求大神帮助 学生号码管理系统 不知道咋修改TAT求帮简化帮修改谢谢！！
#include<stdio.h>#include<string.h>
/*定义学生结构体*/
struct Student
{
char ID[20];
char Name[20];
long n;
};
/*声明学生数组及学生数量*/
struct Student students[1000];
int num=0;
/*通过学号返回数组下标*/
int Student_SearchByIndex(char id[])
{
int i;
for (i=0;i<num;i++)
{
if (strcmp(students[i].ID,id)==0)
{
return i;
}
}
return -1;
}
/*通过姓名返回数组下标*/
int Student_SearchByName(char name[])
{
int i;
for (i=0;i<num;i++)
{
if (strcmp(students[i].Name,name)==0)
{
return i;
}
}
return -1;
}
/*显示单条学生记录*/
void Student_DisplaySingle(int index)
{
printf("%10s%10s%s\n","学号","姓名","电话");
printf("**************************************************\n");
printf("%10s%10s%s\n",students[index].ID,students[index].Name,students[index].n );
}
/*插入学生信息*/
void Student_Insert()
{
while(1)
{
printf("请输入学号:");
scanf("%s",&students[num].ID);
getchar();
printf("请输入姓名:");
scanf("%s",&students[num].Name);
getchar();
printf("请输入号码:");
scanf("%f",&students[num].n);
getchar();
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
/*修改学生信息*/
void Student_Modify()
{
//float n1,n2,n3;
while(1)
{
char id[20];
int index;
printf("请输入要修改的学生的学号:");
scanf("%s",&id);
getchar();
index=Student_SearchByIndex(id);
if (index==-1)
{
printf("学生不存在!\n");
}
else
{
printf("你要修改的学生号码为:\n");
Student_DisplaySingle(index);
printf("** 请输入新值**\n");
printf("请输入学号:");
scanf("%s",&students[index].ID);
getchar();
printf("请输入姓名:");
scanf("%s",&students[index].Name);
getchar();
printf("请输入号码:");
scanf("%f",&students[index].n);
getchar();
}
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
/*删除学生信息*/
void Student_Delete()
{
int i;
while(1)
{
char id[20];
int index;
printf("请输入要删除的学生的学号:");
scanf("%s",&id);
getchar();
index=Student_SearchByIndex(id);
if (index==-1)
{
printf("学生不存在!\n");
}
else
{
printf("你要删除的学生号码为:\n");
Student_DisplaySingle(index);
printf("是否真的要删除?(y/n)");
if (getchar()=='y')
{
for (i=index;i<num-1;i++)
{
students[i]=students[i+1];//把后边的对象都向前移动
}
num--;
}
getchar();
}
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
/*按姓名查询*/
void Student_Select()
{
while(1)
{
char name[20];
int index;
printf("请输入要查询的学生的姓名:");
scanf("%s",&name);
getchar();
index=Student_SearchByName(name);
if (index==-1)
{
printf("学生不存在!\n");
}
else
{
printf("你要查询的学生号码为:\n");
Student_DisplaySingle(index);
}
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
/*显示学生信息*/
void Student_Display()
{
int i;
printf("%10s%10s%s\n","学号","姓名","号码");
printf("\n");
for (i=0;i<num;i++)
{
printf("%10s%10s%s\n",students[i].ID,students[i].Name,
students[i].n);
}
}
/*将学生信息从文件读出*/
void IO_ReadInfo()
{
FILE *fp;
int i;
if ((fp=fopen("Database.txt","rb"))==NULL)
{
printf("不能打开文件!\n");
return;
}
if (fread(&num,sizeof(int),1,fp)!=1)
{
num=-1;
}
else
{
for(i=0;i<num;i++)
{
fread(&students[i],sizeof(struct Student),1,fp);
}
}
fclose(fp);
}
/*将学生信息写入文件*/
void IO_WriteInfo()
{
FILE *fp;
int i;
if ((fp=fopen("Database.txt","wb"))==NULL)
{
printf("不能打开文件!\n");
return;
}
if (fwrite(&num,sizeof(int),1,fp)!=1)
{
printf("写入文件错误!\n");
}
for (i=0;i<num;i++)
{
if (fwrite(&students[i],sizeof(struct Student),1,fp)!=1)
{
printf("写入文件错误!\n");
}
}
fclose(fp);
}
/*主程序*/
void main()
{
int n;
IO_ReadInfo();
while(1)
{
/*主菜单*/
printf("\n************欢迎来到学生手机号码管理系统************\n");
printf(" ************1.录入学生号码**********\n");
printf(" ************2.修改学生号码**********\n");
printf(" ************3.删除学生号码**********\n");
printf(" ************4.按姓名查询学生号码**********\n");
printf(" ************5.退出*************\n");
printf("请选择(1-5):");
scanf("%d",&n);
getchar();
switch(n)
{
case 1: Student_Insert();break;
case 2:Student_Modify(); break;
case 3:Student_Delete(); break;
case 4:Student_Select(); break;
case 5: exit(0);break;
}
IO_WriteInfo();
}
}
