J16N · July 24, 2021 14:07
diff --git a/matrix.c b/matrix.c
 // Required headers
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>

 // prototypes
 int **get_matrix(char *, int *, int *);
 void free_matrix(int **, int);

 int main(int argc, char *argv[])
 {
    // Basic usage
    int rows = 0, cols = 0;
    int **matrix = get_matrix(
        "Enter the matrix. Hit CTRL+D to exit.\n"
        "Rows start at every newline.\n"
        "Columns are seperated by a space.\n",
        &rows, &cols
    );
    
    // Now you can perform all the matrix operations
    // like a 2D array. You can also pass this to a function.
    // For example:
    // Display all the elements in the matrix
    for (int i = 0; i < rows; ++i)
    {
        for (int j = 0; j < cols; ++j)
            printf("%d", matrix[i][j]);
        
        printf("\n");
    }
    
    // After you have completed all your matrix
    // opertions, make sure to free all the
    // allocated memory.
    free_matrix(matrix, rows);
    return 0;
 }

 int **get_matrix(char *label, int *row, int *col)
 {
    // Display label
    printf("%s", label);

    int **matrix = NULL;
    for (int c; (c = getc(stdin)) != EOF; ++(*row))
    {
        ungetc(c, stdin);
        matrix = realloc(matrix, (*row + 1) * sizeof(int *));
        *col = 0;
        // Loop through all the lines (rows)
        for (; (c = getc(stdin)) != '\n' && c != EOF; ++(*col))
        {
            ungetc(c, stdin);
            matrix[*row] = realloc(matrix[*row], (*col + 1) * sizeof(int));
            int pos = 0;
            // Loop through all the digits of the number and add them
            // to the matrix at i-th row and j-th column
            while ((c = getc(stdin)) != ' ' && c != '\n' && c != EOF)
            {
                if (c >= '0' && c <= '9')
                {
                    matrix[*row][*col] = pow(10, pos) * matrix[*row][*col] + (c - '0');
                    ++pos;
                }
            }
            // Return the accidentally read 
            // newline character to STDIN
            if (c == '\n') ungetc(c, stdin);
        }
    }
    return matrix;
 }

 void free_matrix(int **matrix, int row)
 {
    // Loop through all the pointers and free them
    for (int i = 0; i < row; ++i)
        free(matrix[i]);
    free(matrix);
 }
	// Required headers
	#include <stdio.h>
	#include <stdlib.h>
	#include <math.h>

	// prototypes
	int *get_matrix(char , int , int );
	void free_matrix(int **, int);

	int main(int argc, char *argv[])
	{
	// Basic usage
	int rows = 0, cols = 0;
	int **matrix = get_matrix(
	"Enter the matrix. Hit CTRL+D to exit.\n"
	"Rows start at every newline.\n"
	"Columns are seperated by a space.\n",
	&rows, &cols
	);

	// Now you can perform all the matrix operations
	// like a 2D array. You can also pass this to a function.
	// For example:
	// Display all the elements in the matrix
	for (int i = 0; i < rows; ++i)
	{
	for (int j = 0; j < cols; ++j)
	printf("%d", matrix[i][j]);

	printf("\n");
	}

	// After you have completed all your matrix
	// opertions, make sure to free all the
	// allocated memory.
	free_matrix(matrix, rows);
	return 0;
	}

	int *get_matrix(char label, int row, int col)
	{
	// Display label
	printf("%s", label);

	int **matrix = NULL;
	for (int c; (c = getc(stdin)) != EOF; ++(*row))
	{
	ungetc(c, stdin);
	matrix = realloc(matrix, (row + 1) sizeof(int *));
	*col = 0;
	// Loop through all the lines (rows)
	for (; (c = getc(stdin)) != '\n' && c != EOF; ++(*col))
	{
	ungetc(c, stdin);
	matrix[row] = realloc(matrix[row], (col + 1) sizeof(int));
	int pos = 0;
	// Loop through all the digits of the number and add them
	// to the matrix at i-th row and j-th column
	while ((c = getc(stdin)) != ' ' && c != '\n' && c != EOF)
	{
	if (c >= '0' && c <= '9')
	{
	matrix[row][col] = pow(10, pos) * matrix[row][col] + (c - '0');
	++pos;
	}
	}
	// Return the accidentally read
	// newline character to STDIN
	if (c == '\n') ungetc(c, stdin);
	}
	}
	return matrix;
	}

	void free_matrix(int **matrix, int row)
	{
	// Loop through all the pointers and free them
	for (int i = 0; i < row; ++i)
	free(matrix[i]);
	free(matrix);
	}