Subtract two matrices using pointers

Posted on Apr 12, 2020

C Program to subtract two matrices using pointer

Program

#include<stdio.h>
#include<conio.h>
#define MAX 50

void print_matrix(int mat[MAX][MAX], int rows, int cols);
void input_matrix(int mat[MAX][MAX], int rows, int cols);

void main()
{
	int mat1[MAX][MAX], mat2[MAX][MAX], sub[MAX][MAX];
    int rows, cols;
    int i, j;

    printf("Enter the number of rows in the matrix\t:");
    scanf("%d",&rows);

    printf("Enter the number of columns in the matrix\t:");
    scanf("%d",&cols);

    printf("\nEnter elements in the first matrix\n");
    input_matrix(mat1, rows, cols);

    printf("\nEnter elements in the second matrix\n");
    input_matrix(mat2, rows, cols);

    for(i=0;i<rows;i++)
    {
        for(j=0;j<cols;j++)
        {
            *(*(sub + i) + j) = *(*(mat1 + i) + j) - *(*(mat2 + i) + j);
        }
    }

    printf("\nFirst Matrix\n");
    print_matrix(mat1, rows, cols);

    printf("\nSecond Matrix\n");
    print_matrix(mat2, rows, cols);

    printf("\nSubtraction Matrix\n");
    print_matrix(sub, rows, cols);

    getch();
}

void input_matrix(int mat[MAX][MAX], int rows, int cols)
{
    int i, j;
    for(i=0;i<rows;i++)
    {
        for(j=0;j<cols;j++)
        {
            scanf("%d",(*(mat+i)+j));
        }
    }
}

void print_matrix(int mat[MAX][MAX], int rows, int cols)
{
    int i, j;
    for(i=0;i<rows;i++)
    {
        for(j=0;j<cols;j++)
        {
            printf("%3d ",*(*(mat+i)+j));
        }
        printf("\n");
    }
}

Output

Enter the number of rows in the matrix  :3
Enter the number of columns in the matrix       :3

Enter elements in the first matrix
12
23
34
45
56
67
78
89
90

Enter elements in the second matrix
90
89
78
67
56
45
34
23
12

First Matrix
 12  23  34
 45  56  67
 78  89  90

Second Matrix
 90  89  78
 67  56  45
 34  23  12

Subtraction Matrix
-78 -66 -44
-22   0  22
 44  66  78
 44  66  78

Explanation