void xiugai()   /*修改模块*/ 
{
	system ("color 5F");
	int lgl=1;  
	int x,i=0,k;
    long int xuehao;  
	char name[10];
    struct stu *p;
	FILE *tp;
	int lgl1=1;
    while(lgl1==1)
	{
	system("cls");    /*清屏*/
    printf("     |==========================================|\n");
    printf("     |             请选择修改的人               |\n");
	printf("     |==========================================|\n");
    printf("     |            1.学号     2.姓名             |\n");
    printf("     |==========================================|\n");
    printf("     |                 3.取消                   |\n");
    printf("     |==========================================|\n");
	printf("  请选择：");
    scanf("%d",&x);
	switch(x)
	{case 1: 
	printf("请输入要修改的学生学号：");
	scanf("%ld",&xuehao);
    for(p=s;p<s+N;p++)
	{if(p->xuehao==xuehao)
	{
	i=1;
	int j;  //菜单选择项//
	while(lgl==1)
	{
	system("cls");    /*清屏*/
    printf("\n\n");
	printf("      |=======================================|\n");
	printf("      |          请选择要修改的项目：         |\n");
    printf("      |=======================================|\n");
	printf("      |         1.性别       2.年龄           |\n");
    printf("      |=======================================|\n");
	printf("      |         3.出生日期   4.地址           |\n");
    printf("      |=======================================|\n");
	printf("      |         5.电话号码   6.mail           |\n");
    printf("      |=======================================|\n");
    printf("      |                7.取消                 |\n");
	printf("      |=======================================|\n");
	printf("请选择想要修改的项目1-7：");
	scanf("%d",&j);
	switch(j)
	{ case 1: printf("新性别：");  scanf("%s",p->sex);    break;
	case 2: printf("新年龄：");  scanf("%d",&p->age);    break;
	case 3: printf("新出生日期：");  scanf("%s",p->birth);    break;
	case 4: printf("新地址：");  scanf("%s",p->address);   break;
	case 5: printf("新电话号码：");  scanf("%s",p->phone);   break;
	case 6: printf("新mail：");  scanf("%s",p->mail);    break;
	case 7: break;
	}
	printf("修改后数据如下：\n");
	printf("% 6ld% 8s% 6s% 6d% 10s% 10s% 15s% 20s\n",p->xuehao,p->name,p->sex,p->age,p->birth,p->address,p->phone,p->mail);
	tp=fopen("xsxxk.txt","w");
	for(k=0;k<N;k++)
	fprintf(tp,"%ld\n%s\n%s\n%d\n%s\n%s\n%s\n%s\n",s[k].xuehao,s[k].name,s[k].sex,s[k].age,s[k].birth,s[k].address,s[k].phone,s[k].mail);
	fclose(tp);
	printf("修改已成功！是否继续修改此项目的其他数据：(Y/N)");
	char a; scanf("%s",&a); 
	if(a=='y'||a=='Y') lgl=1;
	if(a=='n'||a=='N') lgl=0; 
	 }
	printf("是否返回修改其他数据：(Y/N)"); 
	char b; 
	scanf("%s",&b); 
	if(b=='y'||b=='Y') lgl1=1;lgl=1;
	if(b=='n'||b=='N') lgl1=0;
	}}
	if(i==0) 
	{
		printf("\n\n对不起！您查询的数据不存在！\n是否返回菜单继续选择修改：(Y/N)"); 
	    char c; 
	    scanf("%s",&c); 
	    if(c=='y'||c=='Y') lgl1=1;
	    if(c=='n'||c=='N') lgl1=0;}
	    break;
	case 2:  
	printf("请输入要修改的学生姓名：");
	scanf("%s",name);
	for(p=s;p<s+N;p++)
	{
		if(strcmp(p->name,name)==0)
		{i=1;
		int j;  //菜单选择项
		while(lgl==1)
		{system("cls");    /*清屏*/
		printf("\n\n");
	    printf("      |============================|\n");
        printf("      |============================|\n");
        printf("      |     请选择要修改的项目：   |\n");
        printf("      |============================|\n");
    	printf("      |    1.性别       2.年龄     |\n");
        printf("      |============================|\n");
	    printf("      |    3.出生日期   4.地址     |\n");
        printf("      |============================|\n");
	    printf("      |    5.电话号码   6.mail     |\n");
        printf("      |============================|\n");
        printf("      |           7.取消           |\n");
        printf("      |============================\n");
	    printf("      |===========================|\n");
	    printf("请选择想要修改的项目1-7：");
	    scanf("%d",&j);
	    switch(j)
		{ case 1: printf("新性别：");  scanf("%s",p->sex);    break;
	    case 2: printf("新年龄：");  scanf("%d",&p->age);    break;
	    case 3: printf("新出生日期：");  scanf("%s",p->birth);    break;
	    case 4: printf("新地址：");  scanf("%s",p->address);   break;
	    case 5: printf("新电话号码：");  scanf("%s",p->phone);   break;
	    case 6: printf("新mail：");  scanf("%s",p->mail);    break;
	    case 7: break;
		}
	    printf("修改后如下：\n");
	    printf("% 6ld% 8s% 6s% 6d% 10s% 10s% 15s% 20s\n",p->xuehao,p->name,p->sex,p->age,p->birth,p->address,p->phone,p->mail);
	    tp=fopen("xsxxk.txt","w");
	    for(k=0;k<N;k++)
	    fprintf(tp,"%ld\n%s\n%s\n%d\n%s\n%s\n%s\n%s\n",s[k].xuehao,s[k].name,s[k].sex,s[k].age,s[k].birth,s[k].address,s[k].phone,s[k].mail);
	    fclose(tp);
	    printf("修改已成功！是否继续修改此项目的其他数据：(Y/N)");
	    char d; scanf("%s",&d); 
	    if(d=='y'||d=='Y') lgl=1;
	    if(d=='n'||d=='N') lgl=0;}
	    printf("是否返回修改其他数据：(Y/N)"); 
		char e; scanf("%s",&e);
		if(e=='y'||e=='Y') lgl1=1; lgl=1;
	    if(e=='n'||e=='N') lgl1=0;
	}}
	if(i==0) 
	{printf("\n\t对不起！您查询的数据不存在！\n是否返回菜单继续选择修改：(Y/N)"); 
	char m; scanf("%s",&m); 
	if(m=='y'||m=='Y') lgl1=1;
	if(m=='n'||m=='N') lgl1=0;}
	
	break;
	case 3:  
		system("cls");
		lgl1=0; break;
	}}
}