How to Print a Comma-Separated List in C Without a Trailing Comma?

Printing Elements in a Comma-Separated List

Printing a list of elements with commas in C requires a different approach compared to other languages. Here's how you can achieve this:

The difficulty in C lies in avoiding a trailing comma. In your provided code, inserting a block to add commas would introduce an additional comma at the end, which you want to avoid.

To resolve this, you can leverage an infix_iterator. Unlike a traditional output stream iterator, an infix iterator inserts a delimiter between elements, allowing you to avoid the trailing comma issue.

Using the infix_iterator:

First, include the infix_iterator.h header:

#include "infix_iterator.h"

Next, create an infix iterator and specify the delimiter you want to use (in this case, a comma):

infix_ostream_iterator<string> out_iterator(out, ",");

Finally, use the infix iterator to copy the elements from your keywords container into the output stream:

std::copy(keywords.begin(), keywords.end(), out_iterator);

This will print the elements in keywords with commas in between, and no trailing comma.

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