如何从一个fstream txt文件中跳过C ++中的整数？ [英] How to skip integers in C++ taken from a fstream txt file?

问题描述

我需要创建一个使用循环的函数。此函数将打开一个文本文件，然后必须能够跳过可变数量的前导随机整数。程序必须能够处理任意数量的前导随机整数。

I need to create a function that uses a loop. This function will open a text file and then must be able to skip a variable number of leading random integers. The program must be able to handle any number of leading random integers.

示例如果打开的文件在第一行读取：

Example if the opened file reads this on its first line:

100 120 92 82 38 49 102

并且 SKIP_NUMBER 变量已分配3，函数将抓取的数字为82.

and the SKIP_NUMBER variable is assigned 3 the number the function would grab is 82.

函数必须继续获取每个 SKIP_NUMBER 的整数，直到它到达文件的结尾。这些从txt文件中获取的整数然后被放置到另一个文本文件中。

The function must continue to grab the integers every SKIP_NUMBER until it reaches the end of the file. These integers taken from the txt file are then placed into another text file.

请帮助我真的迷失在如何创建这个循环！ ：D

Please help I'm really lost on how to create this loop! :D

这里是我的函数到目前为止...

Here is my function so far...

//Function skips variables and returns needed integer
int skipVariable (int SKIP_NUMBER)
{

return 0; //temporary return
}

这些是我的程序变量：

// initialize function/variables

ifstream fin;
string IN_FILE_NAME, OUT_FILE_NAME;
int SKIP_NUMBER;

推荐答案

如果我是你，

If I were you, I would approach this problem like this:

1. create ifstream object m_strm
2. open the file
3. whie (m_strm.good())
    (a.) use ifstream's getline() to read a line from the file
    (b.) use strtok() function to tokenize the string (for whitespaces)
    (c.) maintain a counter when you keep getting tokens
    (d.) Now you can skip whenever you like.
4. Done with file, so close the stream!

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