一个建立学生链表的程序，在程序那写一个fwrite函数，写入test.txt文件内？
stu* insert(stu*head)//插入函数上，写个例子！！！！！
#include <stdio.h>#include <stdlib.h>#include <malloc.h>typedef struct stu_x{ int student_id; char name[20]; struct stu_x* next;}stu;stu* create(){ stu* head=NULL,*tail=NULL,*new=NULL; char y; head=NULL; tail=NULL; do{ new = (stu*)malloc(sizeof(stu)); printf("input new student on the table\n"); printf("input the students' id:"); scanf("%d",&new->student_id); printf("input the students' name:"); scanf("%*c"); scanf("%s",new -> name); new -> next = NULL; if(head==NULL&&tail==NULL) { head=new; tail=new; } else { tail->next=new; tail=new; } printf("choose Y to go ahead,choose N to quit:");//..... scanf("%*c"); scanf("%c",&y); }while(y='y'); return head;}stu*del(stu*head){ stu*p=NULL; stu*cur=NULL; int n; char y; do{ if(head==NULL) { printf("Nobody here,....can't delete"); return NULL; } else { printf("Enter your deleted students'id"); scanf("%d",&n); for(cur=head;cur;cur=cur->next) { if(cur==head&&cur->student_id==n) { printf("the no.%d student has been deleted\n",n);//.... free(cur); } else if(cur->student_id==n) { p=cur; cur=cur->next; printf("the no.%d student has been deleted\n",n); free(cur); } else printf("Sorry,it don't find your want to delete student");//...... } } printf("choose Y to go ahead,choose No to quit"); scanf("%*c"); scanf("%c",&y); }while(y='y');}stu* insert(stu*head)//插入函数上，写个例子！！！！！{ stu*cur=NULL; stu* p=NULL; stu* pre=NULL; int n; char y; cur=head; do{ p = (stu*)malloc(sizeof(stu)); printf("input the no. of node you would like to insert"); scanf("%d",&p->student_id); printf("input the name of node you would like to insert:"); scanf("%*c"); scanf("%s",p->name); p->next=NULL; if(head==NULL) { cur=head=p; printf("No one before the students,this is the first student\n"); } else { printf("input the student position you would like to insert"); scanf("%d",&n); cur=head; while(cur!=NULL&&n>0) { if(cur->student_id==p->student_id) { printf("student already exist\n");//.... break; } else if(cur->student_id==n) { pre = cur -> next; pre == NULL?printf("student's in the end\n"):printf("student's in the between\n");//.... cur->next=p; p->next=pre; break; } pre=cur; cur=cur->next; } if(cur==NULL) { printf("position not found.please input students'information in the last position\n"); pre->next=p; } } printf("choose Y to go ahead, choose N to quit\n"); scanf("%*c"); scanf("%c",&y); }while(y=='y'); return head;}void print(stu* head){ stu* cur=NULL; int i=1; cur = head; if(head==NULL) { printf("Nobody here\n"); return; } do{ printf("the %d man information",i); printf("student id:%d,",cur->student_id); printf("name:%s\n",cur->name); cur = cur->next; i++; }while(cur!=NULL);}int main(){ stu*s=NULL; int n; do{ printf("please choose "); printf("1.print and 2.insert and 3.del and 4.create or 5.exit\n");//..... printf("please input your choice"); scanf("%d",&n); switch(n) { case 1:print(s);break; case 2:s=insert(s);break; case 3:s=del(s);break; case 4:s=create();break; case 5:printf("bye bye!!!\n");exit(0); } }while(1);}
#include <stdio.h>#include <stdlib.h>#include <malloc.h>typedef struct stu_x{ int student_id; char name[20]; struct stu_x* next;}stu;stu* create(){ stu* head=NULL,*tail=NULL,*new=NULL; char y; head=NULL; tail=NULL; do{ new = (stu*)malloc(sizeof(stu)); printf("input new student on the table\n"); printf("input the students' id:"); scanf("%d",&new->student_id); printf("input the students' name:"); scanf("%*c"); scanf("%s",new -> name); new -> next = NULL; if(head==NULL&&tail==NULL) { head=new; tail=new; } else { tail->next=new; tail=new; } printf("choose Y to go ahead,choose N to quit:");//..... scanf("%*c"); scanf("%c",&y); }while(y='y'); return head;}stu*del(stu*head){ stu*p=NULL; stu*cur=NULL; int n; char y; do{ if(head==NULL) { printf("Nobody here,....can't delete"); return NULL; } else { printf("Enter your deleted students'id"); scanf("%d",&n); for(cur=head;cur;cur=cur->next) { if(cur==head&&cur->student_id==n) { printf("the no.%d student has been deleted\n",n);//.... free(cur); } else if(cur->student_id==n) { p=cur; cur=cur->next; printf("the no.%d student has been deleted\n",n); free(cur); } else printf("Sorry,it don't find your want to delete student");//...... } } printf("choose Y to go ahead,choose No to quit"); scanf("%*c"); scanf("%c",&y); }while(y='y'); save(head);//删除的时候调用下保存函数就OK了 }stu* insert(stu*head)//插入函数上，写个例子！！！！！{ stu*cur=NULL; stu* p=NULL; stu* pre=NULL; int n; char y; cur=head; do{ p = (stu*)malloc(sizeof(stu)); printf("input the no. of node you would like to insert"); scanf("%d",&p->student_id); printf("input the name of node you would like to insert:"); scanf("%*c"); scanf("%s",p->name); p->next=NULL; if(head==NULL) { cur=head=p; printf("No one before the students,this is the first student\n"); } else { printf("input the student position you would like to insert"); scanf("%d",&n); cur=head; while(cur!=NULL&&n>0) { if(cur->student_id==p->student_id) { printf("student already exist\n");//.... break; } else if(cur->student_id==n) { pre = cur -> next; pre == NULL?printf("student's in the end\n"):printf("student's in the between\n");//.... cur->next=p; p->next=pre; break; } pre=cur; cur=cur->next; } if(cur==NULL) { printf("position not found.please input students'information in the last position\n"); pre->next=p; } } printf("choose Y to go ahead, choose N to quit\n"); scanf("%*c"); scanf("%c",&y); }while(y=='y'); save(head);//插入的时候调用下保存函数就OK了 return head;}void print(stu* head){ stu* cur=NULL; int i=1; cur = head; if(head==NULL) { printf("Nobody here\n"); return; } do{ printf("the %d man information",i); printf("student id:%d,",cur->student_id); printf("name:%s\n",cur->name); cur = cur->next; i++; }while(cur!=NULL);}void save(stu* head){ stu* cur=NULL; FILE *sout=fopen("test.txt","w+");//这儿加个定义 int i=1; cur = head; if(head==NULL) { printf("Nobody here\n"); return; } if (!sout) //加个判断 { printf ( "open file wrong!\n"); return; } do{ fprintf(sout, "the %d man information",i); fprintf(sout, "student id:%d,",cur->student_id); fprintf(sout, "name:%s\n",cur->name); cur = cur->next; i++; }while(cur!=NULL);}int main(){ stu*s=NULL; int n; do{ printf("please choose "); printf("0.save and 1.print and 2.insert and 3.del and 4.create or 5.exit\n");//..... printf("please input your choice"); scanf("%d",&n); switch(n) { case 0:save(s);break; case 1:print(s);break; case 2:s=insert(s);break; case 3:s=del(s);break; case 4:s=create();break; case 5:printf("bye bye!!!\n");exit(0); } }while(1);}