C-学生管理系统

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<string.h>
typedef struct
{
	int num;
	char name[64];
	char sex;
	float score;
}S;

void menu(void);
int Showeveryone(S s[]);
int Add(S s[]);
int Del(S s[]);
int Find(S s[]);
int Change(S s[]);
S tmp;
S s[100] = { 0 };
void menu(void)
{
	printf("**************学生管理系统*******************\n");
	printf("***1.添加学生                  2.删除学生****\n");
	printf("***3.查找学生                  4.修改学生信息\n");
	printf("***5.显示所有已存在的学生(排序)  0.exit  *****\n");
}

int main()
{
	int n = 0;
	while (1)
	{
		menu();
		printf("请输入您要做的选项\n");
		//again:
		scanf("%d", &n);
		switch (n)
		{
		case 1:Add(s); break;
		case 2:Del(s); break;
		case 3:Find(s); break;
		case 4:Change(s); break;
		case 5:Showeveryone(s); break;
		case 0:return 0;
		default:printf("抱歉输入错误,请重新输入\n");
			//goto again;
		}
	}
	return 0;
}
int Add(S s[])
{
	printf("请输入学生信息\n");
	for (int i = 0; i < 100; i++)
	{
		if (s[i].num == 0)
		{
			int num1 = 0;
			char name1[64];
			char sex1;
			float score1;
		t:
			printf("请输入学号\n");
			scanf("%d", &num1);//学号
			for (int j = 0; j < 100; j++)
			{
				if (s[j].num == num1)
				{
					printf("抱歉，该学号已被占用\n");
					goto t;
				}
			}
			s[i].num = num1;
			printf("请输入名字\n");
			scanf("%s", name1);
			strcpy(s[i].name, name1);//名字
			getchar();
			printf("请输入性别\n");
			scanf("%c", &sex1);
			s[i].sex = sex1;//性别
			getchar();
			printf("请输入成绩\n");
			scanf("%f", &score1);
			s[i].score = score1;//成绩
			printf("\n");
			printf("录入完成\n");
			break;
		}
	}
}
int Del(S s[])
{
	printf("请输入要删除的学生的学号\n");
	int Del1 = 0;
	scanf("%d", &Del1);
	int i = 0;
	for (i = 0; i < 100; i++)
	{
		if (s[i].num == Del1)
		{
			s[i].num = 0;
			strcpy(s[i].name, "0");
			s[i].sex = 0;
			s[i].score = 0;
			printf("删除完成\n");
			break;
		}
	}
	if (i == 100)
	{
		printf("查找不到该学生\n");
	}
}
int Find(S s[])
{
	printf("请输入要查找的学生学号\n");
	int f1 = 0;
	int j = 0;
	scanf("%d", &f1);
	for (j = 0; j < 100; j++)
	{
		if (s[j].num == f1)
		{
			printf("该学生学号为%d\t", s[j].num);
			printf("该学生名字为%s\t", s[j].name);
			printf("该学生性别为%c\t", s[j].sex);
			printf("该学生成绩为%f", s[j].score);
			printf("\n");
			break;
		}
	}
	if (j == 100)
	{
		printf("查找不到该学生\n");
	}
}
int Change(S s[])
{
	printf("请输入要修改的学生学号\n");
	int c1 = 0;
	int c = 0;
	int num2;
	char name2[64];
	char sex2;
	float score2;
	scanf("%d", &c1);
	for (c = 0; c < 100; c++)
	{
		if (s[c].num == c1)
		{
			printf("请输入要修改的\n");
			printf("学号\t名字\t性别\t成绩\n");
			scanf("%d", &num2);
			s[c].num = num2;
			scanf("%s", name2);
			strcpy(s[c].name, name2);
			getchar();
			scanf("%c", &sex2);
			s[c].sex = sex2;
			scanf("%f", &score2);
			s[c].score = score2;
			printf("修改完毕\n");
			break;
		}
	}
	if (c == 100)
	{
		printf("查找不到该学生\n");
	}
}
int Showeveryone(S s[])
{
	for (int i = 0; i < 99; i++)
	{
		for (int j = 0; j < 99 - i; j++)
		{
				if (s[j].score <= s[j + 1].score)
			{
				tmp = s[j];
				s[j]= s[j + 1];
				s[j + 1]= tmp;
			}
		}
	}
	for (int i = 0; i < 100; i++)
	{
		if (s[i].num != 0)
		{
			printf("该学生学号为%d\t", s[i].num);
			printf("该学生名字为%s\t", s[i].name);
			printf("该学生性别为%c\t", s[i].sex);
			printf("该学生成绩为%f", s[i].score);
			printf("\n");
		}
	}
	
}