定义一个结构体用于保存员工信息，写入文件后并将其显示出来

#include<stdio.h>
#include<stdlib.h>
typedef struct
{
 int ID;
 char name[20];
 float salary;
}employee;
int main()
{
 employee e[3]={
  {1001,"Lucy",4500},
  {1002,"Jim",5000},
  {1003,"James",4800}
 };
 FILE* fp=NULL;
 if((fp=fopen("d.txt","w+"))==NULL)
 {
  perror("文件打开失败！"),exit(0);
 }
 printf("文件打开成功！");
 int count=0;
 if((count=fwrite(e,sizeof(e),3,fp))<3)
 {
  perror("写入失败\n");
 }
 fseek(fp,-3*sizeof(employee),SEEK_CUR);
 employee t;
 int i;
 for(i=0;i<3;i++)
 {
  fread(&t,sizeof(employee),1,fp);
  printf("%d,%s,%.3f\n",t.ID,t.name,t.salary);
 }
 fclose(fp);
 return 0;
}