On Sunday, 24 July 2022 at 23:12:46 UTC, pascal111 wrote:
In the next code, we used "%s" format with receiving an integer value, while from C experience, we know that we use "%d" or "%i" formats, so what "%s" stands for here, I guess it's for receiving string data type?
The D things in std.stdio, writef and readf, use %s to just mean default for the given type. Since you passed it an int, the function knows it got an int (this is different than C, where the function only knows the format string so it requires you to get it right) and just automatically picks a default representation to scan.
You can writef("%s %s", "foo", 5); and it will see "foo" is a string and thus do it as a regular %s then see 5 is an int and since it knows, and you asked for just the default as-string representation, it will convert just like %d would.
