Printf can be implemented by using __________ list.
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Answer / sagar arora
variable length argument lists,for more information checked
out in Dennis Ritchie book.u can write ur own printf.
Is This Answer Correct ? | 6 Yes | 1 No |
Answer / navneet
using Variable length argument lists :
Let us see how
Use vprintf, vfprintf, or vsprintf.
Here is an "error" routine which prints an error message, preceded by the string "error: " and terminated with a newline:
#include <stdio.h>
#include <stdarg.h>
void
error(char *fmt, ...)
{
va_list argp;
fprintf(stderr, "error: ");
va_start(argp, fmt);
vfprintf(stderr, fmt, argp);
va_end(argp);
fprintf(stderr, "\n");
}
To use the older <varargs.h> package, instead of <stdarg.h>, change the function header to:
void error(va_alist)
va_dcl
{
char *fmt;
change the va_start line to
va_start(argp);
and add the line
fmt = va_arg(argp, char *);
between the calls to va_start and vfprintf. (Note that there is no semicolon after va_dcl.)
References: K&R II Sec. 8.3 p. 174, Sec. B1.2 p. 245; H&S Sec. 17.12 p. 337; ANSI Secs. 4.9.6.7, 4.9.6.8, 4.9.6.9 .
Is This Answer Correct ? | 1 Yes | 0 No |
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what is variable length argument list?
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