Two matrices equal or not

Posted on Apr 26, 2020

C program to check whether two matrices are equal or not.

Two matrices are said to be equal if and only if they satisfy the following conditions:

Both the matrices should have the same number of rows and columns.

Both the matrices should have the same corresponding elements.

Program

#include<stdio.h>
#include<conio.h>
#define MAX 10

void read_matrix(int mat[MAX][MAX], int row, int col)
{
    int i, j;
    for(i=0;i<row;i++)
    {
        for(j=0;j<col;j++)
        {
            printf("Element [%d][%d]\t:",i,j);
            scanf("%d",&mat[i][j]);
        }
    }
}

void print_matrix(int mat[MAX][MAX], int row, int col)
{
    int i, j;
    for(i=0;i<row;i++)
    {
        for(j=0;j<col;j++)
        {
            printf("%d\t",mat[i][j]);
        }
        printf("\n");
    }
}

void equal(int mat1[MAX][MAX], int mat2[MAX][MAX], int row1, int col1)
{
    int i, j, flag;

    flag = 0;
    for(i=0;i<row1;i++)
    {
        for(j=0;j<col1;j++)
        {
            if(mat1[i][j] != mat2[i][j])
            {
                flag = 1;
                break;
            }
        }
    }

    if(flag == 0)
    {
        printf("\nMatrices are equal");
    }
    else
    {
        printf("\nMatrices are not equal");
    }
}

void main()
{
    int mat1[MAX][MAX], mat2[MAX][MAX];
    int row1, col1, row2, col2;

    printf("Enter the number of rows of first matrix\t:");
    scanf("%d",&row1);
    printf("Enter the number of columns of first matrix\t:");
    scanf("%d",&col1);

    printf("Enter the number of rows of second matrix\t:");
    scanf("%d",&row2);
    printf("Enter the number of columns of second matrix\t:");
    scanf("%d",&col2);

    if(row1==row2 && col1==col2)
    {
        printf("Enter the elements of the first matrix\n");
        read_matrix(mat1, row1, col1);
        printf("Enter the elements of the second matrix\n");
        read_matrix(mat2, row2, col2);

        printf("\nFirst matrix entered is\n");
        print_matrix(mat1, row1, col1);
        printf("\nSecond matrix entered is\n");
        print_matrix(mat2, row2, col2);

        equal(mat1, mat2, row1, col1);
    }
    else
    {
        printf("\nMatrices cannot be compared");
    }

    getch();
}

Output

********** Run1 ********** 

Enter the number of rows of first matrix        :2
Enter the number of columns of first matrix     :3
Enter the number of rows of second matrix       :3
Enter the number of columns of second matrix    :4

Matrices cannot be compared


********** Run2 ********** 

Enter the number of rows of first matrix        :2
Enter the number of columns of first matrix     :3
Enter the number of rows of second matrix       :2
Enter the number of columns of second matrix    :3
Enter the elements of the first matrix
Element [0][0]  :1
Element [0][1]  :2
Element [0][2]  :3
Element [1][0]  :4
Element [1][1]  :5
Element [1][2]  :6
Enter the elements of the second matrix
Element [0][0]  :1
Element [0][1]  :2
Element [0][2]  :3
Element [1][0]  :4
Element [1][1]  :5
Element [1][2]  :6

First matrix entered is
1       2       3
4       5       6

Second matrix entered is
1       2       3
4       5       6

Matrices are equal


********** Run3 ********** 

Enter the number of rows of first matrix        :2
Enter the number of columns of first matrix     :3
Enter the number of rows of second matrix       :2
Enter the number of columns of second matrix    :3
Enter the elements of the first matrix
Element [0][0]  :1
Element [0][1]  :2
Element [0][2]  :3
Element [1][0]  :4
Element [1][1]  :5
Element [1][2]  :6
Enter the elements of the second matrix
Element [0][0]  :1
Element [0][1]  :1
Element [0][2]  :3
Element [1][0]  :4
Element [1][1]  :5
Element [1][2]  :6

First matrix entered is
1       2       3
4       5       6

Second matrix entered is
1       1       3
4       5       6

Matrices are not equal