1. 按以下菜单界面编写学生信息管理系统；
2. 

1）录入学生信息首先输入学生人数，然后根据学生人数开辟动态数组；

2）学生信息包括学号、姓名、性别、三门课成绩、总分；其中学号、姓名、

性别、三门课成绩是需要从键盘录入的，而总分是由程序计算的，而不

是用户自己算了再输入。

3）显示结果（学生信息）要以列表的形式显示，注意美观性；

4）要有必要的容错措施，比如输入各科分数要在0-100之间，输入错误给

用户提示，让其重新输入；

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<iostream>
#include<Windows.h>
#include<assert.h>
using namespace std;

typedef struct student
{
	char ID[15];
	char name[15];
	char sex[5];
	int score[3];
	int totalscore;
}student;

typedef struct Data
{
	student* data;
	int size;
	int capacity;
}Data;

enum Option
{
	EXIT,//0
	ADD,
	PRINT,
	SEARCH_BY_ID,
	SEARCH_BY_NAME,
	SORT,
	FIND_BY_SCORE
};

void menu()
{
	cout << "\n*************************\n";
	cout << "1.录入学生信息\n";
	cout << "2.显示学生信息\n";
	cout << "3.按学号查找\n";
	cout << "4.按姓名查找\n";
	cout << "5.按总分递减排序\n";
	cout << "6.查找有2科目不及格的学生信息\n";
	cout << "0.退出\n";
	cout << "*************************\n";
	cout << "请输入功能号0-6：";

}


void Init(Data* pdata)
{
	assert(pdata);
	cout << "输入学生人数:" << endl;
	cin >> pdata->capacity;
	pdata->data = (student*)malloc(sizeof(student) * (pdata->capacity));
	pdata->size = 0;
	for (int i = 0; i < pdata->capacity; i++)
	{
		pdata->data[i].totalscore = 0;
	}

}
void fun1(Data*pdata)
{
	int flag = 0;
	if (pdata->size==pdata->capacity)
	{
		cout << "容量不够，无法输入" << endl;
		return;
	}
	
	cout << "输入学号：";
	scanf("%s",pdata->data[pdata->size].ID);
	cout << "输入姓名：";
	scanf("%s", pdata->data[pdata->size].name);
	cout << "输入性别：";
	scanf("%s", pdata->data[pdata->size].sex);
	
	do {
		cout << "输入三科成绩：";
		for (int i = 0; i < 3; i++)
		{
			scanf("%d", &pdata->data[pdata->size].score[i]);
			if (pdata->data[pdata->size].score[i] > 100 || pdata->data[pdata->size].score[i] < 0)
			{
				flag = 1;
			}//如果输入成绩不合法
			pdata->data[pdata->size].totalscore += pdata->data[pdata->size].score[i];
		}
		if (flag == 1)
		{
			cout << "成绩输入不合规，重新输入" << endl;
		}
	} while (flag != 0);
	cout << "信息输入成功" << endl;
	pdata->size++;
}
void fun2(Data* pdata)//打印信息
{
	assert(pdata);
	printf("%-10s%-10s%-5s%-12s%-5s\n", "学号", "姓名", "性别", "成绩", "总成绩");
	for (int i = 0; i < pdata->size; i++)
	{
		printf("%-10s%-10s%-5s%-4d%-4d%-4d%-5d\n",
			pdata->data[i].ID, 
			pdata->data[i].name, 
			pdata->data[i].sex, 
			pdata->data[i].score[0],
			pdata->data[i].score[1],
			pdata->data[i].score[2],
			pdata->data[i].totalscore);
	}
}
void fun3(Data*pdata)
{
	cout << "\n请输入要查找的学号：\n";
	char IDinput[15]="\0";
	cin >> IDinput;
	for (int i = 0; i < pdata->size; i++)
	{
		if (strcmp(pdata->data[i].ID, IDinput) == 0)
		{
			printf("%-10s%-10s%-5s%-12s%-5s\n", "学号", "姓名", "性别", "成绩", "总成绩");
			printf("%-10s%-10s%-5s%-4d%-4d%-4d%-5d\n",
				pdata->data[i].ID,
				pdata->data[i].name,
				pdata->data[i].sex,
				pdata->data[i].score[0],
				pdata->data[i].score[1],
				pdata->data[i].score[2],
				pdata->data[i].totalscore);
			break;
		}
	}
}
void fun4(Data*pdata)
{
	cout << "\n请输入要查找的姓名：\n";
	char nameinput[15] = "\0";
	cin >> nameinput;
	printf("%-10s%-10s%-5s%-12s%-5s\n", "学号", "姓名", "性别", "成绩", "总成绩");
	for (int i = 0; i < pdata->size; i++)
	{
		if (strcmp(pdata->data[i].name, nameinput) == 0)
		{
			printf("%-10s%-10s%-5s%-4d%-4d%-4d%-5d\n",
				pdata->data[i].ID,
				pdata->data[i].name,
				pdata->data[i].sex,
				pdata->data[i].score[0],
				pdata->data[i].score[1],
				pdata->data[i].score[2],
				pdata->data[i].totalscore);
		}
	}
}
int compare(const void* a, const void* b)
{
	return ((student*)b)->totalscore - ((student*)a)->totalscore;
}
void fun5(Data*pdata)//排序
{
	qsort(pdata->data, pdata->size, sizeof(student), compare);
	fun2(pdata);
}
void fun6(Data* pdata)
{
	for (int i = 0; i < pdata->size; i++)
	{
		int flag = 0;
		for (int j = 0; j < 3; j++)
		{
			if (pdata->data[i].score[j] < 60)
			{
				flag++;
			}
		}
		if (flag >= 2)
		{
			printf("%-10s%-10s%-5s%-4d%-4d%-4d%-5d\n",
				pdata->data[i].ID,
				pdata->data[i].name,
				pdata->data[i].sex,
				pdata->data[i].score[0],
				pdata->data[i].score[1],
				pdata->data[i].score[2],
				pdata->data[i].totalscore);
		}
	}
}

int main()
{
	int input = 0;

	Data data;

	Init(&data);
	do
	{
		menu();
		printf("请输入你的选择:>");
		scanf("%d", &input);
		system("cls");
		switch (input)
		{
		case ADD:
			fun1(&data);
			break;
		case PRINT:
			fun2(&data);
			break;
		case SEARCH_BY_ID:
			fun3(&data);
			break;
		case SEARCH_BY_NAME:
			fun4(&data);
			break;
		case SORT:
			fun5(&data);
			break;
		case FIND_BY_SCORE:
			fun6(&data);
			break;
		case EXIT:
			fun2(&data);
			printf("退出通讯录\n");
			break;
		default:
			printf("选择错误，重新选择\n");
			break;
		}
	} while (input);
	return 0;
}

测试用例可以自己简单测一测

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