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

struct stock
{
        char name[20];
        int price;
};


int main()
{

    FILE *file;
    file = fopen("./stockInfo.txt",    "r");
    if(file == NULL)
    {
            printf("open file failed!\n");    
            exit(-1);
    }

    struct stock buffer;
    while(!feof(file))
    {
            fscanf(file, "%s %d", buffer.name, &buffer.price);
            printf("%s %d", buffer.name, buffer.price);
    }
    
    return 0;
}

    while(!feof(file)) 
 /*fscanf到达文件尾时，并没有立刻执行feof(file)，
  *而是在printf之后才去检测是否到达文件尾的.
  *因此会再一次输出buffer的内容
  *而你也没有在读到buffer里面前memset，
  *所以最后一条会重复输出
  */
  {
            fscanf(file, "%s %d", buffer.name, &buffer.price);
            printf("%s %d", buffer.name, buffer.price);
    }

    while(1)
    {
        memset(&buffer,0x00,sizeof(struct stock));
            fscanf(file, "%s %d", buffer.name, &buffer.price);
        if(feof(file))break;/*到达文件尾立刻跳出*/
            printf("%s %d\n", buffer.name, buffer.price);
    }