如何复制文本文件中的C或C ++？ [英] How to copy text file in C or C++?

问题描述

当尝试一个文本文件复制到另一个文件B，有可能有几种方法：
1）逐字节
2）一字一句
3）一行行

When trying to copy a text file A to another file B, there may have several methods: 1) byte by byte 2) word by word 3) line by line

哪一个更有效？

推荐答案

使用缓冲区：

#include <fstream>

int main()
{
    std::ifstream    inFile("In.txt");
    std::ofstream    outFile("Out.txt");

    outFile << inFile.rdbuf();
} 

C ++的fstreams内部缓冲。他们使用一个有效的缓冲区大小（不管什么人说流:-)效率。所以，只是一个流缓冲区复制到流哎preSTO内部魔术会做一个流的有效复制到其他。

The C++ fstreams are buffered internally. They use an efficient buffer size (despite what people say about the efficiency of stream :-). So just copy one stream buffer to a stream and hey presto the internal magic will do an efficient copy of one stream to the other.

但学习做成炭使用std ::复制（CHAR）是这么多的乐趣。

But learning to do it char by char using std::copy() is so much more fun.

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