单项选择题

有下列程序： #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=open("d1.dat","r"); fscanf(fp,"%d",&n); fclose(fp); prinff("%d\n",n); 程序的运行结果是( )。

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