有以下程序#include 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");fp=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( )。