程序代码：

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


struct Employee
{
    char name[20];
    char sex[5];
    char deparment[20];
    double pay;
    
};

void SaveEmp(struct Employee[],int,int);//保存员工数据
void LoadEmp(struct Employee[],int *);//载入员工数据
void Result(struct Employee[],int *);//浏览员工信息
void Revise(struct Employee[],int *);//修改员工信息

void NewSaveEmp(struct Employee[],int);//覆盖保存数据

void NewSaveEmp(struct Employee emp[],int emp_number)
{
    FILE * fp;
    int i = 0;
    fopen("emp.dat", "wb");
    for(i = 0;i < emp_number; i++)
    {
        if(fwrite(&emp[i], sizeof(struct Employee), 1, fp) != 1 )
        {
            printf("写入失败！\n");
        }
        
    }
    fclose(fp);
}

void LoadEmp(struct Employee emp[],int * emp_number)
{
    FILE * fp;
    int i = 0;
    if((fp = fopen("emp.dat","rb"))==NULL)
    {
        printf("无法打开员工数据文件\n");
        exit(0);
    }

    while (fread(&emp[i], sizeof(struct Employee), 1, fp) == 1 && i < 50)
    {
        i++;
    }

    * emp_number = i;
    if (feof(fp))
    {
        fclose(fp);
    }

}


void Result(struct Employee emp[],int * emp_number)
{

    system("cls");
    system("title 员工信息");
    printf("\n\n\n\n\t\t读取中...");
    Sleep(2000);
    system("cls");
    LoadEmp(emp,emp_number);
    printf("\n\n\t\t员工信息：\n\n\n");
    printf("\t\t姓名        性别        部门      工资");
    for (int i = 0; i < * emp_number; i++)
    {
        
         printf("\n\n\t\t%-10s  %-10s %-10s %-15.2f",emp[i].name,emp[i].sex,emp[i].deparment,emp[i].pay);
         printf("\n\n");
    }
    printf("\n\n\n");
    system("pause");
    
}

void Revise(struct Employee emp[],int * emp_number)
{
    int i,find = 0;
    char str[20];
    char c,ch = 'y';
    system("cls");
    system("title 修改信息");
    fflush(stdin);
    LoadEmp(emp,emp_number);
    printf("\n\t\t--------------------修改员工信息------------------\n");
    while ((ch=='y')||(ch=='Y'))
    {
        printf("\n\n\t\t请输入员工的姓名：");
        scanf("%s",str);
    
        for (i = 0;i < * emp_number;i++)
        {
            if (strcmp(str, emp[i].name) == 0)
            {
                printf("\n\n\t\t您要修改的员工信息为：\n\n\n");
                printf("\t\t姓名        性别        部门      工资");
                printf("\n\n\t\t%-10s  %-10s %-10s %-15.2f",emp[i].name,emp[i].sex,emp[i].deparment,emp[i].pay);
                find = 1;
                break;
            }
        }
        fflush(stdin);

        if (find = 1)
        {
            printf("\n\n\t\t请重新输入修改的员工信息为：\n\n\n");
            
            printf("\n\t\t员工的姓名：");
            scanf("%s",emp[i-1].name);
            printf("\n\t\t员工的性别：");
            scanf("%s",emp[i-1].sex);
            printf("\n\t\t员工的部门：");
            scanf("%s",emp[i-1].deparment);
            printf("\n\t\t员工的工资：");
            scanf("%lf",&emp[i-1].pay);
            fflush(stdin);
            printf("\n\t\t是否继续修改员工信息(y/n)?：");
            scanf("%c",&ch);
            fflush(stdin);
        }
        else
        {
            printf("\n\t\t输入的名字错误！\n");

        }
    }
    NewSaveEmp(emp,* emp_number);//重新生成数据文件
    system("cls");
    
    system("pause");
    

}

    
int main(void)
{
    struct Employee emp[50];
    int choose,emp_number = 0;
        Revise(emp,&emp_number);
        Result(emp,&emp_number);
            

    return 0;
}