兼套使用Switch不能传值，求解。

[LogansCodingLife]

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 2
struct Student
{
	int number;
	char name[20];
	float chinese,math,english;
};
void login();
void display_menu();
void showMenu();
int inputInfo(struct Student student[],int length);
int outputInfo(struct Student student[],int length);
int statistic(struct Student student[],int length);
int bubblesort(struct Student student[],int length);
int main()
{
	login();
	int choice;char name[20];
	struct Student student[N];
	display_menu();
	start:
	printf("Please input your choice:");
	scanf("%d",&choice);
	switch(choice)
	{
		case 1:inputInfo(student,N);break;
		case 2:output(student,N);break;
		case 3:queryInfo(student,name);break;
		case 4:statistic(student,N);break;
		case 5:exit(0);
		default:printf("Wrong input!");break;
	}
	goto start;
	return 0;
}
void login()    
{
	int password;
	printf("请输入口令:");
	scanf("%d",&password);
	if (password==123||password==111)
	printf("The key is right,Welcome to use this system !\n");
	else
	printf("The key is wrong,Please check it and try again!\n");
}
void display_menu()
{
	printf("= = = = = = 学生成绩管理系统= = = = = =\n");
	printf("=                                     =\n");
	printf("=               1  录入               =\n");
	printf("=               2  输出               =\n");
	printf("=               3  查询               =\n");
	printf("=               4  汇总统计           =\n");
	printf("=               5  结束               =\n");
	printf("=                                     =\n");
	printf("= = = = = =       HCG       = = = = = =\n");
	
}
int inputInfo(struct Student student[],int length)
{
	int i;
	printf("Please input the student's Infomation(enter 0 to end):\n");
	for(i=0;i<length;i++)
	{
		fflush(stdin);
		printf("学号：");
		scanf("%d",&student[i].number);
		if(student[i].number==0)break;
		printf("Name:");
		scanf("%s",student[i].name);
		printf("Chinese:");
		scanf("%f",&student[i].chinese);
		printf("Math:");
		scanf("%f",&student[i].math);
		printf("English:");
		scanf("%f",&student[i].english);
	}
}
int output(struct Student student[],int length)
{
	int i;
	for(i=0;i<N;i++)
	{
		printf("Student number:%d\n",student[i].number);
		printf("Name:%s\n",student[i].name);
		printf("Chinese score:%f\n",student[i].chinese);
		printf("Math score:%f\n",student[i].math);
		printf("English score:%f\n",student[i].english);
	}
}
int queryInfo(struct Student find[],char n[])
{
	int i;
	puts("Please enter the students name you want to find:");
	scanf("%s",n);
	for(i=0;i<N;i++)
	{
		if(strcmp(n,find[i].name)==0)
		{
			printf("student number:%d \n name:%s \n chinese score:%f \n math score:%f \n English score:%f",find[i].number,
			find[i].name,find[i].chinese,find[i].math,find[i].english);
		}
		if(i>=N)puts("Not exist!\n"); 
	}
}
int statistic(struct Student student[],int length)
{
	int choice;
	showMenu();
	start:
	printf("Please input your choice:");
	scanf("%d",&choice);
	switch(choice)
	{
		case 1:{bubblesort(student,5);break;}
		case 4:exit(0);
		default:printf("Haven't developed yet !\n");break;
	}
	goto start;
}
int bubblesort(struct Student student[],int length)
{
	int i,max,temp,n;
	for(i=0;i<length;i++)
	{
		for(max=0;max<length;max++)
		{
		if(student[i].chinese>student[max].chinese)
		{
			temp=student[i].number;
			student[i].number=student[max].number;
			student[max].number=temp;
		}
		}
	}
	for(n=0;i<length;i++)
	{
	printf("%d",student[i].number); 
	}
}
void showMenu()
{
	printf("= = = = = = 学生成绩管理系统= = = = = =\n");
	printf("=                                     =\n");
	printf("=               1  语文成绩           =\n");
	printf("=               2  数学成绩           =\n");
	printf("=               3  英语成绩           =\n");
	printf("=               4  结束               =\n");
	printf("=                                     =\n");
	printf("= = = = = =       HCG       = = = = = =\n");
}

录入后选择4的汇总统计，再选择1的语文成绩进行冒泡排序。bubblesort函数里的结构体student没有接收录入的值是什么情况？？难倒兼套使用switch后值就清零了？还是我哪里弄错了。

[yubao669016]

for(i=0;i<length-1;i++) { for(max=0;max<length-i-1;max++) { if(student[max].chinese>student[max+1].chinese) { temp=student[max].chinese; student[max].chinese=student[max+1].chinese; student[max+1].chinese=temp; } } } 这是冒泡法， for(n=0;i<length;i++) { printf("%d",student[i].number); }你把里面的i改成n或者把n改成i就行了。 其实你的switch没错，还有给你点建议：可以用while代替goto，能少用goto就尽量少用吧

[LogansCodingLife]

引用 2 楼 yubao669016 的回复:

for(i=0;i<length-1;i++) { for(max=0;max<length-i-1;max++) { if(student[max].chinese>student[max+1].chinese) { temp=student[max].chinese……

问题出在坑爹的n 和i 上面。。 粗心啊。 其它的都没有问题。

[liutengfeigo]

买本 代码大全2 看看?

[漫步者、]

跟switch没有关系，你自己断点调试一下

[LogansCodingLife]

引用 4 楼 lthyxy 的回复:

买本 代码大全2 看看?

呵呵，我是自学的，恩，快学完了。 快一个月了，然后再看看《代码大全》。这书貌似不错的样子。