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______。