how to copy a file into an array?

[Guest]

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("nick.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)
{

int c,
char buffer[500];


int t;
if (!fscanf (fd,"%d\n",&c))
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[++t]= j+1;


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


}


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


curr= 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.

 

[CBFalconer]

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;

That is C++. Out the door, down the aisle, second door on the
right. Around here we deal only with the C language.

--
"If you want to post a followup via groups.google.com, don't use
the broken "Reply" link at the bottom of the article. Click on
"show options" at the top of the article, then click on the
"Reply" at the bottom of the article headers." - Keith Thompson
More details at: <http://cfaj.freeshell.org/google/>
Also see <http://www.safalra.com/special/googlegroupsreply/>

 

[Michael Mair]

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;

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.
<OT>
Have a look at the comp.lang.c++ FAQ to find out why "using
namespace XYZ;" on file level is a bad thing and what better
ways there are.
</OT>
If you are writing C programmes and compile them with a
C++ compiler: Don't do that. It may lead to subtle errors or
make perfectly valid C code uncompilable for you.

int Adj[MAX][MAX]; //The matrix of adjacent nodes
int curr[MAX]; //it gives the current index to retrieve the
neigbours of a node

This nicely illustrates why you should not use C99/C++
style line comments when posting to usenet: The line breaks
and the code can no longer be compiled. (Worse: If it still
can be compiled, it may do something different..)

int n=100;
void read_file(FILE* );

int main()
{

FILE *pf;
int i,r;


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

1 is no portable return value for main.

}


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


next_neighbour(1);

1) next_neighbour() is not defined here.
2) You do not fclose(pf) on the same "level" as you opened it.
This may be a design flaw.

return 0;
}


void read_file(FILE *fd)
{

int c,
char buffer[500];

You are not posting real code.
Come back with a minimal compiling example. In C.
Copy and paste the real code.


Cheers
Michael

 

[Captain Winston]

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;

It's used in C++, this is comp.lang.c, so it is off topic, please send
the thread to a C++ newsgroup, such as comp.lang.c++.

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("nick.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)
{

int c,
char buffer[500];


int t;
if (!fscanf (fd,"%d\n",&c))

<OT>
A question:
why do you use a "\n" in fscanf.

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[++t]= j+1;


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


}


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


curr= 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.