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vprintf() Write Formatted Data to Stdout
#include <stdio.h>
#include <stdarg.h> Use for ANSI C standard compatibility
int vprintf(format-string,arg-ptr);
const char *format-string; Format control
va_list arg-ptr; Pointer to list of arguments
vprintf() formats and prints a series of characters and values to the
standard output stream 'stdout'. It is similar to printf(), but
accepts a pointer to a list of arguments rather than a list of
arguments.
'arg-ptr' has the type 'va_list'. It is defined in <stdarg.h>
(required for compatibility with proposed ANSI C standard).
'arg-ptr' points to a list of arguments. These arguments are
converted and output according to specifications in 'format-string'.
(For the inner workings of variable-length parameter lists, see
va_start(), va_arg(), and va_end()).
See printf() for a complete description of 'format-string'.
-------------------------------- Example ---------------------------------
The following statements write data to the console.
#include <stdio.h>
#include <stdarg.h>
int x;
main()
{
char *date = "12/21/86";
char *header = "ANNUAL REPORT";
putdata("Data from : %s, (%s)\n",header,date);
for (x = 0; x < 100; x++)
putdata("%d",x);
putdata("\nEnd of Report\n");
}
putdata(fmt_str)
char *fmt_str;
{
va_list arg_ptr;
va_start(arg_ptr,fmt_str);
vprintf(fmt_str,arg_ptr);
va_end(arg_ptr);
}
See Also:
printf()
va_arg()
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