Print formatted string with variables

Question

Im going through a book in Scheme that has me using the writeln function. It expects me to be able to give it a series of strings and variables that it will then output to the console like so. (writeln "the number is " 4 "!") with the expected output being the number is 4!.

However when running and looking up documentation writeln and similar functions like display only take two arguments the data and an output. Giveing writeln multipule arguments like "the number is ", 4 and "!" will cause an error.

How does one print the formatted string like the book is expecting?

I have tried... Quoting the expression giving to writeln. trying alternative functions like display.

Which Scheme version is your book using? I/O is very version-specific. (And Racket is not Scheme.) — molbdnilo, Feb 16 '23 at 19:43

score -2 · Accepted Answer · answered Feb 17 '23 at 23:49

-2

The printf function solves this

answered Feb 17 '23 at 23:49

FiveSeven

23
5

There is not `printf` procdure descrbed in the language specification. That is any of the RnRS documents. You are answering for a DIFFERENT language. – Sylwester Feb 23 '23 at 23:59

Print formatted string with variables

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