有以下程序#includemain(){inti;FILE*fp;for(i=0;i<3;i++){fp=fopen("res.txt","w");fputc('K'+i,fp);fclose(fp);}}程序运行后,在当前目录下会生成一个res.txt文件,其内容是
A. EOF
B. M
C. KLM
D. L
有以下程序#includemain(){FILE*fp;inti,a[6]={1,2,3,4,5,6},k;fp=fopen("data.dat","w+");fprintf(fp,"%d\n",a[0]);for(i=1;i<6;i++){rewind(fp);fprintf(fp,"%d\n",a[i]);}rewind(fp);fscanf(fp,"%d",&k);fclose(fp);printf("%d\n",k);}程序运行后的输出结果是
A. 6
B. 21
C. 123456
D. 654321