grade_manager.c

用Ｃ语言写的学生信息管理程序原代码 有排序

#include <stdio.h>
#include <stdlib.h>
#define N 50
struct student_info
{
	int sno;
	char name[81];
	int scores[3];
	double average;
};

struct student_info add_student_info();

void display_student_info(struct student_info stu[] , int size);

void sort_by_average(struct student_info stu[],int size);

int show_menu();

void insert_student_info(struct student_info stu[],int size);

void del_student_info(struct student_info stu[],int size);

int main(void)
{
	struct student_info students[N];
	int count = 0,choice;
	char ch = 'Y';

	printf("请输入学员的信息");
	do
	{
		students[count] = add_student_info();
		count++;
		printf("是否继续输入学员信息(y/n):");
		fflush(stdin);
	} while((ch = getchar()) != 'n' && count < N);


	printf("\n排序前学员信息为:");
	display_student_info(students,count);
	
	sort_by_average(students,count);
	
	printf("\n排序后学员信息为:");
	display_student_info(students,count);

	while(1)
	{
		choice = show_menu();
		switch(choice)
		{
			case 1:
				insert_student_info(students,count);
				count = (count > N) ? count : (count + 1);
				break;
			case 2:
				del_student_info(students,count);
				count = (count <= 0) ? 0 : (count - 1);
				break;
			case 3:
				display_student_info(students,count);
				break;
			case 4:
				exit(1);
				break;
			default:
				printf("请正确输入..");
		}
	}


}

struct student_info add_student_info()
{
	int i,sum = 0;
	struct student_info student;
	printf("\n请输入该学员的学号:");
	scanf("%d",&student.sno);

	fflush(stdin);
	printf("\n请输入该学员的姓名:");
	gets(student.name);

	printf("\n请输入该学员的三门考试成绩:");
	
	for(i = 0; i < 3; i++)
	{
		scanf("%d",&student.scores[i]);
		sum += student.scores[i];
	}

	student.average = sum / 3.0;

	return student;
}

void display_student_info(struct student_info stu[] , int size)
{
	int i;
	for(i = 0; i < size; i++)
	{
		printf("\n--------------------------------------------\n");
		printf("\n学号为:%d",stu[i].sno);
		printf("\n姓名为:%s",stu[i].name);
		printf("\n平均成绩为:%.1lf",stu[i].average);
		printf("\n--------------------------------------------\n\n");
	}
}

void sort_by_average(struct student_info stu[],int size)
{
	int i,j;
	struct student_info temp;
	for(i = 0; i < size - 1; i++)
	{
		for(j = 0; j < size - 1 - i; j++)
		{
			if(stu[j].average < stu[j + 1].average)
			{
				temp = stu[j];
				stu[j] = stu[j + 1];
				stu[j + 1] = temp;
			}
		}
	}
}

int show_menu()
{
	int choice;
	printf("\n1.插入学员信息");
	printf("\n2.删除学员信息");
	printf("\n3.显示学员信息");
	printf("\n4.退出");

	printf("\n请选择.....");
	scanf("%d",&choice);

	return choice;
}

void insert_student_info(struct student_info stu[],int size)
{
	struct student_info student;
	int i,location = -1;
	if(size >= N)
	{
		printf("\n数组一满,请先删除..");
		return;
	}
	
	student = add_student_info();

	
	for(i = 0; i < size; i++)     //查找相应的位置
	{
		if(student.average > stu[i].average)
		{
			break;
		}
	}

	location = i;

	for(i = size; i >= location; i--)    //移动元素
	{
		stu[i + 1] = stu[i];
	}

	stu[location] = student;           //插入
}

void del_student_info(struct student_info stu[],int size)
{
	int sno,i,location = -1;
	if(size <= 0)
	{
		printf("当前没有学员的信息...");
	}
	else
	{
		printf("请输入要删除的学员的学号:");
		scanf("%d",&sno);
		for(i = 0; i < size; i++)  //查找要删除的学号,记录位置
		{
			if(stu[i].sno == sno)
			{
				break;
			}
		}

		location = i;

		for(i = location; i < size; i++)
		{
			stu[i] = stu[i + 1];
		}
	}
}