5

#include<stdio.h>
#include<stdlib.h>

typedef struct STOCK{
    char ID;
    char name;
    int price;
    int volume;
    struct STOCK *next;
}STOCK,*STOCKList;

STOCK *read(STOCK *L,int n){
    int i;
    for(i=0;i<n;i++){
        STOCKList p;
        p=new STOCK;
        printf("请输入商品ID:");
        scanf("%s",&p->ID);
        printf("请输入商品名称:");
        scanf("%s",&p->name);
        printf("请输入商品价格:");
        scanf("%d",&p->price);
        printf("请输入商品库存量:");
        scanf("%d",&p->volume);
        p->next=L->next;
        L->next=p;
    }
}
STOCK *find(STOCK *L,int index){
    STOCK *p=L->next;
    while(p){
        if(p->ID==index){
            return p;
        }
        p=p->next;
    }
    return NULL;
}
void release(STOCK *head){
    STOCK *p=head->next,*pre=head;
    while(p){
        pre=p;
        p=pre->next;
        pre->next=p->next;
        free(p);
    }
}
int main(){
    STOCKList List;
    int num;
    List=(STOCK*)malloc(sizeof(STOCK));
    List->next=NULL;
    printf("请输入商品类数：");
    scanf("%d",&num);
    read(List,num);
    int x;
    printf("请输入您要找的商品的ID：");
    scanf("%d",&x);
    find(List,x);
    release(List);
    return 0;
}