grade);void CreatNewDot(PDB *newDot,char *name,int english_grade,int math_grade);PDB SearchDot(char *name);void InsertDot(PDB dot,char *name);void DeleteDot(char *name);void ChangeDot(char *originName,char *changeName);void DeleteAll();PDB Head=NULL;PDB newDot=NULL;char name[10];int english_grade=0;int math_grade=0;char *chanName,*inputName;int order=-1;int main(){ do { printf("***********************命令菜单***************************\n"); printf("*** ***\n"); printf("***********************1:创建双向链表头节点***************\n"); printf("*** ***\n"); printf("***********************2:创建新节点***********************\n"); printf("*** ***\n"); printf("***********************3:改变节点值***********************\n"); printf("*** ***\n"); printf("***********************4:删除节点*************************\n"); printf("*** ***\n"); printf("***********************5:打印现在列表的值*****************\n"); printf("*** ***\n"); printf("***********************6:释放链表所有节点*****************\n"); printf("*** ***\n"); printf("***********************7:退出程序*************************\n"); printf("请输入命令：\n"); scanf("%d",&order); switch(order) { case 1: printf("请输入头结点的值(姓名，英语成绩，数学成绩)：\n"); scanf("%s%d%d",name,&english_grade,&math_grade); CreatDoubleLinkList(name,english_grade,math_grade); break; case 2: printf("请输入头结点的值(姓名，英语成绩，数学成绩)：\n"); scanf("%s%d%d",name,&english_grade,&math_grade); CreatNewDot(&newDot,name,english_grade,math_grade); printf("请输入你要插在那个节点之后(姓名)：\n"); scanf("%s",inputName); InsertDot(newDot,inputName); break; case 3: printf("请输入要改变的节点的原来的值(姓名)：\n"); scanf("%s",name); printf("请输入要改变后值：\n"); scanf("%s",chanName); ChangeDot(name,chanName); break; case 4: printf("输入要删除的节点的值：\n"); scanf("%s",name); DeleteDot(name); break; case 5: printInfo(); break; case 6: DeleteAll(); break; default: break; } }while(order!=7); return 0;}void printInfo(){ if(Head==NULL) { printf("链表为空！\n"); return ; } PDB pOut; pOut = Head; printf("链表值为：\n"); do{ printf("%s %d %d\n",pOut->name,pOut->english_grade,pOut->math_grade); pOut=pOut->next; }while(pOut->next!=Head->next);}void CreatDoubleLinkList(char *name,int english_grade,int math_grade){ Head=(PDB)malloc(LEN);//必须申请内存空间，不然报错，如果没有初始化为NULL，又没有分配空间，后果和严重，令CodeBlocks休克了 Head->name=name; Head->english_grade=english_grade; Head->math_grade=math_grade; Head->next=Head->previous=Head; printf("双向链表的头结点已经创建，值为：%d\n",Head->name);}void CreatNewDot(PDB *newDot,char *name,int english_grade,int math_grade){ //指针作为参数，为指针参数申请内存空间， //必须使用双指针，实参为指针的引用， //否则参数指针不会被分配空间，并且引起内存泄露，无法free掉 (*newDot)=(PDB)malloc(LEN); (*newDot)->name=name; (*newDot)->english_grade=english_grade; (*newDot)->math_grade=math_grade;}PDB SearchDot(char *name){ if(Head==NULL) { printf("链表为空，没有可以删除的节点！\n"); return NULL; } else if(strcmp(Head->name,name)) { return Head; } else { PDB search=Head->next; while((strcmp(Head->name,name))!=0&&search!=Head) { search=search->next; } if(search==Head) return NULL; else return search; } return NULL;}void InsertDot(PDB dot,char *name){ if(dot==NULL) return ; else { PDB AfterDot=SearchDot(name); dot->previous=AfterDot; dot->next=AfterDot->next; AfterDot->next->previous=dot; AfterDot->next=dot; } printf("数据插入成功!\n");}void DeleteDot(char *name){ PDB delDot=SearchDot(name); if(delDot==NULL) { printf("节点不存！\n"); return ; } delDot->previous->next=delDot->next; delDot->next->previous=delDot->previous; free(delDot); printf("节点删除成功！\n");}void ChangeDot(char *originName,char *changeName){ PDB chanDot=SearchDot(originName); if(chanDot==NULL) { printf("不存在节点值为：%s 的节点！\n",originName); return ; } else { chanDot->name=changeName; printf("节点值更改成功!\n"); }}void DeleteAll(){ PDB del=NULL; if(Head==NULL) { printf("链表为空，不需要释放！\n"); return ; } while(Head->next!=Head) { del=Head->next; Head->next=del->next; del->next->previous=Head; free(del); } if(Head!=NULL) free(Head); Head=NULL; printf("链表释放完毕！");}
[解决办法]
在把1楼的指出的问题加上就代码应该就没问题了
[解决办法]
你的代码编译时好多警告啊。用法别太奇怪了。
像全局变量english_grade、math_grade都被定义为指向整数的指针，而且没有将它们指向具体的整型变量，可后面使用的时候：scanf("%s%d%d",name,&english_grade,&math_grade);？？？
把整数送进指针变量里保存？那又为什么要用指针变量？
[解决办法]
仅供参考
//将c:\\tmp文件夹下的所有文件的内容全部放到用malloc分配的内存中#include <stdio.h>#include <stdlib.h>#include <string.h>#include <io.h>struct FB { char fn[256]; size_t fl; char *b; struct FB *next; struct FB *prev;} *fh,*fb,*ft;char ln[256];char fpn[256];FILE *af;FILE *f;int L,n;int main() { system("dir /b /a-d c:\\tmp\\*.* >c:\\allfn.txt"); af=fopen("c:\\allfn.txt","r"); if (NULL==af) { printf("Can not open file c:\\allfn.txt!\n"); return 1; } fh=NULL; fb=NULL; n=0; while (1) { if (NULL==fgets(ln,256,af)) break; L=strlen(ln); if ('\n'==ln[L-1]) ln[L-1]=0; printf("read %s\n",ln); strcpy(fpn,"c:\\tmp\\"); strcat(fpn,ln); ft=(struct FB *)malloc(sizeof(struct FB)); if (NULL==ft) { printf("Can not malloc ft!\n"); fclose(af); return 2;//之前的malloc在main退出后由操作系统自动free } printf("ft[%d]==%p\n",n,ft); strcpy(ft->fn,fpn); f=fopen(fpn,"rb"); if (NULL==f) { printf("Can not open file %s!\n",fpn); fclose(af); return 3;//之前的malloc在main退出后由操作系统自动free } ft->fl=_filelength(fileno(f)); ft->b=malloc(ft->fl); if (NULL==ft->b) { printf("Can not malloc ft->b!\n"); fclose(f); fclose(af); return 4;//之前的malloc在main退出后由操作系统自动free } printf("ft[%d]->b==%p\n",n,ft->b); if (ft->fl!=fread(ft->b,1,ft->fl,f)) { printf("fread error!\n"); fclose(f); fclose(af); return 5;//之前的malloc在main退出后由操作系统自动free } fclose(f); ft->next=NULL; if (NULL==fh) { ft->prev=NULL; fh=ft; } else { fb->next=ft; ft->prev=fb; } fb=ft; n++; } fclose(af); printf("-----list-----\n"); for (ft=fh;NULL!=ft;ft=ft->next) { printf("%8d %s\n",ft->fl,ft->fn); if (NULL!=ft) fb=ft; } printf("-----free-----\n"); n--; if (NULL!=fh) { for (ft=fb->prev;NULL!=ft;ft=ft->prev) { if (NULL!=ft->next->b) { printf("ft[%d]->b==%p\n",n,ft->next->b); free(ft->next->b); } if (NULL!=ft->next) { printf("ft[%d]==%p\n",n,ft->next); free(ft->next); } n--; } if (NULL!=fh->b) { printf("ft[0]->b==%p\n",fh->b); free(fh->b); } printf("ft[0]==%p\n",fh); free(fh); } return 0;}//C:\tmp\tmp\Debug>dir /a-d c:\tmp// 驱动器 C 中的卷是 C_HD5_1// 卷的序列号是 1817-D526//// c:\tmp 的目录////找不到文件////C:\tmp\tmp\Debug>tmp//找不到文件//-----list-----//-----free-----////C:\tmp\tmp\Debug>dir /a-d c:\tmp// 驱动器 C 中的卷是 C_HD5_1// 卷的序列号是 1817-D526//// c:\tmp 的目录////2011-06-30 18:04 44,840 my_c.rar//2011-06-30 17:18 1,036 err.frm//2011-06-30 14:32 14,243 出租.txt//2011-06-28 12:08 23,681 MSDN98书签.txt// 4 个文件 83,800 字节// 0 个目录 17,041,870,848 可用字节////C:\tmp\tmp\Debug>tmp//read my_c.rar//ft[0]==00421800//ft[0]->b==00520068//read err.frm//ft[1]==00421670//ft[1]->b==0052AFC0//read 出租.txt//ft[2]==00421530//ft[2]->b==00378F28//read MSDN98书签.txt//ft[3]==004213F0//ft[3]->b==0052B3F8//-----list-----// 44840 c:\tmp\my_c.rar// 1036 c:\tmp\err.frm// 14243 c:\tmp\出租.txt// 23681 c:\tmp\MSDN98书签.txt//-----free-----//ft[3]->b==0052B3F8//ft[3]==004213F0//ft[2]->b==00378F28//ft[2]==00421530//ft[1]->b==0052AFC0//ft[1]==00421670//ft[0]->b==00520068//ft[0]==00421800////C:\tmp\tmp\Debug>