fprintf man page on Ultrix

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printf(3int)							  printf(3int)

Name
       printf, fprintf, sprintf - print formatted output

Syntax
       #include <stdio.h>

       int printf ( format [, arg ] ...	 )
       char *format;

       int fprintf ( stream, format [, arg ] ...  )
       FILE *stream;
       char *format;

       int sprintf ( s, format [, arg ] ...  )
       char *s, *format;

Description
       The  international  functions and are similar to the standard I/O func‐
       tions. The difference is that the international functions allow you  to
       use  the	 %digit$  conversion character in place of the % character you
       use in the standard I/O functions. The digit is a decimal digit n  from
       1  to  9.   The	international  functions apply conversions to the n th
       argument in the argument list, rather than to the next unused argument.

       You can use the % conversion character in the international  functions.
       However,	 you  cannot  mix  the % conversion character with the %digit$
       conversion character in a single call.

       You can indicate a field width or precision by an asterisk (*)  instead
       of a digit string in format strings containing the % conversion charac‐
       ter. If you use an asterisk, you can supply an integer arg that	speci‐
       fies  the  field	 width	or precision. In format strings containing the
       %digit$ conversion character, you can indicate field width or precision
       by  the sequence *digit$.  You use a decimal digit from 1 to 9 to indi‐
       cate which argument contains an integer that specifies the field	 width
       or precision.

       The conversion characters and their meanings are identical to

       You must use each digit argument at least once.

       In  all cases, the radix character uses is defined by the last success‐
       ful call to category If category has not been called successfully or if
       the  radix  character  is  undefined, the radix character defaults to a
       period (.).

   International Environment
       LC_NUMERIC     If this environment is set and valid, uses the  interna‐
		      tional  language	database  named	 in  the definition to
		      determine radix character rules.

       LANG	      If this environment variable is set and valid  uses  the
		      international  language database named in the definition
		      to  determine  collation	and  character	classification
		      rules.   If  is  defined,	 its definition supercedes the
		      definition of LANG.

Examples
       The following example illustrates using an argument  to	specify	 field
       width:
       printf ("%1$d:%2$.*3$d:%4$.*3$d\n",
			   hour, min, precision, sec);
       The format string *3$ indicates that the third argument, which is named
       precision, contains the integer field width specification.

       To print the language independent date and time format use the  follow‐
       ing statement:
       printf (format, weekday, month, day, hour, min);
       For American use, format could be a pointer to the following string:
       "%1$s,  %2$s %3$d, %4$d:%5$.2d\n"
       This string gives the following date format:
       Sunday, July 3, 10:02
       For  use in a German environment, format could be a pointer to the fol‐
       lowing string:
       "%1$s, %3$d. %2$s, %4$d:%5$.2d\n"
       This string gives the following date format:
       Sonntag, 3. Juli, 10:02

Return Values
       and return zero for  success  and  EOF  for  failure.   The  subroutine
       returns its first argument for success and EOF for failure.

       In  the System V and POSIX environments, and return the number of char‐
       acters transmitted for success.	The function ignores the null termina‐
       tor  (\0) when calculating the number of characters transmitted.	 If an
       output error occurs, these routines return a negative value.

See Also
       intro(3int),   setlocale(3),   scanf(3int),    printf(3s),    putc(3s),
       scanf(3s), stdio(3s)
       Guide to Developing International Software

								  printf(3int)
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