编写一个C语言程序，用冒泡法对改学生信息表按成绩从高到低进行排序

参考：

#include "stdio.h"

#define N 2
struct student{
	int id;
	char name[20];
	int kaoqun;
	int biaoxian;
	int zuoye;
	int biji;
	int sum;
}stud[N],t;

int main()
{
	int i,j;
	for(i=0;i<N;i++){
		printf("请输入第%d个学生信息\n",i+1);
		scanf("%d %s",&stud[i].id,&stud[i].name);
		fflush(stdin);
		scanf("%d %d %d %d",&stud[i].kaoqun,&stud[i].biaoxian,&stud[i].zuoye,&stud[i].biji);
		stud[i].sum = stud[i].kaoqun*0.3+stud[i].biaoxian*0.3+stud[i].zuoye*0.3+stud[i].biji*0.1;
	}
	
	//排序
	
	for (i = 0; i < N - 1; i++){
	    for (j = 0; j < N - 1 - i; j++){ //按成绩对学生信息进行排序
	        if (stud[j].sum > stud[j + 1].sum){ //整型数字的比较
	            t = stud[j];
	            stud[j] = stud[j + 1];
	            stud[j + 1] = t;
	        }
	    }
	}
	//打印
	printf("学号\t姓名\t考勤\t表现\t作业\t笔记\t总分\t\n");
    for (i = 0; i < N; i++){
        printf("%d\t", stud[i].id);
        printf("%s\t", stud[i].name);
        printf("%d\t", stud[i].kaoqun);
        printf("%d\t", stud[i].biaoxian);
        printf("%d\t", stud[i].zuoye);
        printf("%d\t", stud[i].biji);
        printf("%d \n", stud[i].sum);
    }
	
    return 1;
}

定义学生结构，按照成绩双循环遍历进行结构成员的交换

struct student
{
    int num;
    char name[20];
    char sex;
    int age;
    float grade;
}stu[100];
int stunum = 0;
void main()
{
    printf("请输入学生数量:");
    scanf("%d",&stunum);
    int i,j;
    struct student s;
    for(i=0;i<stunum;i++)
        scanf("%d %s %c %d %d",&stu[i].num,stu[i].name,&stu[i].sex,&stu[i].age,&stu[i].grade);
    for(i=0;i<stunum-1;i++)
        for(j=0;j<stunum-i-i;j++)
        {
            if(stu[j].grade > stu[j+1].grade)
            {
                s = stu[j];
                stu[j] = stu[j+1];
                stu[j+1] = t;
            }
        }
    printf("%10s%20s%10s%10s%10s\n","学号","姓名","性别","年龄","成绩");
    for(i=0;i<stunum;i++)
        printf("%10d%20s%10c%10d%10d\n",stu[i].num,stu[i].name,stu[i].sex,stu[i].age,stu[i].grade);
}