file.c

一个学生信息管理系统

#include <stdio.h>
#include <stdlib.h>
//#include <io.h>
#include <conio.h>

struct student_mark  //学生成绩信息
{ int number;
   int semester;
   char subject[5][20];
   int n;
   float mark[5];
};

struct student     //学生基本信息
{	char name[50];
	char sex;
	int number;
	char class_code[50];
	char district[50];
	char address[100];
};
void main()
{		
	int fp;	
	int i;
	struct student stud[5];
	char tmpstr[100];
	if((fp=fopen("data_list","wb"))==NULL) //创建文件data_list
		{
			printf("cannot open file\n");
			exit(0);
		}
	for(i=0;i<5;i++)  //写文件
    {	 
		stud[i].number=i;
		strcpy(stud[i].name,"张");
		itoa(i,tmpstr,10);
		strcat(stud[i].name,tmpstr);
		if(fwrite(&stud[i],sizeof(struct student),1,fp)!=1)
		{
			printf("file write error\n");
			return;
		}
	}
	fclose(fp); //关闭文件

	if((fp=fopen("data_list","rb"))==NULL) //打开文件data_list
		{
			printf("cannot open file\n");
			exit(0);
		}

	for(i=0;i<5;i++)  //读文件
	{
		if(fread(&stud[i],sizeof(struct student),1,fp)!=1) //打开文件
		 {
			printf("file read error\n");
			return;  
		}
		else 
			printf("%d:%s\n",i,stud[i].name); //显示读出的信息
	}
	
	fclose(fp);
}