from input file to array

[andyg55]

input file:

1 0 0
2 1 0
0 2 1

I would like to produce this in a 3x3 array on screen. My code:

#include <fstream.h>
#include <stdlib.h>

int i, j;
int matrix[3][3]; 

int main () {

ifstream inFile;
inFile.open("input.txt");

  if (!inFile)
  {
  printf ("Unable to open input file");            
  exit(1);
  }

  for (i=0; i < 3; i++){
  for (j = 0; j < 3; j++)
    {
        inFile >> matrix[i][j];
    }
printf("%d\t", matrix[i][j]);

inFile.close ();


}

Could someone correct what I am doing wrong please?

Thank you :)

p.s. sorry for the ancient headers

[Agni]

printf("%d\t", matrix[j]); shd be inside the inner loop ...

[andyg55]

Like this...?

for (i=0; i < 3; i++){

  printf("\n%f\t%f\t%f", matrix[i][j]);
  
  for (j = 0; j < 3; j++)
    {
        inFile >> matrix[i][j];
    }
}

...still doesnt work.

[Agni]

Inside the Inner Loop

for (i=0; i < 3; i++){

  for (j = 0; j < 3; j++)
    {
        inFile >> matrix[i][j];
        printf("\n%f\t%f\t%f", matrix[i][j]);
    }
}

like this..

[andyg55]

hmm, still aborts for some reason?

[Agni]

well i'm assuming that you have done the rest of the code correctly..... and if you can tell me the error it's throwing then i might help.. but as far as ur initial qs is concerned the proposed sol will work..

[VernonDozier]

Inside the Inner Loop

for (i=0; i < 3; i++){

  for (j = 0; j < 3; j++)
    {
        inFile >> matrix[i][j];
        printf("\n%f\t%f\t%f", matrix[i][j]);
    }
}

like this..

You changed the printf line from the original Andy. Above is chandra.rajat's revised code based on your revised code. Here was your original code:

for (i=0; i < 3; i++){
  for (j = 0; j < 3; j++)
    {
        inFile >> matrix[i][j];
    }
printf("%d\t", matrix[i][j]);

Originally you correctly had "%d", but you changed it to "%f" later. You want "%d" since the matrix array is integers. See top of below link for a listing of the correct specifiers for different data types. %f is for floats, %d for integers. Change it back to %d, along with chanra.rajat's suggestion and see if that works. You also stuck a bunch of extra "%f" specifiers in there. You just want one of them, and again you want "%d", not "%f". Use your original printf statement rather than the revised one, but stick it where chandra.rajat suggested.

http://www.cplusplus.com/reference/clibrary/cstdio/printf.html