单项选择题

有以下程序:
#include ＜stdlo.h＞
main( )
FILE * fp; int i,k,n;
fp = fopen( "data. dat" ,"w +" )
for(i = 1 ;i＜6;i ++ )
fprintf(fp."% d",i);
if(i%3 ==0)fprintf(fp," \n");

rewind(fp);
fscanf(fp." % d% d" ,&k, &n) ;printf(" % d%d \n" ,k,n);
fclose(fp);