为什么我想输出一个整数一个结构体内容就是会失去一部分没有输出，怎么办

#include"stdio.h"
struct student
{
char rcord[10];
char name[10];
char phone[12];
char qq[20];
}stu={"11","22","33","44"},stu1;
int main()
{
int num=2,a;
FILE *fp,*fp1;
fp=fopen("c://p.txt","wb");
fprintf(fp,"%d\t",num);
fwrite(&stu,sizeof(stu),1,fp);
rewind(fp);
fclose(fp);

fp1=fopen("c://p.txt","rb");
fscanf(fp1,"%d",&a);
fread(&stu1,sizeof(stu),1,fp1);
fclose(fp1);
printf("%d\t%s\t%s\t%s\t%s\n",a,stu1.rcord,stu1.name,stu1.phone,stu1.qq);

}