有以下程序：#include＜stdio.h＞main(){FILE*fp;int a[10]={1,2,3},i,n；fp=fopen("d1.dat","w");for(i=0;i＜3;i++)fprintf(fp,"%d",a[i])；fprintf(fp,"\n")；fclose(fp)；fp=fopen("d1.dat","r");fscanf(fp,"%d",＆n)；fclose(fp)；printf("%d\n",n)；程序的运行结果是______。