Dynamically Create A Printf String Format
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Formatting a string with Printf
requires defining a format for that string.
The format is the first argument. At compile-time it is interpreted as a format6
type value.
So, what if you want a dynamically created format value? Simply concatenating some strings together won't do it because then the type will be string
and that's not going to compile.
The function can help.
We can convert our string that has the appearance of a format into an actual format6
type. To do this, we have to tell format_from_string
what types each of the formats is going to have -- hence the second argument %s
.