若有以下程序 #include main() { FILE *fp; int i, a[6]={1,2,3,4,5,6},k; fp = fopen("data.dat", "w+"); for (i=0; i<6; i++) { fseek(fp, 0L, 0); fprintf(fp, "%d\n", a[i]); } rewind(fp); fscanf(fp, "%d", &k); fclose(fp); printf("%d\n", k); } 则程序的输出结果是