Line from file isn't reading after using pointer inside the loop - c

Question

So I am trying to read a matrix from a file (I am sure there are better ways to do it than how I am doing it). I had a hard time figuring out how to read each word from the file (meaning each entry of the matrix) so decided to read each line and use something I found here in stackexchange called strtok.
The inside of my main() looks like this
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <malloc.h>
#include <time.h>
#include <string.h>
int main(){
FILE *f;
int nmatrix=3;
int nmax=3;
int something;
int number, count, count2, i, j;
srand(time(NULL));
size_t len = 0;
ssize_t read;
char * line = NULL;
char * pch;
int ia;
int (*B)[nmatrix][nmatrix] = malloc(nmatrix * nmatrix * sizeof(int));
while(nmatrix<=nmax){
// Creation of Matrix
f = fopen("matrix.txt", "w");
for(count = 1; count <= nmatrix; count ++){
for(count2 = 1; count2 <= nmatrix; count2 ++){
number = rand()%9;
fprintf(f, "%s%d ", " ", number);
}
fprintf(f, "%s\n", " ");
}
fclose(f);
// Reading Matrix
f = fopen("matrix.txt", "r");
i=0;
while((read = getline(&line, &len, f)) != -1) {
printf("%s\n", line);
pch = strtok(line," ,.-");
j=0;
while (pch != NULL & j<nmatrix){
ia= (int)*pch-48;
*B[i][j]= ia;
pch = strtok(NULL, " ,.-");
j=j+1;
}
i=i+1;
}
fclose(f);
nmatrix=nmatrix+1;
}
return 0;
}
The first output in terminal is if the line *B[i][j]= ia; is erased, and the second with it. The first ouput reads all the lines in the file and the second doesnt read the last. Why? (The output looks different cuz the matrices are generated at random).
Thanks in advance
I am fairly new to everything, specially pointers so if anything is not used correctly I'd appreciate the comment.

Answer 1

You had a couple of issues. You were using & instead of && (not really affecting it, but still wrong) and you had your pointer wrong in the assignment. I changed the output to display what is stored in the matrix, instead of the read line.
*B[i][j]= ia; needs to be (*B)[i][j]= ia;
// Reading Matrix
f = fopen("matrix.txt", "r");
i=0;
while((read = getline(&line, &len, f)) != -1) {
pch = strtok(line," ,.-");
j=0;
while (pch != NULL && j<nmatrix){
printf("\n%d %d :", i, j);
ia= (int)*pch-48;
(*B)[i][j]= ia;
printf("%d\n", (*B)[i][j]);
pch = strtok(NULL," ,.-");
j=j+1;
}
i=i+1;
}
fclose(f);

Answer 2

You have a lot of errors:
your string to break the numbers os the matrix are not inserted when you create the matrix: " ,.-". These must be inserted to be used in strtok function.
should be && instead of & in while statement
you have an extra } at the end of file.
both whiles to create the matrix should start at 0 and go to nmatrix with < symbol.
you should initialize the string line with "", not null.
int main(){
FILE *f;
int nmatrix=3;
int nmax=3;
int number, count, count2, i, j;
srand(time(NULL));
size_t len = 0;
ssize_t read;
char * line = "";
char * pch;
int ia;
int (*B)[nmatrix][nmatrix] = malloc(nmatrix * nmatrix * sizeof(int));
while(nmatrix<=nmax){
// Creation of Matrix
f = fopen("matrix.txt", "w");
for(count = 0; count < nmatrix; count ++){
for(count2 = 0; count2 < nmatrix; count2 ++){
number = rand()%9;
fprintf(f, "%s%d ", " ", number);
}
fprintf(f, "%s\n", " ");
}
fclose(f);
// Reading Matrix
f = fopen("matrix.txt", "r");
i=0;
while((read = getline(&line, &len, f)) != -1) {
printf("%s\n", line);
pch = strtok(line," ");
j=0;
while (pch != NULL && j < nmatrix){
ia= (int)*pch-48;
*B[i][j]= ia;
pch = strtok(NULL, " ");
j=j+1;
}
i=i+1;
}
fclose(f);
nmatrix=nmatrix+1;
}
return 0;
}