reading file and copying it into array...

[Shuch]

Hi all,
i m trying to read from a file and then copy it into an array...my
code is as follow..it runs fine but i cant understand y it doesnt show
me any output??
here is my code...
using namespace std;
int Adj[MAX][MAX]; //The matrix of adjacent nodes
int curr[MAX]; //it gives the current index to retrieve the
neigbours of a node
int n=100;
void read_file(FILE* );
int main()
{
FILE *pf;
int i,r;

if((pf=fopen("n ick.txt","r"))= = NULL){
printf("error opening nick.txt file");
return 1;
}

read_file(pf); //function to create the matrix Adj[][]

next_neighbour( 1);
return 0;
}

void read_file(FILE *fd)
{

char buffer[500];

int t;
if (!fscanf (fd,"%d\n",&n))
printf("error reading the file");
for (int i=1; i<=n;i++){
fgets (buffer, sizeof(buffer), fd);

t=0;
for (int j=0; j<n;j++){
printf(" %d ", buffer[j]-'0');

if((buffer[j]-'0')== 1)

{
Adj[i][++t]= j+1;

printf(" %d ", Adj[i][j]);
//cout<<Ad[i][j].....but nothin works :(

}

}
//printf("\n");
//printf("\n");

curr[i]= 1;
}

fclose(fd);

}
-----------------------------------------
the contents of my file looks like as follow:
nick.txt:
0 3 -1 3 -1 -1 -1
3 0 2 -1 -1 -1 -1
-1 2 0 2 2 -1 -1
3 -1 2 0 6 -1 -1
-1 -1 2 6 0 4 3
-1 -1 -1 -1 4 0 -1
-1 -1 -1 -1 3 -1 0
--------------------------------------------------
i want this input to b stored inside an array....how can i read this
file and store it inside array Adj??????any help will b greatly
appreciated...
regards.

[Daniel T.]

In article <11************ **********@e56g 2000cwe.googleg roups.com>,
"Shuch" <Sh**********@g mail.com> wrote:

Hi all,
i m trying to read from a file and then copy it into an array...my
code is as follow..it runs fine but i cant understand y it doesnt show
me any output??
here is my code...
using namespace std;
int Adj[MAX][MAX]; //The matrix of adjacent nodes
int curr[MAX]; //it gives the current index to retrieve the
neigbours of a node
int n=100;
void read_file(FILE* );
int main()
{
FILE *pf;
int i,r;

if((pf=fopen("n ick.txt","r"))= = NULL){
printf("error opening nick.txt file");
return 1;
}

read_file(pf); //function to create the matrix Adj[][]

next_neighbour( 1);
return 0;
}

void read_file(FILE *fd)
{

char buffer[500];

int t;
if (!fscanf (fd,"%d\n",&n))
The above line changes the value of 'n' to whatever the first value in
your file is (ie 0.)
printf("error reading the file");
Your loop below is never entered because at this point, 'n' equals 0.
for (int i=1; i<=n;i++){
fgets (buffer, sizeof(buffer), fd);

t=0;
for (int j=0; j<n;j++){
printf(" %d ", buffer[j]-'0');

if((buffer[j]-'0')== 1)

{
Adj[i][++t]= j+1;

printf(" %d ", Adj[i][j]);
//cout<<Ad[i][j].....but nothin works :(

}

}
//printf("\n");
//printf("\n");

curr[i]= 1;
}

fclose(fd);

}
-----------------------------------------
the contents of my file looks like as follow:
nick.txt:
0 3 -1 3 -1 -1 -1
3 0 2 -1 -1 -1 -1
-1 2 0 2 2 -1 -1
3 -1 2 0 6 -1 -1
-1 -1 2 6 0 4 3
-1 -1 -1 -1 4 0 -1
-1 -1 -1 -1 3 -1 0
--------------------------------------------------
i want this input to b stored inside an array....how can i read this
file and store it inside array Adj??????any help will b greatly
appreciated...
regards.

--
Magic depends on tradition and belief. It does not welcome observation,
nor does it profit by experiment. On the other hand, science is based
on experience; it is open to correction by observation and experiment.

[Shuch]

but still...after makin those changes..now when i m tryin to
print...its printin some nonsense..:((.. .here is the code again...:
int main()
{

FILE *pf;
int i,r;

if((pf=fopen("n ick.txt","r"))= = NULL){
printf("error opening nick.txt file");
return 1;
}

read_file(pf); //function to create the matrix Adj[][]

//next_neighbour( 1);
return 0;
}

void read_file(FILE *fd)
{

char buffer[500];
int c;
int t;
if (!fscanf (fd,"%d\n",&c))
printf("error reading the file");
// do{
//}while (c != EOF);*/
for (int i=1; i<=n;i++){
fgets (buffer, sizeof(buffer), fd);

t=0;
for (int j=0; j<n;j++){
// printf(" %d ", buffer[j]-'0');

if((buffer[j]-'0')== 1)

{
Adj[i][++t]= j+1;

//printf(" %d ", Adj[i][j]);

}

}
//printf("\n");
//printf("\n");

curr[i]= 1;
}
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
cout<<Adj[i][j];
fclose(fd);

}

-------------------------------------
now the output is comin as:
C:\Documents and
Settings\shuch\ cbproject\readF ile\windows\Deb ug_Build\readFi le.exe
000000000004912 150000008111417 000000213160000 000413160000000 250000000025811 180000025811160 000058111600000 058111600000049 121500000081114 170000002131600 000004131600000 002500000000258 111800000258111 600000581116000 000581116000000 581116111110811 141700000021316 000000041316000 000025000000002 581118000002581 116000005811160 000005811160000 005811161111111 111111110213160 000000413160000 000250000000025 811180000025811 160000058111600 000058111600000 058111611111111 111111111111111 110413160000000 250000000025811 180000025811160 000058111600000 058111600000058 111611111111111 111111111111111 111111111025000 000002581118000 002581116000005 811160000005811 160000005811161 111111111111111 111111111111111 111111111111110 258111800000258 111600000581116 000000581116000 000581116111111 111111111111111 111111111111111 111111111111111 111102581116000 005811160000005 811160000005811 161111111111111 111111111111111 111111111111111 111111111111111 111111105811160 000005811160000 005811161111111 111111111111111 111111111111111 111111111111111 111111111111111 111111110581116 0000005
------------------------------------------------------------------
THIS IS SOOO RANDOM...wat should i do?????

[Daniel T.]

In article <11************ **********@j33g 2000cwa.googleg roups.com>,
"Shuch" <Sh**********@g mail.com> wrote:

but still...after makin those changes..now when i m tryin to
print...its printin some nonsense..:((.. .here is the code again...:
int main()
{

FILE *pf;
int i,r;

if((pf=fopen("n ick.txt","r"))= = NULL){
printf("error opening nick.txt file");
return 1;
}

read_file(pf); //function to create the matrix Adj[][]

//next_neighbour( 1);
return 0;
}

void read_file(FILE *fd)
{

char buffer[500];
int c;
int t;
if (!fscanf (fd,"%d\n",&c))
printf("error reading the file");
// do{
//}while (c != EOF);*/
for (int i=1; i<=n;i++){
fgets (buffer, sizeof(buffer), fd);

t=0;
for (int j=0; j<n;j++){
// printf(" %d ", buffer[j]-'0');

if((buffer[j]-'0')== 1)

{
Adj[i][++t]= j+1;

//printf(" %d ", Adj[i][j]);

}

}
//printf("\n");
//printf("\n");

curr[i]= 1;
}
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
cout<<Adj[i][j];
fclose(fd);

}

-------------------------------------
now the output is comin as:
C:\Documents and
Settings\shuch\ cbproject\readF ile\windows\Deb ug_Build\readFi le.exe
000000000004912 150000008111417 000000213160000 000413160000000 250000000025811 180
000025811160000 058111600000058 111600000049121 500000081114170 000002131600000 004
131600000002500 000000258111800 000258111600000 581116000000581 116000000581116 111
110811141700000 021316000000041 316000000025000 000002581118000 002581116000005 811
160000005811160 000005811161111 111111111110213 160000000413160 000000250000000 025
811180000025811 160000058111600 000058111600000 058111611111111 111111111111111 110
413160000000250 000000025811180 000025811160000 058111600000058 111600000058111 611
111111111111111 111111111111111 111025000000002 581118000002581 116000005811160 000
005811160000005 811161111111111 111111111111111 111111111111111 111110258111800 000
258111600000581 116000000581116 000000581116111 111111111111111 111111111111111 111
111111111111111 111102581116000 005811160000005 811160000005811 161111111111111 111
111111111111111 111111111111111 111111111111111 111105811160000 005811160000005 811
161111111111111 111111111111111 111111111111111 111111111111111 111111111111111 110
5811160000005
------------------------------------------------------------------
THIS IS SOOO RANDOM...wat should i do?????

First, you should past the actual code rather than what you have above.
Second, you should consider posting that code in a C newsgroup instead
of a C++ newsgroup.

What is it you are trying to do? Not exactly, but in an abstract sense.
Is this the only input file the code will ever have to read? If not,
will other files all have the same width and height? If not, will they
all be squares?

Frankly, the easiest solution to your problem would be something like:

const int Adj[7][7] = { { 0, 3, -1, 3, -1, -1, -1 },
{ 3, 0, 2, -1, -1, -1, -1 },
{ -1, 2, 0, 2, 2, -1, -1 },
{ 3, -1, 2, 0, 6, -1, -1 },
{ -1, -1, 2, 6, 0, 4, 3 },
{ -1, -1, -1, -1, 4, 0, -1 },
{ -1, -1, -1, -1, 3, -1, 0 } };

int main()
{
for ( int i = 0; i < 7; ++i ) {
for ( int j = 0; j < 7; ++j )
cout << Adj[i][j] << " ";
cout << '\n';
}
}

--
Magic depends on tradition and belief. It does not welcome observation,
nor does it profit by experiment. On the other hand, science is based
on experience; it is open to correction by observation and experiment.

[Shuch]

i know thats the easiest solun...but i dont have to do it...i have to
read from the input file thats called nick.txt...n it has the contents
as i mentioned above...no the size can change...the size of the file is
defined at the beginning...the size of the file is unknown...we dunno
how much it can be...n yeah it will always b in squares...
n i had already posted it in C but no one replied to me :(....i really
need a way out of this problem...but cant understand how to read it
from the file into an array....there isnt any solution that i can
follow...i dont have to have it in C...i can do it in C++ as well...do
u have some other idea that i can use...already i have spent sooo many
hours now...but cant figure it out...:((

[Larry I Smith]

Shuch wrote:

but still...after makin those changes..now when i m tryin to
print...its printin some nonsense..:((.. .here is the code again...:
int main()
{

FILE *pf;
int i,r;

if((pf=fopen("n ick.txt","r"))= = NULL){
printf("error opening nick.txt file");
return 1;
}

read_file(pf); //function to create the matrix Adj[][]

//next_neighbour( 1);
return 0;
}

void read_file(FILE *fd)
{

char buffer[500];
int c;
int t;
Where is 'n' defined?
Where is a value assigned to 'n'?
if (!fscanf (fd,"%d\n",&c))
printf("error reading the file");
// do{
//}while (c != EOF);*/
for (int i=1; i<=n;i++){
'n' has not been defined, or had its value set.
fgets (buffer, sizeof(buffer), fd);

t=0;
for (int j=0; j<n;j++){
// printf(" %d ", buffer[j]-'0');

if((buffer[j]-'0')== 1)

{
Adj[i][++t]= j+1;

//printf(" %d ", Adj[i][j]);

}

}
//printf("\n");
//printf("\n");

curr[i]= 1;
}
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
cout<<Adj[i][j];
fclose(fd);

}

-------------------------------------
now the output is comin as:
C:\Documents and
Settings\shuch\ cbproject\readF ile\windows\Deb ug_Build\readFi le.exe
000000000004912 150000008111417 000000213160000 000413160000000 250000000025811 180000025811160 000058111600000 058111600000049 121500000081114 170000002131600 000004131600000 002500000000258 111800000258111 600000581116000 000581116000000 581116111110811 141700000021316 000000041316000 000025000000002 581118000002581 116000005811160 000005811160000 005811161111111 111111110213160 000000413160000 000250000000025 811180000025811 160000058111600 000058111600000 058111611111111 111111111111111 110413160000000 250000000025811 180000025811160 000058111600000 058111600000058 111611111111111 111111111111111 111111111025000 000002581118000 002581116000005 811160000005811 160000005811161 111111111111111 111111111111111 111111111111110 258111800000258 111600000581116 000000581116000 000581116111111 111111111111111 111111111111111 111111111111111 111102581116000 005811160000005 811160000005811 161111111111111 111111111111111 111111111111111 111111111111111 111111105811160 000005811160000 005811161111111 111111111111111 111111111111111 1111111111111 111111111111111 111111111105811 160000005 ------------------------------------------------------------------
THIS IS SOOO RANDOM...wat should i do?????

[Shuch]

n is defined in my FIRST POST...as u can c at the declaration part....

using namespace std;
int Adj[MAX][MAX]; //The matrix of adjacent nodes
int curr[MAX]; //it gives the current index to retrieve the
neigbours of a node
int n=100;
void read_file(FILE* );
int main()
{

FILE *pf;
int i,r;
if((pf=fopen("n ick.txt","r"))= = NULL){
printf("error opening nick.txt file");
return 1;
}
read_file(pf); //function to create the matrix Adj[][]
next_neighbour( 1);
return 0;
}
-----------------------------------------------
rest is the same code....now can ANYONE JUST TELL ME THE MAIN
IDEA...INSTEAD OF ASKING ME SOOOO MANY QUESTIONS...jus t tell me how can
i write from a file into a 2D ARRAY....if this program is wrong...then
just tell me the correct version of it...

[Shuch]

and also as Daniel said its a C code....i just got a reply from
comp.lang.c.... saying
"This is comp.lang.c where we discuss standard C.
The above is a using directive; C++ knows these, C does not.
If you have a C++ language, ask in comp.lang.c++; C++ stream
handling differs from C file I/O. "

[Daniel T.]

In article <11************ **********@v46g 2000cwv.googleg roups.com>,
"Shuch" <Sh**********@g mail.com> wrote:

i know thats the easiest solun...but i dont have to do it...i have to
read from the input file thats called nick.txt...n it has the contents
as i mentioned above...no the size can change...the size of the file is
defined at the beginning...the size of the file is unknown...we dunno
how much it can be...n yeah it will always b in squares...
n i had already posted it in C but no one replied to me :(....i really
need a way out of this problem...but cant understand how to read it
from the file into an array....there isnt any solution that i can
follow...i dont have to have it in C...i can do it in C++ as well...do
u have some other idea that i can use...already i have spent sooo many
hours now...but cant figure it out...:((

OK, so you are given a file with X integers per line, X lines long and
you need to read it into an array. Is that right? Maybe if you printed
the assignment exactly as written...
--
Magic depends on tradition and belief. It does not welcome observation,
nor does it profit by experiment. On the other hand, science is based
on experience; it is open to correction by observation and experiment.

[Shuch]

exactly Daniel...this is exactly my problem...i have no clue wat is
there in my input file...its just some input file with X number of rows
and X number of columns...and i have to read the input file and store
them into an array....