我写的代码在注释行有一个warning，我不知道应该强制转换成什么类型，求讲解强制转化的类型与谁对应

#include <stdio.h>
#include <stdlib.h>
typedef struct{
     char name[10];
     int page;
     char author[10];
     int price;
 }BOOK;
int main()
{
    int num,i;
    printf("Enter book's num:");
    scanf("%d",&num);
    BOOK* p=(char*)malloc(sizeof(char)*num); //这里有一个    [Warning] initialization from incompatible pointer type
    BOOK* q=p;
    for(i=0;i<num;i++,p++){
        printf("Enter book's name:");
        scanf("%s",&p->name);
        printf("\nEnter book's page:");
        scanf("%d",&p->page);
        printf("\nEnter book's author:");
        scanf("%s",&p->author);
        printf("\nEnter book's price:");
        scanf("%d",&p->price);
        printf("\n");
    }
    p=q;
    for(i=0;i<num;i++,p++){
        printf("book's name : %s",p->name);
        printf("\nbook's page : %d",p->page);
        printf("\nbook's author : %s",p->author);
        printf("\nbook's price : %d",p->price);
  }
  free(q);
  return 0;
}

  BOOK* p=(char*)malloc(sizeof(char)*num);
  
  BOOK* p=(BOOK*)malloc(sizeof(BOOK)*num);

懂了！