#include<stdio.h>
#include<stdlib.h>
struct student
{
    int num;
    char name[10];
    float score[3];
    float aver;
}stu[5];
int main(void)
{
    FILE *fp;
    char filename[20];
    int i,j;
    float sum;
    for(i=0;i<5;i++)
    {
        sum=0;
        printf("\ninput score of student %d\n",i+1);
        printf("NO: ");
        scanf("%d",&stu[i].num);
        printf("name:");
        scanf("%s",stu[i].name);
        for(j=0;j<3;j++)
        {
            printf("score %d:",j+1);
            scanf("%f",&stu[i].score[j]);
            sum=sum+stu[i].score[j];
        }
        stu[i].aver=sum/3;
    }
    puts("please input the filename:");
    scanf("%s",filename);
    if((fp=fopen(filename,"w"))==NULL)
    {
        printf("file can not open\n!");
        exit(0);
    }
    for(i=0;i<5;i++)
    {
        if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)//fprintf(fp,"%d %s %f %f %f %f",stu[i].num,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].aver);
        {
            printf("file write error!\n");
        }
    }
    fclose(fp);
    fp=fopen(filename,"r");
    for(i=0;i<5;i++)
    {
        fread(&stu[i],sizeof(struct student),1,fp);//fcanf(fp,"%d %s %f %f %f %f",stu[i].num,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].aver);
        printf("\n%d ,%s, %.2f, %.2f, %.2f, %.2f\n",stu[i].num,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].aver);
    }
    fclose(fp);
    return 0;


}

用fwite和fread的时候，能够正确的在屏幕上显示出来，在文件中是乱码，我想让在文件中不是乱码，就用了fprintf  fscanf 但是老不成功啊，不知道咋回事，我的代码如上，希望高手给予指教