CODEWITHSUNDEEP
c
Logan Cole
Logan Cole

Reputation: 1

Scanning numbers from a file into a two dimentional array

I am new to programming so I apologize if I mess up on anything.

So I am trying to scan a file with multiple lines of numbers and put them into a two dimensional array. I've tried looking at other questions relating to this and nothing has worked so far.

So I have tried using nested loops to scan the array and put the numbers inside but nothing seems to happen. Inside the txt file is as follows: 

0 7 9 4 0 0 8 0 4 5 0 1 
0 2 4 0 0 0 1 6 2 8 6 0 
0 1 1 1 1 0 8 5 6 8 0 7 
0 5 1 0 0 0 1 3 8 1 0 1
Every 12th number is a new line. 

#include <stdio.h>

#define BUF_SIZE 12
#define ROW 4
#define COL 12
void
barcodeArray(int barcode[ROW][COL])
{
  char buffer[BUF_SIZE];
  FILE* f = fopen("q5_input.txt","r");
  if(f == NULL)
  {
    printf("no such file.");
  }
  for(int k = 0; k < ROW; k++)
  {
    for(int j = 0; j < COL; j++)
    {
      fscanf(f, "%1d", &barcode[k][j]);
      printf("%ls", &barcode[k][j]);
    }
  }
  fclose(f);
}
int
main(void)
{
  int barcode[ROW][COL];
  barcodeArray;
}

The printf inside the for loops is just reading back the numbers as it inputs the numbers in the array. As the code is it compiles but does nothing.

Upvotes: 0

Views: 63

Answers (2)

hafiz031
hafiz031

Reputation: 2670

Try this way. I think using freopen() is easier and hassle free. It enables you to use same I/O functions that you use for console I/O operations.

#include <stdio.h>
#define BUF_SIZE 12
#define ROW 4
#define COL 12
void barcodeArray()
{
    int barcode[ROW][COL];//This can be declared inside the function.
    char buffer[BUF_SIZE];
    FILE* f=freopen("q5_input.txt","r",stdin);
    if(f == NULL)
    {
        printf("no such file.\n");
        return;
    }
    for(int k = 0; k < ROW; k++)
    {
        for(int j = 0; j < COL; j++)
        {
            scanf("%d",&barcode[k][j]);
            printf("%d ",barcode[k][j]);
        }
        printf("\n");
    }
    fclose(f);
}
int main(void)
{
    barcodeArray();
}

Additionally if you want to output it in a file you can do the following in the main function:

int main(void)
{
    freopen("out.txt","w",stdout);
    barcodeArray();
}

Upvotes: 1

CharlesRA
CharlesRA

Reputation: 395

You must call your function with argument barcodeArray(barcode);

Edit : If you are not sure of the size of the array you can take a look at dynamically allocated variables. This is an important part of C programming

Upvotes: 1

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