3.6f in an histogram example

Newbie
1

In the following snippet from an example of histogram random data filling, a value is mentioned as 3.6f, what does this mean?

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2

In c++ a floating point literal is a double. So writing auto mean_count = 3.6; would make mean_count a double. Using the floating point literal suffix f (or F) turns the literal (and thus mean_count) into a float.