程序代码：

     #include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#define TYPE struct Chose
#define endinput printf("输入0，0结束")
TYPE
{
    int num;
    float price;
    TYPE * next;
};

int n;

void menu()
{
    printf("提示：\n");
    printf("1.首次输入：\n");
    printf("2.补充输入：\n");
    printf("3.存盘：\n");
    printf("4.读取：\n");
    printf("5.删除：\n");
    printf("6.修改：\n");
    printf("7.退出：\n");
}

void save(TYPE * head)
{
    FILE * fp;
    TYPE * p;
    if((fp=fopen("mk.txt","w"))==NULL)
    {
        printf("cannot open infile\n");
        exit(0);
    }
    for(p=head;p!=NULL;p=p->next)
    {
        if((fprintf(fp,"%d,%f",p->num,p->price)!=1))
            printf("file write error\n");
    }
    fclose(fp);
   
}


void load(TYPE * head)
{
    FILE * fp;
    TYPE u[20];
    TYPE * p;
    int i;
    if((fp=fopen("mk.txt","r"))==NULL)
    {
        printf("cannot open infile\n");
        exit(0);
    }
    p=head;
    for(i=0;i<100;i++)
    {
        fscanf(fp,"%d,%f",&u[i].num,&u[i].price);
        if(u[i].num='\0')
            break;
        p->num=u[i].num;
        p->price=u[i].price;
        p=p->next;
    }
    p->next=NULL;
}
    



/*TYPE * load()
{
    FILE * fp;
    TYPE * p,* q,* head;
    int c=0;
    if((fp=fopen("mk.txt","r"))==NULL)
    {
        printf("cannot open infile\n");
        exit(0);
    }
    q=p=(TYPE *)malloc(sizeof (TYPE));
    fscanf(fp,"%d,%f",&q->num,&q->price);
    printf("1");
    head=NULL;
    while(q->num!=0)
    {
        c=c+1;
        if(c==1) head=q;
        else p->next=q;
        p=q;
        q=(TYPE *)malloc(sizeof (TYPE));
        fscanf(fp,"%d,%f",&q->num,&q->price);
    }
    p->next=NULL;
    fclose(fp);
    return(head);
}*/

/*
    for(p=head;p!=NULL;p=p->next)
    {
        if((fscanf(fp,"%d号菜,价格：%f\n",p->num,p->price)!=1))
            printf("file write error\n");
        fclose(fp);
    }
*/


TYPE * creat()
{
    TYPE * head;
    TYPE * p1,* p2;
    n=0;
    p1=p2=(TYPE *)malloc(sizeof (TYPE));
    scanf("%d,%f",&p1->num,&p1->price);
    head=NULL;
    while(p1->num!=0)
    {
        n=n+1;
        if(n==1) head=p1;
        else p2->next=p1;
        p2=p1;
        p1=(TYPE *)malloc(sizeof (TYPE));
        scanf("%d,%f",&p1->num,&p1->price);
    }
    p2->next=NULL;
    return(head);
}


   
void main()
{
    TYPE *p,*t,*head,*q;
    int i=1,k;
    float b;
    while(i)
    {
        menu();
        scanf("%d",&i);
        switch(i)
        {
        case 1:
            printf("输入菜的编码和价格（num，price）\n");
            //endinput;
            head=creat();
            for(p=head;p!=NULL;p=p->next)
            {
                printf("%d号菜,价格：%f\n",p->num,p->price);
            }
            break;
       
        case 2:
            printf("补充菜的编码与价格（num，price）\n");
            for(p=head;p!=NULL;p=p->next)
            {
                if(p->next==NULL)
                    break;
            }
            t=(TYPE * )malloc(sizeof (TYPE));
            scanf("%d,%f",&t->num,&t->price);
            p->next=t;
            p=t;
            p->next=NULL;
            for(p=head;p!=NULL;p=p->next)
            {
                printf("%d号菜,价格：%f\n",p->num,p->price);
            }
            break;

        case 3:save(head);
            //save();
            break;

        case 4:load(head);
            for(p=head;p!=NULL;p=p->next)
            {
                printf("%d,%f\n",p->num,p->price);
            }
            break;


        case 5:
            printf("需要删除的菜的编号（num）\n");
            scanf("%d",&k);
            for(p=head;p!=NULL;q=p,p=p->next)
            {
                if(p->num==k)
                    break;
            }
            if(p->next!=NULL)
            {
                q->next=p->next;
                free(p);
            }
            else
            {
                q->next=NULL;
                free(p);
            }
            for(p=head;p!=NULL;p=p->next)
            {
                printf("%d号菜,价格：%f\n",p->num,p->price);
            }
            break;


        case 6:
            printf("需要修改的菜和的编号（num）\n");
            scanf("%d",&k);
            printf("需要修改的菜和的价格（price）\n");
            scanf("%f",&b);
            for(p=head;p!=NULL;p=p->next)
            {
                if(p->num==k)
                    break;
            }
            p->price=b;
             for(p=head;p!=NULL;p=p->next)
            {
                printf("%d号菜,价格：%f\n",p->num,p->price);
            }
            break;

        case 7:
            printf("退出\n");
            i=0;
            break;

        default:
            printf("没有此选项~\(≧▽≦)/~啦啦啦\n");
        }
    }
    printf("欢迎使用，再见！=v=\n");
}