Here is description of the printf function in Cosmic:

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printf

Description
Output formatted arguments to stdout

Syntax
#include
int printf(@near char *fmt, ...)

Function
printf writes formatted output to the output stream using the format
string at fmt and the arguments specified by ..., as described below.

printf uses putchar to output each character.

Format Specifiers
The format string at fmt consists of literal text to be output, interspersed
with conversion specifications that determine how the arguments are to
be interpreted and how they are to be converted for output. If there are
insufficient arguments for the format, the results are undefined. If the
format is exhausted while arguments remain, the excess arguments are
evaluated but otherwise ignored. printf returns when the end of the format
string is encountered.

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Return Value
printf returns the number of characters transmitted, or a negative
number if a write error occurs.

Notes
A call with more conversion specifiers than argument variables will
cause unpredictable results.

Example
To print arg, which is a double with the value 5100.53:
printf(“%8.2f\n”, arg);
printf(“%*.*f\n”, 8, 2, arg);

both forms will output: 05100.53

Notes
If printf encounters an invalid conversion specifier, the invalid specifier
is ignored and no special message is generated.

See Also
sprintf

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Is there any such description in Raisonance help file ??