C向文件写入数据时会覆盖原有数据，请教高手指点
#include <stdio.h>
#include <STDLIB.H>
typedef struct
{
int sno;
char name[20];
float money;
}student;
int main()
{
FILE *p;
if((p=fopen("D:/1.txt","w"))==NULL)
printf("File open error!");
else
{
printf("input your information:");
student *t,A;
t=&A;
scanf("%d",&t->sno);
scanf("%s",t->name);
scanf("%f",&t->money);
fseek(p,0L,SEEK_END);
fprintf(p,"\n%d %s %f",t->sno,t->name,t->money);
}
return 0;
}
C向文件写入数据时会覆盖原有数据，请教高手指点
[解决办法]
if((p=fopen("D:/1.txt","a"))==NULL)
