Single vs. double quotes (C++ / PS)

C++

char c = 'a'; // Character
char* s = "abc\ndef"; // Null-terminated C-string

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PS

> $a = 42
> Write-Output ('The answer is ... ' + $a) # Verbatim string
The answer is ... 42
> Write-Output "The answer is`n... $a" # Expandable string
The answer is
... 42