reading arrays?

[panfilero]

hello, I'm new to C and have a pretty basic question. I have a 4 x 5 matrix saved in as a txt file and I can't figure out how to make my program stop reading the input file. I want the input to be stored in an array. I think there must be a way to do this by putting a while loop as the outer loop of my program but I'm not sure what condition to put in the loop.

this is my code:

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


FILE *fin, *fout;

main() {
       
       
       int A [4] [5] ;
       int r = 0;
       int c = 0;
       int r_max = 4;
       int c_max = 5;
       int i;
       	

                fin = fopen("matrix.txt", "r");	  
                fout = fopen("output.txt", "w");
	 
               
   
               	for(i = 0; r < r_max; i++) {
	for(j = 0; c < c_max; j++) {
	
                fscanf(fin, "%d", &A[i][j]);
	fprintf(fout, "%d ", A[i][j]);
	}
	fprintf(fout, "\n");
		}

but it just reads the input file forever and crashes, any help with this would be greatly appreciated, thank you.

[cwr]

Look at your for loops.. you are incrementing i, but checking the value of r. Inside, you are incrementing j, but checking the value of c, that doesn't make sense.

[panfilero]

ahhh true, thank you, i didn't notice that, i changed that in my code and also added a while loop, but my output is still going on forever, instead of stopping after reading the matrix, any idea why? here's my revised code. Thank you

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


FILE *fin, *fout;

main() {
       
       
       int A [3] [4] ;
       int r = 0;
       int c = 0;
       int r_max = 4;
       int c_max = 5;
       int i;
       int j;
       int k;

                fin = fopen("matrix.txt", "r");	  
                fout = fopen("output.txt", "w");
	 
               
   
  	while(fscanf(fin, "%d", &k)  != EOF ) {
      
    for(r = 0; r < r_max; r++) {
	for(c = 0; c < c_max; c++) {
	
    fscanf(fin, "%d", &A[i][j]);
	fprintf(fout, "%d ", A[i][j]);
	}
	fprintf(fout, "\n");
		}

      printf("%d",A[2][2]);
      
      getchar();
      
       }
}