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Weird lcc-win32 behaviour

While I can compile the program below under freebsd via a simple:
gcc prog1.c -o prog1
and it runs smoothly, I'm experiencing annoying problems with lcc-win32
under windows xp pro. In fact, under wedit, I can smoothly compile the
program but when I try to execute it it ends with an "abnormal termination"
and a popup complains that:

lcc runtime
Exception 0xc0000005
segment violation
address 0x73d115ce

The weirdness is greater if you think that cutting many lines of the program
and stopping the execution imediatedly after the line
fscanf(fp,"%d%d ",&R,&C);

lcc-win32 chokes on the same exception.

Please help
Vittorio

For thoes who wants to have a go here is prog1.c

/* prog1.c */
/* PROGRAMMA 1
Il file matrice.txt (presente nella cartella esame) contiene alcuni dati
cosi' organizzati:
R C
a0,0 a0,1 a0,2 a0,3 ... a0,C-1
a1,0 a1,1 a1,2 a1,3 ... a1,C-1
a2,0 a2,1 a2,2 a2,3 ... a2,C-1
.......
aR-1,0 aR-1,1............ aR-1,C-1

dove R e C indicano il numero di righe e di colonne della matrice che segue,
e l'elemento generico ai,j e' un reale.
Si chiede di scrivere un programma che:

- legga questo file, trasferendo i valori in una matrice di reali (float)
allocata dinamicamente
- allochi una seconda matrice di reali delle stesse dimensioni
- ponga nell'elemento i,,j della seconda matrice la somma di tutta la riga i
e di tutta la colonna j della prima matrice
- scriva la matrice risultante nel file destinazione.tx t, in modalita'
testo, con una sola cifra decimale per ogni elemento

Al termine chiudere i file e liberare la memoria. */
#include <stdio.h>
#include <stdlib.h>
void main(void){
int i,j;
int R,C;

/*Leggo matrice.txt,tra sferendo i valori in una matrice m1 di reali
allocata dinamicamente*/
FILE *fp;
fp=fopen("matri ce.txt","r");
fscanf(fp,"%d%d ",&R,&C);

float **m1;
m1=(float**)mal loc(sizeof(floa t*)*R);
for(i=0;i<R;i++ )
m1[i]=(float*)malloc (sizeof(float)* C);

for(i=0;i<R;i++ )
for(j=0;j<C;j++ )
fscanf(fp,"%f", &m1[i][j]);
for(i=0;i<R;i++ ){
for(j=0;j<C;j++ )
printf("%6.1f", m1[i][j]);
printf("\n");
}
/*Alloco una seconda matrice di reali delle stesse dimensioni*/
float **m2;
m2=(float**)mal loc(sizeof(floa t*)*R);
for(i=0;i<R;i++ )
m2[i]=(float*)malloc (sizeof(float)* C);
/*Pongo nell'elemento i,j della seconda matrice la somma di tutta la riga i
e di tutta la colonna j della prima matrice*/

/*r, e c sono 2 vettori in cui pongo la somma dellle righe e colonne */
float *r,
*c;
r=(float*)mallo c(sizeof(float) *R);
c=(float*)mallo c(sizeof(float) *C);

for(i=0;i<R;i++ ){
r[i]=0;
for(j=0;j<C;j++ )
r[i]+=m1[i][j];
printf("r %8.1f \n", r[i]);
}

for(j=0;j<C;j++ ){
c[j]=0;
for(i=0;i<R;i++ )
c[j]+=m1[i][j];
printf("c %8.1f \n", c[j]);
}

for(i=0;i<R;i++ )
for(j=0;j<C;j++ )
m2[i][j]=r[i]+c[j];
FILE *fo;
fo=fopen("desti nazione.txt","w ");

for(i=0;i<R;i++ ){
for(j=0;j<C;j++ )
fprintf(fo,"%6. 1f",m2[i][j]);
fprintf(fo,"\n" );
}
/*Chiudo i file e libero la memoria*/
fclose(fp);
fclose(fo);
for(i=0;i<R;i++ )
free(m1[i]);
free(m2[i]);
free(r);
free(c);
free(m1);
free(m2);
}



Dec 11 '05 #1
14 3797
vittorio <vi****@SPAM-tin.it> wrote in
news:43******** *************** @reader3.news.t in.it:
While I can compile the program below under freebsd via a simple:
gcc prog1.c -o prog1
and it runs smoothly, I'm experiencing annoying problems with
lcc-win32 under windows xp pro. In fact, under wedit, I can smoothly
compile the program but when I try to execute it it ends with an
"abnormal termination" and a popup complains that:

lcc runtime
Exception 0xc0000005
segment violation
address 0x73d115ce


<code snipped>

Please indent properly and consistently, and use some extra whitespace.

I see no error-checking for the fopen, fscanf, and malloc calls.

There are quite a few extra-ugly casts floating around.

I would first see what fscanf returns, and whether R and C contain what
you thought they should.

Sinan

--
A. Sinan Unur <1u**@llenroc.u de.invalid>
(reverse each component and remove .invalid for email address)
Dec 11 '05 #2
A. Sinan Unur wrote:
vittorio <vi****@SPAM-tin.it> wrote in
news:43******** *************** @reader3.news.t in.it:
While I can compile the program below under freebsd via a simple:
gcc prog1.c -o prog1
and it runs smoothly, I'm experiencing annoying problems with
lcc-win32 under windows xp pro. In fact, under wedit, I can smoothly
compile the program but when I try to execute it it ends with an
"abnormal termination" and a popup complains that:

lcc runtime
Exception 0xc0000005
segment violation
address 0x73d115ce


<code snipped>

Please indent properly and consistently, and use some extra whitespace.

I see no error-checking for the fopen, fscanf, and malloc calls.

There are quite a few extra-ugly casts floating around.

I would first see what fscanf returns, and whether R and C contain what
you thought they should.

Sinan

Sinan,
as I said even shortening the program at the line
"fscanf(fp,"%d% d",&R,&C);" lcc-win32 compiles smoothly but don't exewcute
it giving the same lcc runtime exception. Therefore, No way to check what R
& C are like. While - I repeat under freebsd no problems!

By the way a lessical question: what do you exactly mean with "...There are
quite a few extra-ugly casts floating around...": what are extra-ugly
casts?

Ciao
Vittorio
Dec 11 '05 #3
vittorio <vi****@SPAM-tin.it> wrote in
news:43******** **************@ reader4.news.ti n.it:
A. Sinan Unur wrote:
vittorio <vi****@SPAM-tin.it> wrote in
news:43******** *************** @reader3.news.t in.it:
While I can compile the program below under freebsd via a simple:
gcc prog1.c -o prog1
and it runs smoothly, I'm experiencing annoying problems with
lcc-win32 under windows xp pro. In fact, under wedit, I can smoothly
compile the program but when I try to execute it it ends with an
"abnormal termination" and a popup complains that:

lcc runtime
Exception 0xc0000005
segment violation
address 0x73d115ce
<code snipped>

Please indent properly and consistently, and use some extra
whitespace.

I see no error-checking for the fopen, fscanf, and malloc calls.

There are quite a few extra-ugly casts floating around.

I would first see what fscanf returns, and whether R and C contain
what you thought they should.

Sinan

Sinan,
as I said even shortening the program at the line
"fscanf(fp,"%d% d",&R,&C);" lcc-win32 compiles smoothly but don't
exewcute it giving the same lcc runtime exception.


Then please provide the shortest possible code that we can compile by
just copying and pasting, along with sample input.
By the way a lessical question: what do you exactly mean with
"...There are quite a few extra-ugly casts floating around...": what
are extra-ugly casts?


The following is an ugly cast:

#include <stdlib.h>

....

float **m1;
m1=(float**)mal loc(sizeof(floa t*)*R);

The cast (float**) is not needed. It clutters the code, and if you ever
did forget to include stdlib.h, you would not get a warning.

From what I can surmise, the recommended replacement for the above is:

float **m1 = malloc(R * sizeof(*m1));

which is far less error prone, and if you ever changed the type of m1,
you only need to do it in one place. (BTW, why aren't you using
doubles?)

Sinan
--
A. Sinan Unur <1u**@llenroc.u de.invalid>
(reverse each component and remove .invalid for email address)

comp.lang.perl. misc guidelines on the WWW:
http://mail.augustmail.com/~tadmc/cl...uidelines.html

Dec 11 '05 #4
vittorio wrote:
for(i=0;i<R;i++ )
free(m1[i]);
free(m2[i]);


You try to free m2[R]. But m2 only has valid indices 0 ... (R-1).
This might be what's crashing your program.
I think you meant to write:

for (i = 0; i < R; ++i)
{
free(m1[i]);
free(m2[i]);
}

Also, do not cast the value returned by malloc.
It gains you nothing, and can be a source of errors.

Dec 11 '05 #5
A. Sinan Unur wrote:
vittorio <vi****@SPAM-tin.it> wrote in
news:43******** **************@ reader4.news.ti n.it:
A. Sinan Unur wrote:
vittorio <vi****@SPAM-tin.it> wrote in
news:43******** *************** @reader3.news.t in.it:

While I can compile the program below under freebsd via a simple:
gcc prog1.c -o prog1
and it runs smoothly, I'm experiencing annoying problems with
lcc-win32 under windows xp pro. In fact, under wedit, I can smoothly
compile the program but when I try to execute it it ends with an
"abnormal termination" and a popup complains that:

lcc runtime
Exception 0xc0000005
segment violation
address 0x73d115ce

<code snipped>

Please indent properly and consistently, and use some extra
whitespace.

I see no error-checking for the fopen, fscanf, and malloc calls.

There are quite a few extra-ugly casts floating around.

I would first see what fscanf returns, and whether R and C contain
what you thought they should.

Sinan

Sinan,
as I said even shortening the program at the line
"fscanf(fp,"%d% d",&R,&C);" lcc-win32 compiles smoothly but don't
exewcute it giving the same lcc runtime exception.


Then please provide the shortest possible code that we can compile by
just copying and pasting, along with sample input.
By the way a lessical question: what do you exactly mean with
"...There are quite a few extra-ugly casts floating around...": what
are extra-ugly casts?


The following is an ugly cast:

#include <stdlib.h>

...

float **m1;
m1=(float**)mal loc(sizeof(floa t*)*R);

The cast (float**) is not needed. It clutters the code, and if you ever
did forget to include stdlib.h, you would not get a warning.

From what I can surmise, the recommended replacement for the above is:

float **m1 = malloc(R * sizeof(*m1));

which is far less error prone, and if you ever changed the type of m1,
you only need to do it in one place. (BTW, why aren't you using
doubles?)


Here you are a working-under-nix extract of the same long code I sent to
this NG causing the same error under lcc-win32 XP pro:

lcc runtime
Exception 0xc0000005
segment violation
address 0x73d115ce

At the end the 3 lines of the file matrice.txt

Many thanks for your help
Vittorio
=============== =============== =============== ======0
#include <stdio.h>
#include <stdlib.h>
void main(void){
int i,j;
int R,C;

/*Leggo matrice.txt,tra sferendo i valori in una matrice m1 di reali
allocata dinamicamente*/
FILE *fp;
fp=fopen("matri ce.txt","r");
fscanf(fp,"%d%d ",&R,&C);

float **m1;
m1=(float**)mal loc(sizeof(floa t*)*R);
for(i=0;i<R;i++ )
m1[i]=(float*)malloc (sizeof(float)* C);

for(i=0;i<R;i++ )
for(j=0;j<C;j++ )
fscanf(fp,"%f", &m1[i][j]);
for(i=0;i<R;i++ ){
for(j=0;j<C;j++ )
printf("%6.1f", m1[i][j]);
printf("\n");
}
fclose(fp);
}
=============== =============== =============== =======
matrice.txt
2 3
98.5 07.1 -2.3
86.5 -9.6 -8.4
Dec 11 '05 #6
vittorio <vi****@SPAM-tin.it> wrote in
news:43******** *************** @reader2.news.t in.it:
A. Sinan Unur wrote:
Then please provide the shortest possible code that we can compile by
just copying and pasting, along with sample input.

.... Here you are a working-under-nix extract of the same long code I sent
to this NG causing the same error under lcc-win32 XP pro:
I edited your code a little:

#include <stdio.h>
#include <stdlib.h>

int main(void){
int i,j;
int R,C;

float **m1;

FILE *fp;
fp = fopen("matrice. txt","r");
if ( !fp ) {
fprintf(stderr, "Cannot open matrice.txt\n") ;
exit(EXIT_FAILU RE);
}
if ( 2 != fscanf(fp, "%d%d", &R, &C) ) {
fprintf(stderr, "Cannot read dimensions\n");
exit(EXIT_FAILU RE);
}

printf("Rows: %d\tColumns: %d\n", R, C);

m1 = malloc(R * sizeof(*m1));
if ( !m1 ) {
fprintf(stderr, "Cannot allocate memory: Line: %d\n", __LINE__);
exit(EXIT_FAILU RE);
}

for ( i = 0; i < R; i++ ) {
m1[i] = malloc(C * sizeof(*m1[i]));
if ( !m1[i] ) {
fprintf(stderr, "Cannot allocate memory: Line: %d\n",
__LINE__);
exit(EXIT_FAILU RE);
}
}

for ( i = 0; i < R; i++ ) {
for ( j = 0; j < C; j++ ) {
fscanf(fp, "%f", &m1[i][j]);
}
}

for ( i = 0; i < R; i++ ) {
for ( j = 0; j < C; j++ ) {
printf("%6.1f", m1[i][j]);
printf("\n");
}
fclose(fp);
}

return 0;
}

and ran it with the file you supplied:
matrice.txt
2 3
98.5 07.1 -2.3
86.5 -9.6 -8.4


Running on Win XP SP2 after compiling with lcc:

Rows: 2 Columns: 3
98.5
7.1
-2.3
86.5
-9.6
-8.4

"d:\home\asu1\u senet\clc\lcc\m 1.exe"
Return code 0
Execution time 0.032 seconds
Press any key to continue...

I'll repeat: Add some error checking to your code.

--
A. Sinan Unur <1u**@llenroc.u de.invalid>
(reverse each component and remove .invalid for email address)
Dec 11 '05 #7
On Sun, 11 Dec 2005 22:08:58 +0000, in comp.lang.c , vittorio
<vi****@SPAM-tin.it> wrote:
Here you are a working-under-nix extract of the same long code I sent to
this NG causing the same error under lcc-win32 XP pro:
Please turn up warnings in your compiler.
#include <stdio.h>
#include <stdlib.h>
void main(void){
illegal declaration of main, which must return an int.
int i,j;
int R,C;

/*Leggo matrice.txt,tra sferendo i valori in una matrice m1 di reali
allocata dinamicamente*/
FILE *fp;
fp=fopen("matri ce.txt","r");
did this call succeed? You should check. This is a very possible
cause - I wonder where lcc-win32 creates its debug executables, in a
subdirectory maybe?
fscanf(fp,"%d%d ",&R,&C);

float **m1;
Unless you have a very new compiler, you can't declare variables after
executable statements. I don't know if lcc-win32 suupports this/
m1=(float**)mal loc(sizeof(floa t*)*R);
the cast is not required, and it is strongly recommended you do NOT
include it. Ben Pfaff has an excellent explanation of why on his
website. By the way, if your compiler complains about needing the
cast, its a C++ compiler.
for(i=0;i<R;i++ )
m1[i]=(float*)malloc (sizeof(float)* C);

for(i=0;i<R;i++ )
for(j=0;j<C;j++ )
fscanf(fp,"%f", &m1[i][j]);
missing indentation. Not critical, but confusing. I strongly recommend
braces, even for one-liners.
for(i=0;i<R;i++ ){
for(j=0;j<C;j++ )
printf("%6.1f", m1[i][j]);
printf("\n");
}
fclose(fp);
}


This code works correctly, once the problems mentioned above are
fixed.

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Dec 11 '05 #8
vittorio a écrit :
While I can compile the program below under freebsd via a simple:
gcc prog1.c -o prog1
and it runs smoothly, I'm experiencing annoying problems with lcc-win32
under windows xp pro. In fact, under wedit, I can smoothly compile the
program but when I try to execute it it ends with an "abnormal termination"
and a popup complains that:

lcc runtime
Exception 0xc0000005
segment violation
address 0x73d115ce

The weirdness is greater if you think that cutting many lines of the program
and stopping the execution imediatedly after the line
fscanf(fp,"%d%d ",&R,&C);

lcc-win32 chokes on the same exception.


You don't test the return of fopen(). Anything can happen.

You code is full of useless cast but important things like error
checking is totally missing.

This works fine to me (I'm using Code::Blocks)

#include <stdio.h>
#include <stdlib.h>
#define FNAME "matrice.tx t"

int main(void)
{
FILE *fp = fopen(FNAME, "r");

if (fp != NULL)
{
int R, C;

int err = fscanf(fp, "%d%d", &R, &C) != 2;

if (!err)
{
float **m1 = malloc (sizeof * m1 * R);

printf ("creating a %d x %d matrix\n", R, C);

if (m1 != NULL)
{
{
int i;
for (i = 0; i < R; i++)
{
m1[i] = malloc(sizeof * m1[i] * C);
err = m1[i] == NULL;
}
}

if (!err)
{
{
int i;
for (i = 0;i < R && !err;i++)
{
int j;
for (j = 0;j < C && !err;j++)
{
int n = fscanf(fp, "%f", &m1[i][j]);

err = n != 1;
}
}
}

if (!err)
{
printf ("%d x %d matrix created\n", R, C);
{
int i;
for (i = 0;i < R;i++)
{
int j;
for (j = 0;j < C;j++)
{
printf("%6.1f", m1[i][j]);
}
printf("\n");
}
}

{
float **m2 = malloc(sizeof * m2 * R);

if (m2 != NULL)
{
{
int i;
for (i = 0;i < R;i++)
{
m2[i] = malloc(sizeof * m2[i] * C);

err = m2[i] == NULL;
}
}

if (!err)
{
float *r = malloc(sizeof * r * R);

if (r != NULL)
{
float *c = malloc(sizeof * c * C);

if (c != NULL)
{
{
int i;
for (i = 0;i < R;i++)
{
int j;
r[i] = 0;
for (j = 0;j < C;j++)
{
r[i] += m1[i][j];
}
printf("r %8.1f \n", r[i]);
}
}

{
int j;
for (j = 0;j < C;j++)
{
int i;
c[j] = 0;
for (i = 0;i < R;i++)
{
c[j] += m1[i][j];
}
printf("c %8.1f \n", c[j]);
}
}

{
int i;
for (i = 0;i < R;i++)
{
int j;
for (j = 0;j < C;j++)
{
m2[i][j] = r[i] + c[j];
}
}
}

{
FILE *fo =
fopen("destinaz ione.txt", "w");

if (fo != NULL)
{
int i;
for (i = 0;i < R;i++)
{
int j;
for (j = 0;j < C;j++)
{
fprintf(fo, "%6.1f",
m2[i][j]);
}
fprintf(fo, "\n");
}

fclose(fo);
}
}
free(c), c = NULL;
}
free(r), r = NULL;
}

}

{
int i;
for (i = 0;i < R;i++)
{
free(m2[i]);
}
}
free(m2);
printf ("matrix m2 freed\n");
}
}
}
else
{
printf ("input error (data)\n");
}

{
int i;
for (i = 0;i < R;i++)
{
free(m1[i]);
}
}
}

free(m1), m1 = NULL;
printf ("matrix m1 freed\n");
}
}
else
{
printf ("input error (R,C)\n");
}
fclose(fp), fp = NULL;
}
else
{
perror(FNAME);
}

return 0;
}

The input file:

2 3
1 2 3
4 5 6

produces:

11.0 13.0 15.0
20.0 22.0 24.0

The standard output:

creating a 2 x 3 matrix
2 x 3 matrix created
1.0 2.0 3.0
4.0 5.0 6.0
r 6.0
r 15.0
c 5.0
c 7.0
c 9.0
matrix m2 freed
matrix m1 freed
Note : As you can see, due to an intense refactoring based on a dramatic
reducing of the variables scopes, the code has been prepared to be
modularized. You really should learn how to write functions, instead of
repeating the same things... It's boring...

--
A+

Emmanuel Delahaye
Dec 12 '05 #9
Mark McIntyre a écrit :
On Sun, 11 Dec 2005 22:08:58 +0000, in comp.lang.c , vittorio
<vi****@SPAM-tin.it> wrote:

Here you are a working-under-nix extract of the same long code I sent to
this NG causing the same error under lcc-win32 XP pro:

Please turn up warnings in your compiler.

#include <stdio.h>
#include <stdlib.h>
void main(void){

illegal declaration of main, which must return an int.

int i,j;
int R,C;

/*Leggo matrice.txt,tra sferendo i valori in una matrice m1 di reali
allocata dinamicamente*/
FILE *fp;
fp=fopen("matri ce.txt","r");

did this call succeed? You should check. This is a very possible
cause - I wonder where lcc-win32 creates its debug executables, in a
subdirectory maybe?

fscanf(fp,"%d%d ",&R,&C);

float **m1;

Unless you have a very new compiler, you can't declare variables after
executable statements. I don't know if lcc-win32 suupports this/


This is standard C. lcc-win32 supports it.
Declaring variables anywhere is supported since at least 2 years now.

jacob
Dec 12 '05 #10

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8613
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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9172
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
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9032
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
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8880
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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7745
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
6532
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
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4626
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
3054
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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2344
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.

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