有以下程序

#include <stdio.h>

main()

{ FILE *fp; int i=20,j=30,k,n;

fp=fopen("d1.dat","w");

fprintf(fp,"%d/n",i);fprintf(fp,"%d/n",j);

fclose(fp);

fp=fopen("d1.dat","r");

fscanf(fp,"%d%d",&k,&n); printf("%d %d/n",k,n);

fclose(fp); }

程序运行后的输出结果是

A．20 30

B．20 50

C．30 50

D．30 20

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