01-23-2014
You give printf and scanf identical command strings, but %* means something very different to printf and scanf. It means "print this type to [format] characters wide" in printf, and "don't store this value" in scanf.
Also, you are giving printf all the same arguments too. scanf needs &i because scanf needs i's location, not its contents -- but printf needs its contents, not its location!
So, my best guess at what happened is that printf's %d prints part of a memory address (since you are on a 64-bit system, and %d expects a 32-bit integer). Next, %*s tries to get a width, and gets the other half of that memory address -- a very, very high number! So it prints several billion leading spaces before it actually gets to the string.
Last edited by Corona688; 01-23-2014 at 02:15 PM..
This User Gave Thanks to Corona688 For This Post:
10 More Discussions You Might Find Interesting
1. Programming
What is the output of the following program considering an x86 based parameter passing sequence where stack grows towards lower memory addresses and that arguments are evaluated from right to left:
int i=10;
int f1()
{
static int i = 15;
printf("f1:%d ", i);
return i--;
}
main()
{... (2 Replies)
Discussion started by: arunviswanath
2 Replies
2. Shell Programming and Scripting
How to print output in following format?
A..................ok
AA................ok
AAA..............ok
AAAAAA........ok
"ok" one under one (4 Replies)
Discussion started by: mirusnet
4 Replies
3. UNIX for Dummies Questions & Answers
Hi,
I have just completed my first script (:D) and now i just need to format it with printf.
This is what I have:
#!/bin/ksh
TOTB=0
TOTF=0
TOTI=0
HOST=`hostname`
echo " FSYSTEM BLKS FREE INUSE MOUNTEDON"
df -m | grep -v ":"|grep -v Free|grep -v "/proc"| while read FSYSTEM... (2 Replies)
Discussion started by: compan023
2 Replies
4. Shell Programming and Scripting
Target file contains short text (never more than 1 line) and filenames.
The format is, e.g.,:
TEXT1
filename1
TEXT2
TEXT3
filename3dddd
filename3dddd
TEXT4
filename4
TEXT5
filename5dddd
filename5dddd
filename5
where dddd is a random 4-digit whole number.
Desired output: (4 Replies)
Discussion started by: uiop44
4 Replies
5. UNIX for Dummies Questions & Answers
I have this command like that has %s in it, I know %s calls a column, but I am not sure I understand which column (I mean for my case I can check the input file, but I want to know how is this %s used, how comes tha same symbo; gives different columns in one command line:
{printf "grep %s... (22 Replies)
Discussion started by: cosmologist
22 Replies
6. Shell Programming and Scripting
I am having a major problem with printf, The more I pad it, the less I see :(
The problem is in the first function, report
Am I ruining output somewhere? I wont print out the names propely, it cuts them off or deletes them completely :(
#!/bin/bash
report()
{
printf "%-10s" STUD# ... (2 Replies)
Discussion started by: L0ckz0r
2 Replies
7. Programming
When I compile this i get the following error
"error: expected declaration specifiers or '...' before syslog"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define __LIBRARY__
#include <linux/unistd.h>
/* define the system call, to override the library... (6 Replies)
Discussion started by: dragonpoint
6 Replies
8. Shell Programming and Scripting
Hi,
I a sequance number from 1-999 and i want asing the value like 001,002..999
Exp:
file_001
file_002
file_003...
file_999
How can i disaplay the sequnace number as mention above. (3 Replies)
Discussion started by: koti_rama
3 Replies
9. Shell Programming and Scripting
I have searched and the answers I have found thus far have led me to this point, so I feel I am just about there.
I am trying to convert a column of hexadecimal to decimal values so that I can filter out via grep just the data I want. I was able to pull my original 3 character hex value and... (10 Replies)
Discussion started by: PCGameGuy
10 Replies
10. Shell Programming and Scripting
hi all,
I had my script as
a=qw
b=rter
c=fdfd
curency=1000
printf"${curency} $a $b $c" > filename
can i have printf statement that can change the currency from 1000 to 1,000 like it should convert the number to currency format ..?(i.e for any number) (14 Replies)
Discussion started by: hemanthsaikumar
14 Replies
LEARN ABOUT DEBIAN
dirfile2ascii
dirfile2ascii(1) GETDATA dirfile2ascii(1)
NAME
dirfile2ascii -- output dirfile database vectors as ASCII text
SYNOPSIS
dirfile2ascii [ OPTION ]... DIRFILE
[ [ -a | -A | -e | -E | -F | -g | -G | -o | -i | -u | -x | -X ] FIELD ]...
DESCRIPTION
Fetches data from a dirfile(5) database specified by DIRFILE and writes it as ASCII to standard output. Any number of vector FIELDs may be
specified. Each specified field is printed in a separate column.
Mandatory arguments to long options are mandatory for short options too.
-d, --delimeter=delim
separate columns by delim. (Default: a single space.)
-f, --first-frame=first_frame-last_frame
read from frame first_frame to frame last_frame (inclusive).
-f, --first-frame=first_frame:nframes
equivalent to --first-frame=first_frame --num-frames=nframes.
-f, --first-frame=first_frame
If first_frame >= 0, start reading at frame first_frame. If first_frame is -1 and --num-frames=nframes is specified, read the last
nframes frames. If --first-frame is not specified, reading starts at frame zero.
-n, --num-frames=nframes
read at most nframes frames. If not specified, or if nframes = 0, all frames to the end-of-field are read.
-p, --precision=format
use format to format output. format may contain any of the flag characters, a field width, and/or a precision as specified in
printf(3). It may not contain a length modifier.
-q, --quiet
don't write diagnostic messages on standard error. (This is the default behaviour).
-s, --skip=frame_skip
if frame_skip > 0, output only one sample for every frame_skip frames.
-v, --verbose
write diagnostic messages on standard error.
-z, --fill=STRING
Fill columns which go past the end of their corresponding field with the string STRING. The default behaviour is to fill columns
with floating-point conversions with NaN and columns with integer conversion with 0, which mirrors what occurs when an attempt is
made to print data from before the start of a field. (Note: the default behaviour cannot be reproduced with this option, since
STRING is applied to all columns, regardless of conversion type.)
In addition to the above, each FIELD argument may be preceded by a short option, one of: -a, -A, -e, -E, -F, -g, -G, -i, -o, -u, -x, -X,
indicating the conversion to be used. See printf(3) for the meaning of these conversion specifiers. The output flags, width, and preci-
sion may be specified by using --precision. If no conversion specifier is given, %f is used.
For conversion specifiers %a, %A, %e, %E, %f, %F, %g, %G, data is read from the dirfile as double precision floats. For conversion speci-
fier %i, data is read as 64-bit signed integers. For conversion specifiers %o, %u, %x, %X, data is read as 64-bit unsigned integers.
LIMITATIONS
No native support for printing complex data is provided. This may be worked around by using dirfile(5) representation suffixes. For exam-
ple, the command
$ dirfile2ascii DIRFILE FIELD.r FIELD.i
will print the real and imaginary parts of the complex valued field FIELD in the first and second columns, respectively.
SEE ALSO
dirfile(5), printf(3)
Version 0.7.1 30 November 2010 dirfile2ascii(1)