有以下程序:
#include<stdio.h>
main()
FTLE*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______。
A) 12300
B) 123
C) 1
D) 321