BJFU-206-基于顺序存储结构的图书信息表的修改

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

#define MAX 1000
typedef struct{

   double no;
   char name[MAX];
   double price;

}Book;
int createList(Book b[]);
void traverse(Book b[],int len);
double average(Book b[],int len);
void add(Book b[],int len,double ave);
int main()
{
   Book book[MAX];
   int len;
   double ave;
   len = createList(book);
   ave = average(book,len);
   printf("%.2f
",ave);
   add(book,len,ave);
   traverse(book,len);

   return 0;
}
int createList(Book b[])
{
   int i=0;
   while(1)
   {
      scanf("%lf",&b[i].no);
      scanf("%s",&b[i].name);
      scanf("%lf",&b[i].price);

      if(b[i].no==0&&b[i].name[0]=='0'&&b[i].price==0)
        break;
      i++;
   }

   return i;
}
double average(Book b[],int len)
{
    double sum = 0;
    int i;
    for(i=0;i<len;i++)
    {
        sum = sum+b[i].price;
    }

    return sum/i;
}
void traverse(Book b[],int len)
{
    for(int i=0;i<len;i++)
    {
        printf("%.0lf ",b[i].no);
        printf("%s ",b[i].name);
        printf("%.2f",b[i].price);
        printf("
");
    }
}

void add(Book b[],int len,double ave)
{
   for(int i = 0;i<len;i++)
   {
       if(b[i].price<ave)
       {
           b[i].price = b[i].price*(1+0.2);
       }
       else
       {
           b[i].price = b[i].price*(1+0.1);
       }
   }
}