有以下程序

#include <stdio.h>

main ( )

{ FILE *fp; int i,a[6]={1,2,3,4,5,6};

fp=fopen("d3.dat", " w+b");

fwrite(a,sizeof(int),6,fp);

fseek(fp,sizeof(int)*3,SEEK_SET); /* 该语句使读文件的位置指针从文件头向后移动 3 个 int 型数据 */

fread(a,sizeof(int),3,fp); fclose(fp);

for(i=0;i<6;i++) printf("%d,",a[i]);

}

程序运行后的输出结果是

A)4,5,6,4,5,6,

B)1,2,3,4,5,6,

C)4,5,6,1,2,3,

D)6,5,4,3,2,1,