Practical-22

Write a program using UDF and pointers to add two matrices and to return the resultant matrix to the calling function.

Introduction

In this program, we will learn to write a program using UDF and pointers to add two matrices and to return the resultant matrix to the calling function.

Algorithm

1. Start

Code

Practical-22.c

#include <stdio.h>

/*creating UDF which is to be called to add two matrices*/

/*cell is the type of an element of a matrix; remember that each cell is a number. Since each cell is like a int, we declare cell as int*/

typedef int cell;

/*num_rows and num_cols are int variables, which are used to keep track of the number of rows and columns of the matrices respectively*/

void Add_Matrix(int num_rows, int num_cols, cell matrix1[num_rows][num_cols], cell matrix2[num_rows][num_cols], cell matrix3[num_rows][num_cols])
{
    int i, j;

    /*for each element in the matrix, it's sum is calculated and put into the resulting matrix */
    for (i = 0; i < num_rows; i++)
    for (j = 0; j < num_cols; j++)
        matrix3[i][j] = matrix1[i][j] + matrix2[i][j];
}

/*Main function, where program execution begins*/

void main()
{
    int num_rows, num_cols;

    /*reading the number of rows and columns of matrix 1 and matrix 2*/
    printf("Enter number of rows of matrices: ");
    scanf("%d", &num_rows);
    printf("Enter number of columns of matrices: ");
    scanf("%d", &num_cols);

    /* matrix 1, matrix 2 and matrix 3 are declared*/
    cell matrix1[num_rows][num_cols], matrix2[num_rows][num_cols], matrix3[num_rows][num_cols];

    /* taking elements of both the matrices from user*/
    for (int i = 0; i < num_rows; i++) {
      for (int j = 0; j < num_cols; j++) {
        printf("Enter matrix 1 elements: ");
        scanf("%d", &matrix1[i][j ]);
      }

    }

    for (int i = 0; i < num_rows; i++) {
      for (int j = 0; j < num_cols; j++) {
        printf("Enter matrix 2 elements: ");
        scanf("%d", &matrix2[i][j ]);
      }

    }

    /*calling the UDF to add the two matrices*/
    Add_Matrix(num_rows, num_cols, matrix1, matrix2, matrix3);

    /*printing the resultant matrix*/
    printf("Resultant matrix is: \n");
    for (int i = 0; i < num_rows; i++) {
      for (int j = 0; j < num_cols; j++) {
        printf("%d ", matrix3[i][j]);
      }
      printf("\n");
    }


}

Output

Enter number of rows of matrices: 2
Enter number of columns of matrices: 2
Enter matrix 1 elements: 1
Enter matrix 1 elements: 2
Enter matrix 1 elements: 3
Enter matrix 1 elements: 4
Enter matrix 2 elements: 5
Enter matrix 2 elements: 6
Enter matrix 2 elements: 7
Enter matrix 2 elements: 8
Resultant matrix is:
6 8
10 12