单选题有以下程序#include main(){ int i; FILE* fp; for (i=0; i5;i++) {  fp = fopen(output.txt, w);  fputc('K'+ i, fp);  fclose(fp); }}程序运行后,在当前目录下会生成一个output.txt文件,其内容是(  )。AEBEOFCABCDEDA

单选题
有以下程序#include main(){ int i; FILE* fp; for (i=0; i<5;i++) {  fp = fopen(output.txt, w);  fputc('K'+ i, fp);  fclose(fp); }}程序运行后,在当前目录下会生成一个output.txt文件,其内容是(  )。
A

E

B

EOF

C

ABCDE

D

A


参考解析

解析:
程序执行过程为:i=0时,以只写方式打开一个文本文件output.txt,调用函数fputc向文件输入A,关闭文件;i=1时,再次以只写方式打开output.txt,调用函数fputc向文件输入B覆盖原本的A,关闭文件;之后文件内的值依次为C、D、E,当i=4时,文件内为E,然后关闭文件;i=5退出循环。output.txt文件中内容为E。答案选择A选项。

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