单选题有以下程序:#include main(){ FILE *fp; int i,a[6]={1,2,3,4,5,6},k; fp=fopen(data.dat,w+b); fprintf(fp,%d,a[0]); for(i = 1;i 6;i++) {  fseek(fp,0L,0);  fscanf(fp,%d,k);  fseek(fp,0L,0);  fprintf(fp,%d,a[i]+=k); } rewind(fp); fscanf(fp,%d,k); fclose(fp); printf(%d,k);}程序的运行结果是(  )。A21B6C123456D11

单选题
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+b); fprintf(fp,%d,a[0]); for(i = 1;i < 6;i++) {  fseek(fp,0L,0);  fscanf(fp,%d,&k);  fseek(fp,0L,0);  fprintf(fp,%d,a[i]+=k); } rewind(fp); fscanf(fp,%d,&k); fclose(fp); printf(%d,k);}程序的运行结果是(  )。
A

21

B

6

C

123456

D

11


参考解析

解析:
程序执行过程为:以读/写方式建立一个新的文本文件data.dat,将l写入文件;执行for循环,将文件指针移到文件开头,将文件第一个数值1赋给k,再将指针移动到开头,向文件内输入a[i]+k=3。for循环实现将a数组中元素累加,结果21存放在文件中。调用rewind将文件指针移动到开头,调用fscanf函数从文件中读出数值赋予k=21,调用fclose函数关闭文件,打印k值。答案选择A选项。

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