students_change.c

简易学生管理系统c语言版

/*******************************************************************************/
/*                     A  Simple Student Information System                    */
/*                            Copyright  From  QiJin                           */
/*******************************************************************************/


#include<stdio.h>
#include<stdlib.h>

/********************************************************************************/
#define MAX 100

struct stu_imfo{
	char name[14];  /*Student's Name*/
	char sex[8];    /*Student's Sex */
	char bir[12];   /*Student's Birthday*/
}student[MAX];

void init_list(void);
void enter(void);
void display(void);
void load(void);
void save(void);
int menu(void);
int isfree(void);

/**********************************************************************************/

int main(void)
{
	char choice;
	
	init_list(); /*Sub Function of Initial The Student Information Array */

	for(;;)
	{
		
		choice = menu();
		switch(choice)
		{
		case 1: enter();
			break;
		case 2: display();
			break;
		case 3: save();
			break;
		case 4: load();
			break;
		case 5: exit(0);
		}
	}
	return 0;
}

/********************************************************************************/

/* Sub Function of Initial The Student Information Array*/
void init_list(void)
{
	int t;
	for(t=0;t<MAX;++t)
		student[t].name[0] = '\0';
}

/*********************************************************************************/


/* Sub Function of Main Menu   ：） */
int menu(void)
{
	char s[80];
	int c;

	printf("********************************************\n");
	printf("***        Copyright from QiJin          ***\n");
	printf("********************************************\n");
	printf("********************************************\n");
	printf("******    Student Information System  ******\n");
	printf("******1. Enter a student's information******\n");
	printf("******2. Display student's information******\n");
	printf("******3. Save all the information     ******\n");
	printf("******4. Load the file                ******\n");
	printf("******5. EXIT                         ******\n");
	printf("********************************************\n");
	do
	{
		printf("\n Please enter your choice： ");
		gets(s);
		c = atoi(s);
	}while(c<0 || c>6);
	return c;
}

/*********************************************************************************/

/*Sub Function of Input the Student's detail Information */
void enter(void)
{
	int free;

	free = isfree();

	if(free == -1)
	{
		printf("\n Sorry！The RAM is FULL!");
		return;
	}
										/*Get the Information which The User Input*/
	printf("Please enter the Name： ");
	gets(student[free].name);

	printf("Please enter the Sex： ");
	gets(student[free].sex);

	printf("Please enter the Birthday： ");
	gets(student[free].bir);
}

/**********************************************************************************/

/*Sub Function of Search The free Student Information Array */
int isfree(void)
{
	int t;

	for(t=0;student[t].name[0] && t<MAX;++t);

	if(t==MAX)
		return -1; /*Never Find and then return -1*/
	return t;
}

/***********************************************************************************/

/*Sub Function of Display The Student's Information */
void display(void)
{
	int t;

	printf("<==Attention Please!You must save all the information before you exit!==>\n");
	printf("<==All the student's information in the RAM is: ==>\n");
	for(t=0;t<MAX;++t)
	{
		if(student[t].name[0])
		{
			
			printf("<==The name is：%s ==>\n",student[t].name);
			printf("<==The sex  is：%s ==>\n",student[t].sex);
			printf("<==Birthday is：%s ==>\n\n",student[t].bir);
		}
	}
	printf("\n\n");
}

/******************************************************************************************/

/*Sub Function of Save The Student's Information*/
/*Attention Please!This operation will recover the File!*/
void save(void)
{
	FILE *fp;
	int i;
	if((fp=fopen("stu_imfo","wb")) == NULL)
	{
		printf("Sorry!Can not open the file！！！ \n");
	return;
	}

	for(i=0;i<MAX;i++)  /*The Write Style is 'wb' */
		if(*student[i].name)
			if(fwrite(&student[i],sizeof(struct stu_imfo),1,fp)!=1)
				printf("Sorry！There is a error when the file be writed!  \n");
	printf("OK! Your operation is successful!  :)\n");
	printf("Go on your work and enjoy yourself! :P\n");
	printf("\n");
	fclose(fp);
}

/*****************************************************************************************/


/*Sub Function of Open the File*/
void load(void)
{
	FILE *fp;
	int i;

	if((fp=fopen("stu_imfo","rb"))==NULL)
	{
		printf("Sorry!Can not open the file！ \n");
		return;
	}

	init_list();
	for(i=0;i<MAX;i++)
		if(fread(&student[i],sizeof(struct stu_imfo),1,fp)!=1)   
		{
			if(feof(fp)) break;
			printf("Sorry!Can not read the file！ \n");
		}
	
	fclose(fp);
	printf("OK!You have opened the File which name is stu_imfo . :)\n");
	printf("The whole information in the file is: \n");
	for(i=0;i<MAX;++i)   /*Read the date and Display them*/
	{
		if(student[i].name[0])
		{
			
			printf("<==The name is：%s ==>\n",student[i].name);
			printf("<==the sex  is：%s ==>\n",student[i].sex);
			printf("<==Birthday is：%s ==>\n\n",student[i].bir);
		}
	}

}