简单的学生成绩管理系统

Posted 2020-09-21 稳住能赢

#include<stdio.h>
struct Stu
{
	char Name[12];
	int ID;
	int Math;
	int Chinese;
	int English;
};
struct Stu Student[100];
void Menu()
{
	puts("1.Browse");
	puts("2.Add");
	puts("3.Delete");
	puts("4.Modify");
	puts("5.Find");
	puts("0.Exit");
}
void Browse()
{
	int i = 0;
	puts("Name\tIDnumber\tMath\tChinese\tEnglish\n");
	while (Student[i].ID != 0)
	{
		if (Student[i].ID != -1)
		{
			printf("%s\t%-8d\t%d\t%d\t%d\n", Student[i].Name, Student[i].ID, Student[i].Math, Student[i].Chinese, Student[i].English);
			i++;
		}
	}
}
int Add()
{
	int i = 0;
	puts("Put ID");
	int ID;
	scanf("%d", &ID);
	while (Student[i].ID != 0&&Student[i].ID != -1)
	{
		if (Student[i].ID == ID)
		{
			return 1;
		}
		i++;
	}
	Student[i].ID = ID;
	puts("Name");
	scanf("%s", &Student[i].Name);
	puts("Math,Chinese,English");
	scanf("%d,%d,%d",&Student[i].Math, &Student[i].Chinese, &Student[i].English);
	return 0;
}
int Delete()
{
	int i = 0;
	puts("Put ID");
	int ID;
	scanf("%d", &ID);
	while (Student[i].ID != 0)
	{
		if (Student[i].ID == ID)
		{
			Student[i].ID = -1;
			break;
		}
		i++;
	}
	if (Student[i].ID == 0)
		return 1;
	return 0;
}
int Modify()
{
	int i = 0;
	puts("Put ID");
	int ID;
	scanf("%d", &ID);
	while (Student[i].ID != 0)
	{
		if (Student[i].ID == ID)
		{
			break;
		}
		i++;
	}
	if (Student[i].ID == 0)
		return 1;
	puts("Math,Chinese,English");
	scanf("%d,%d,%d", &Student[i].Math, &Student[i].Chinese, &Student[i].English);
	return 0;
}
int Find()
{
	int i = 0;
	puts("Put ID");
	int ID;
	scanf("%d", &ID);
	while (Student[i].ID != 0)
	{
		if (Student[i].ID == ID)
		{
			printf("%s,%d,%d,%d\n", Student[i].Name, Student[i].Math, Student[i].Chinese, Student[i].English);
			break;
		}
		i++;
	}
	if (Student[i].ID == 0)
		return 1;
	return 0;
}
int main(void)
{
	while (1)
	{
		Menu();
		char s = getchar();
		while (getchar() != ‘\n‘)continue;
		switch (s)
		{
		case ‘1‘: {Browse(); while (getchar() != ‘\n‘)continue; break; }
		case ‘2‘: {if (Add() == 1)puts("ID is duplicated"); else puts("Add success!"); while (getchar() != ‘\n‘)continue; break; }
		case ‘3‘: {if (Delete() == 1)puts("ID doesn‘t exist"); else puts("Delete success!"); while (getchar() != ‘\n‘)continue; break; }
		case ‘4‘: {if (Modify() == 1)puts("ID doesn‘t exist"); else puts("Modify success!"); while (getchar() != ‘\n‘)continue; break; }
		case ‘5‘: {if (Find() == 1)puts("ID doesn‘t exist"); else puts("Find success!"); while (getchar() != ‘\n‘)continue; break; }
		case ‘0‘: {return 0; }
		default: {puts("Please obey!"); while (getchar() != ‘\n‘)continue; break; }
		}
	}
	return 0;
}

简介:100个表示学生的结构体,有添加,浏览所有学生,根据学号查找、修改、删除的功能。具有自动学号查重的功能。

写这段代码收获;

1.if配合break跳循环很好用.

2.scanf里面要是用输入%s格式,如

scanf("%s", &Student[i].Name);

就不要用scanf接受多个格式的变量了,这个scanf就专门用来接%s,因为如果不这样做,输入的时候后面你想要输入的不属于%s格式的内容无法与前面你想输入进去属于%s的内容分开,造成你不想要的结果.

3.\t用于对齐时,如果一列上的数据,有的大于等于8位,有的小于8位就会造成对不齐的效果,这个时候机智的将小于8位的数利用类似-%8d这种格式强制将其转化成8位的就可以了.