有以下程序 #include ＜stdio.h＞ main() FILE
题型：单项选择题
问题：
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");
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
A．20 30
B．20 50
C．30 50
D．3020
