#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"dazuoye.h"
void readFile()
{
    int n;
    struct stuMessage *head ,*temp;
    FILE *inFile;

   
    inFile = fopen("stuImformation.txt","r");
   
    if(inFile == NULL)
    {
        printf("文件打开失败，请检查文件是否存在");
        exit(1);
    }
    else
    {
        while(fscanf(inFile,"%s %s %s\n",head->name,head->idnum,head->Clanum)!=EOF)
        {
            head->nextaddr = NULL;

            if(firstaddr==NULL)
            {
                firstaddr=head;
                temp=head;
            }
            else
            {
                temp->nextaddr=head;
                temp=head;
            }
            head=(struct stuMessage *)malloc(sizeof(struct stuMessage *));
        }
    }
   
    fclose(inFile);
}
void saveFile()
{
    struct stuMessage *temp;
    FILE *outFile;
    int n;
    outFile=fopen("stuImformation.txt","w");

    if(outFile==NULL)
    {
        printf("文件打开失败！");
        exit(1);
    }

    while(firstaddr!=NULL)
    {
        temp=firstaddr;
        firstaddr=firstaddr->nextaddr;
        fprintf(outFile,"%s %s %s",temp->name,temp->idnum,temp->Clanum);
        for(n=0;n<10;n++)
        {
            fprintf(outFile,"%f",temp->grade[n]);
            free(temp);
        }
        fprintf(outFile,"\n",0);
    }
    fclose(outFile);
}

你好地检查文件名是否一样，信息是：information

看看你的txt文件是否和.c文件放一起了