#include <stdio.h>
#include <stdlib.h>
void main ()
{
    FILE *fp;
    char ch1[5];
    char ch2[5];
    char ch3[5];
    int a,b;
    if((fp=fopen("Student.txt","r"))==NULL)
    {
        printf("Cannot open file strike any key exit!");
        getchar();
        exit(1);
    }
   
    while(!feof(fp))
    {
        fscanf(fp,"%d%s%s%d%s",&a,ch1,ch2,&b,ch3);
        printf("%5d%s%s%5d%s",a,ch1,ch2,b,ch3);
    }
   
    fclose(fp);
}//运行的是乱码，哪里出错了，求解

文件里的内容是什么

我没猜错的话 楼主想用空格作为分界，这样当然不行了。只有先读出来一条，在解析。可以试试stream

if((fp1=fopen("Sc.txt","r"))==NULL)
    {
        printf("can't open the Sc.txt file\n");
        getchar();
        exit(1);
    }
        while(p)
        {
            while(!feof(fp1))
            {
                if(m++==1)
                    fscanf(fp1,"%s%s%s",ch1,ch2,ch3);
                else
                {
                    fscanf(fp1,"%d%d%d",&a,&b,&c);
                    printf("%5d%5d%5d\n",a,b,c);
                    if(p->Sno==a)
                    {
                        p->Cno[i++]=b;
                        p->Grade[j++]=c;
                        printf("%5d%5d\n",p->Cno[i-1],p->Grade[i-1]);
                    }
                }
            }
                        rewind(fp1);//重新到文件的开头
            p=p->next;
            i=j=0;
        }
p是链表的头指针，执行第二次的外循环输出来文件的就是乱码。文件就是关于成绩学号什么的

把文件打包发上来我帮你看看  没有文件没法测试代码

#include <stdio.h>
#include <string.h>
#include <malloc.h>

int main ()
{
    FILE *fp;
    char ch1[9]={'\0'};
    char ch2[11]={'\0'};
    char ch3[11]={'\0'};
    char ch4[11]={'\0'};
    char ch5[12]={'\0'};
    if((fp=fopen("Student.txt","rb"))==NULL)
    {
        printf("Cannot open file strike any key exit!");
        return 0;
    }
    fseek (fp ,0, SEEK_END); 
    int lsize = ftell (fp); 
    fseek (fp ,0, SEEK_SET); 
    char * rbuf = (char*) malloc (sizeof(char)*lsize+1); 
    memset(rbuf,'\0',lsize+1);
    fread(rbuf,1,lsize,fp);
    int i=0;
    while(1)
    {
        strncpy(ch1,rbuf+i,8);
        i+=8;
        strncpy(ch2,rbuf+i,10);
        i+=10;
        strncpy(ch3,rbuf+i,10);
        i+=10;
        strncpy(ch4,rbuf+i,10);
        i+=10;
        strncpy(ch5,rbuf+i,11);
        i+=11;
        printf("%8s%10s%10s%10s%11s",ch1,ch2,ch3,ch4,ch5);
        memset(ch1,'\0',9);
        memset(ch2,'\0',11);
        memset(ch3,'\0',11);
        memset(ch4,'\0',11);
        memset(ch5,'\0',12);
        if(i>lsize) break;
    }
    free(rbuf);
    fclose(fp);
    return 0;
}

[ 本帖最后由 wp231957 于 2014-3-1 18:13 编辑 ]

改动这么大，以解决，谢了

#include <stdio.h>
#include <string.h>

int main()
{
    FILE* fp = fopen( "Student.txt", "r" );
    if( !fp )
    {
        printf( "%s\n", "Cannot open the file." );
        return 1;
    }

    { // table header
       

        for( char buf[260]; fgets(buf,sizeof(buf)/sizeof(buf[0]),fp); )
        {
            printf( "%s", buf );

            if( buf[strlen(buf)-1] == '\n' )
                break;
        }
    }

    { // table content
        int  Sno;
        char Sname[13];
        char Ssex[3];
        int  Sage;
        char Sdept[3];

        while( fscanf(fp,"%d%s%s%d%s",&Sno,Sname,Ssex,&Sage,Sdept) == 5 )
            printf( "%d\t%s\t%s\t%d\t%s\n", Sno,Sname,Ssex,Sage,Sdept );
    }

    fclose(fp);
    return 0;
}