Question

I posted this question earlier but realized that the code was not easy to test since it was just screenshots and not text so I am reposting it:

I'm very new at working with file streams, and I'm having trouble with a HW assignment I have to work on. For the assignment I have to read an input file named "MagicSquaresIn.txt" (included at the bottom) and I have to check whether they are normal, associative, and panmagic.

To check that I am reading the file correctly, I am using fscanf to populate an array in the program and then printf to make sure that the arrays match what is in the file, however my output is completely blank. Can someone tell me what I'm doing wrong with my code? Or if there is a better approach to working this problem out? I would appreciate any input. Thanks! Here is my code below:

#include <stdio.h>

#define MAX_SQUARESIZE 15

int magicSquare[MAX_SQUARESIZE][MAX_SQUARESIZE];

/*

void checkBasic(int[][MAX_SQUARESIZE], int);

int getMagicNumber(int);

void checkNormal(int[][MAX_SQUARESIZE], int, int);

void checkAssociative(int[][MAX_SQUARESIZE], int, int);

void checkPanMagic(int[][MAX_SQUARESIZE], int);

*/

int main()

{

FILE *filePtr; // MagicSquareIn.txt file pointer

if ((filePtr = fopen("MagicSquareIn.txt", "r")) == NULL)

{

printf("Error. The file could not be opened\n");

} /* end if */

else

{

int magicNumber;

int arraySize;

fscanf(filePtr, "%d", &arraySize);

//printf("file opened properly\n");

while(!feof(filePtr))

{

// Nested for loop reads from file to populate array

for (int rowNum = 0; rowNum < arraySize; rowNum++)

{

for (int colNum = 0; colNum < arraySize; colNum++)

{

fscanf(filePtr, "%d", &magicSquare[rowNum][colNum]);

} /* End for loop going through column numbers */

} /* End for loop going through row numbers */

// Nested for loop prints out the array

for (int rowNum = 0; rowNum < arraySize; rowNum++)

{

for (int colNum = 0; colNum < arraySize; colNum++)

{

printf("%d ", magicSquare[rowNum][colNum]);

} /* End for loop going through column numbers */

printf("\n");

} /* End for loop going through row numbers */

/*

printf("\n");

checkBasic(magicSquare, arraySize);

magicNumber = getMagicNumber(arraySize);

checkNormal(magicSquare, arraySize, magicNumber);

checkAssociative(magicSquare, arraySize, magicNumber);

checkPanMagic(magicSquare, arraySize);

*/

// ^^^^ This is all commented out because I'm just checking to see that the file

// is read properly

fscanf(filePtr, "%d", &arraySize);

} /* end while-loop going through file */

fclose(filePtr);

} /* end else */

return 0;

} /* end main function */

Below is the data from the .txt file I was using:

3
8 1 6
3 5 7
4 9 2

4
16 3 2 13
5 10 11 8
9 6 7 12
4 15 14 1

5
8 17 1 15 24
11 25 9 18 2
19 3 12 21 10
22 6 20 4 13
5 14 23 7 16

5
1 15 24 8 17
23 7 16 5 14
20 4 13 22 6
12 21 10 19 3
9 18 2 11 25

9
47   58   69   80   1   12   23   34   45
57   68   79   9   11   22   33   44   46
67   78   8   10   21   32   43   54   56
77   7   18   20   31   42   53   55   66
6   17   19   30   41   52   63   65   76
16   27   29   40   51   62   64   75   5
26   28   39   50   61   72   74   4   15
36   38   49   60   71   73   3   14   25
37   48   59   70   81   2   13   24   35

4
16 21 10 18
19 9 24 13
22 15 17 11
8 20 14 23

5
1 15 24 8 17
23 7 16 5 14
20 13 4 22 6
12 21 10 19 11
9 18 2 25 3

Answer 1

Sorry, I am not able to reproduce your issue.

I believe one of the issue could be giving the incorrect file name or path. But when I give incorrect input I get the following error message.

With correct input I tried running your code and I got the following output. [Used Visual Studio]

[Please comment and let me know if you still face the issue.]