从C字符串中删除多余的空白？ [英] Remove extra white space from inside a C string?

问题描述

我已阅读文本的几行到C-字符串数组。该行有标签或空格分隔栏的任意数，我试图找出如何删除它们之间的所有多余的空格。最终的目标是使用的strtok分手列。这是列的一个很好的例子：

I have read a few lines of text into an array of C-strings. The lines have an arbitrary number of tab or space-delimited columns, and I am trying to figure out how to remove all the extra whitespace between them. The end goal is to use strtok to break up the columns. This is a good example of the columns:

Cartwright   Wendy    93
Williamson   Mark     81
Thompson     Mark     100
Anderson     John     76
Turner       Dennis   56

我怎样才能消除所有，但列，以便输出看起来像这样的空格或选项卡之一？

How can I eliminate all but one of the spaces or tabs between the columns so the output looks like this?

Cartwright Wendy 93

另外，可我只是一个不同的字符全部替换列之间的空白，以使用strtok的？像这样的事情？

Alternatively, can I just replace all of the whitespace between the columns with a different character in order to use strtok? Something like this?

Cartwright#Wendy#93

修改多伟大的答案，但必须选择一个。感谢您的帮助所有。

edit: Multiple great answers, but had to pick one. Thanks for the help all.

推荐答案

如果可能我的声音你这样做是错误的的意见，为什么不只是消除了空白，而读？使用的fscanf（％S，字符串）; 来读一个字（无空格），然后读取空白。如果它是空格或制表符，请继续阅读到一个数据线。如果它是一个新行，开始新的条目。这是在C最容易尽快将数据进入你能处理的格式，而不是试图做重型文本操作。

If I may voice the "you're doing it wrong" opinion, why not just eliminate the whitespace while reading? Use fscanf("%s", string); to read a "word" (non whitespace), then read the whitespace. If it's spaces or tabs, keep reading into one "line" of data. If it's a newline, start a new entry. It's probably easiest in C to get the data into a format you can work with as soon as possible, rather than trying to do heavy-duty text manipulation.

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