Inserting a newline near the end of a std::string [duplicate]

Question

I'm struggling with trying to implement a C++ code solution that will allow me to insert a newline (i.e. a string literal '\n') towards the end of a std::string, and not at the very end as most implementations show.

For example, I want to insert a '\n' just -1 characters before the very end itself. So if the string was 100 characters long (poor analogy I know), then I'd like to insert the string literal at the 99th character in a clean, easily readable manner.

Thanks!

Perhaps this std::string reference could be of help? It should at least tell that there's a function ti insert characters into a string at an arbitrary (but valid) position. — Some programmer dude
– Some programmer dude, Commented Aug 7, 2019 at 6:47

lubgr · Accepted Answer · 2019-08-07 06:50:03Z

3

Here's one way:

std::string test{"abcdef"}; if (!test.empty()) test.insert(test.length() - 1, "\n");

and here's one based on iterators:

if (!test.empty()) test.insert(std::prev(test.end()), '\n');

edited Aug 7, 2019 at 6:50

answered Aug 7, 2019 at 6:47

lubgr

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1 Comment

Phobos D'thorga Over a year ago

Thank you kindly, none of the examples were near that simple.

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