Answer to Question #174423 in C for Hanbun

Question

Write a function to add 2D array using pointer. Return the array using pointer. (call by value) 

Answer 1

#include <stdio.h>

#define ROWS 3
#define COLS 3

/* Function declaration to input and print two dimensional array */
void inputMatrix(int matrix[][COLS], int rows, int cols);
void printMatrix(int matrix[][COLS], int rows, int cols);



int main()
{
    int matrix[ROWS][COLS];
    int i, j;

    /* Input elements in matrix */
    printf("Enter elements in %dx%d matrix.\n", ROWS, COLS);
    inputMatrix(matrix, ROWS, COLS);


    /* Print elements in matrix */
    printf("Elements of %dx%d matrix.\n", ROWS, COLS);
    printMatrix(matrix, ROWS, COLS);


    return 0;
}




/**
* Function to take input in two dimensional array (matrix)
* from user.
*
* @matrix  2D array to store input.
* @rows    Total rows in 2D matrix.
* @cols    Total columns in 2D matrix.
*/
void inputMatrix(int matrix[][COLS], int rows, int cols)
{
    int i, j;


    for(i = 0; i < rows; i++)
    {
        for(j = 0; j < cols; j++)
        {
            // (*(matrix + i) + j is equivalent to &matrix[i][j]
            scanf("%d", (*(matrix + i) + j));
        }
    }
}



/**
* Function to display elements of two dimensional array (matrix)
* on console.
*
* @matrix  2D array to display as output.
* @rows    Total rows in 2D matrix.
* @cols    Total columns in 2D matrix.
*/
void printMatrix(int (*matrix)[COLS], int rows, int cols)
{
    int i, j;


    for (i = 0; i < rows; i++)
    {
        for (j = 0; j < cols; j++)
        {
            // *(*(matrix + i) + j) is equivalent to matrix[i][j]
            printf("%d ", *(*(matrix + i) + j));
        }

        printf("\n");
    }
}