Thread: trying to read from file of integers into 2D array

hello again ..
so i have this text file of integers :

Code:

3
1
-1
4
-9
2
2
4
2
3
6
2
21

and i want to read from that text file into 2d array , here is my code :

Code:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MaxRows 5
#define MaxCols 5



  
int main(void)
{
   int AugMatrix[MaxRows][MaxCols] ; // augmentation matrix
   int i,j;
   FILE *IntFile;
   int arr[7][7];
   
   
    IntFile= fopen("numbers.txt","r"); // read from file of integers
   
  
      if (IntFile == NULL) 
           {   
              printf("Error! Could not open file\n"); 
              exit(-1); // must include stdlib.h
              }
               
      printf("The Array: \n\n");
      
      for ( i=0; i<7; i++) // load matrix
      {
         printf("\t %d",AugMatrix[i]);
         for(j=0 ;j<7 ;j++)
         {
            
            printf("\n %d",AugMatrix[j]);
         }
            fclose(IntFile);
            printf("\n");
         }

  return 0;
  } // end of main
  

ps: i'm using JGrasp to compile and run this code
i want my output to look like this

The array :

1 -1 4 -9
2 2 4 2
3 6 2 21

any help would be appreciated as i have so much on this project i want to make sure it works at the beginning.

thank you !

We can definitely!

1. What output are you receiving when you run this program?
2. Why have you defined constant values MaxCols and MaxRows but never use them?
2a. Are those the max number of columns and rows for the output or the 2d array?
3. Is the first number the number of columns and rows in the output matrix?

Originally Posted by ButtahNBred

We can definitely!

1. What output are you receiving when you run this program?

the output i'm recieveing is this:

Code:

The Array: 
ÏϧÏ
ÏÏ§Ï         1420516048
ÏÏ§Ï 1420516048
ÏÏ§Ï 1420516068
ÏÏ§Ï 1420516088
ÏÏ§Ï 1420516108
ÏÏ§Ï 1420516128
ÏÏ§Ï 1420516148
ÏÏ§Ï 1420516168
ÏÏ§Ï         1420516068
ÏÏ§Ï 1420516048
ÏÏ§Ï 1420516068
ÏÏ§Ï 1420516088

ÏÏ§Ï 1420516108

2. Why have you defined constant values MaxCols and MaxRows but never use them?
actually , i used them in the beginning in the For loops instead of 7 , but then i changed my mind

2a. Are those the max number of columns and rows for the output or the 2d array?

yes they should be the max rows and cols for the 2D array in output

3. Is the first number the number of columns and rows in the output matrix?
well, this is complicated .. the first number in the file which is 3 should indicate how many equations i have
so 3 will be 3 equations and (n*(n+1)) integers are the contents of the array which is 12 integers in my case

Thank you

Your 2d array is not represented properly in the nested loop. You need to use both indexes, not one.