单选题有以下程序#include main(){ FILE *fp; int a[10]={1,2,3,0,0},i; fp=fopen(d2.dat,wb); fwrite(a,sizeof(int),5,fp); fwrite(a,sizeof(int),5,fp); fclose(fp); fp=fopen(d2.dat,rb); fread(a,sizeof(int),10,fp); fclose(fp); for(i=0;i10;i++) printf(%d,,a[i]);}程序的运行结果是( )。A1,2,3,0,0,0,0,0,0,0,B1,2,3,1,2,3,0,0,0,0,C123,0,0,0,0,123,0,0,0,0,D1,2,3,0,0,1,2,3,0,0,
单选题
有以下程序#include main(){ FILE *fp; int a[10]={1,2,3,0,0},i; fp=fopen(d2.dat,wb); fwrite(a,sizeof(int),5,fp); fwrite(a,sizeof(int),5,fp); fclose(fp); fp=fopen(d2.dat,rb); fread(a,sizeof(int),10,fp); fclose(fp); for(i=0;i<10;i++) printf(%d,,a[i]);}程序的运行结果是( )。
A
1,2,3,0,0,0,0,0,0,0,
B
1,2,3,1,2,3,0,0,0,0,
C
123,0,0,0,0,123,0,0,0,0,
D
1,2,3,0,0,1,2,3,0,0,
参考解析
解析:
首先用函数fopen以“wb”的方式(wb只写打开或新建一个二进制文件,只允许写数据)打开文件d2.dat,然后调用两次fwrite函数将数组a的5个元素,依次输出到文件fp中,共10个字节,关闭文件。再次打开文件,使用文件指针指向文件的开头,调用fread函数从文件中读取这l0个字节的数据到数组a中。答案选择D选项。
首先用函数fopen以“wb”的方式(wb只写打开或新建一个二进制文件,只允许写数据)打开文件d2.dat,然后调用两次fwrite函数将数组a的5个元素,依次输出到文件fp中,共10个字节,关闭文件。再次打开文件,使用文件指针指向文件的开头,调用fread函数从文件中读取这l0个字节的数据到数组a中。答案选择D选项。
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