作业帮fstream file("book.txt",ios::in);fstream file("book.txt",ios::
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fstream file("book.txt",ios::in);fstream file("book.txt",ios::
fstream file("book.txt",ios::in);fstream file("book.txt",ios::
fstream file("book.txt",ios::in);fstream file("book.txt",ios::
fstream file("book.txt",ios::in) 以输入流的方式创建文件类型变量file 输入流
fstream file("book.txt",ios::out);以输出的方式创建文件类型file 输出流
ios::app：以追加的方式打开文件
ios::ate：文件打开后定位到文件尾,ios:app就包含有此属性
ios::binary：以二进制方式打开文件,缺省的方式是文本方式.两种方式的区别见前文
ios::in：文件以输入方式打开
ios::out：文件以输出方式打开
ios::nocreate：不建立文件,所以文件不存在时打开失败
ios::noreplace：不覆盖文件,所以保存文件时如果文件存在失败
ios::trunc：如果文件存在,把文件长度设为0
可以用“或”把以上属性连接起来,如ios::out|ios::binary
fstream file(book.txt,ios::in);fstream file(book.txt,ios::
fstream file(E:
eader.txt,ios::in);什么意思
File can't be found!
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