程序代码：

void display(worker a[],int n)            //显示操作
{
     int i=0;
     if(n==0)
     {
         printf("Files are empty\n");
         return;
     }
     do
     {
         printf("----------------------------\n");
         printf("职工的工号为%s\n",a[i].num);
         printf("职工的姓名为%s\n",a[i].name);
         printf("职工的性别：%s\n",a[i].sex);
         printf("职工的所属二级单位：%s\n",a[i].danwei);<--这里不是%s,而是%d
         printf("职工的所学专业：%s\n",a[i].majoy);
         printf("职工的职称：%s\n",a[i].call);
         printf("职工的月工资：%d\n",a[i].salary);
         printf("职工的电话号码：%s\n",a[i].tell);
         i++;
     }while(i<n);
}