C Program to Add Two Matrices using Array

Ex: Write a C program to add two matrices using array. How to write a C program to add two matrices using array. C program to add two matrices using array.

Input from user: 

Enter elements in 1st matrix of size 3x3: 
1 1 1
2 2 2
3 3 3

Enter elements in 2nd matrix of size 3x3:
4 4 4
3 3 3
2 2 2


Expected output:

Sum of matrices=
5 5 5
5 5 5
5 5 5

• Quick links:

1. What is array?
2. For loop

• Logic of matrix addition:

Matrix addition is done element wise. Means sum of matrices is defined by A+B= A↓ij + B↓ij.

  Step by Step logic of the given program:

1. Accept two matrices from user declare varible say arr1 and arr2(use 2 dimensional array to store elements).

2. Store elements one by one in arr1 using: 
for(row=0;row<size;row++)
    {
        for(col=0;col<size;col++)
        {
            scanf("%d", &arr1[row][col]);
        }
    }
Follow same these  steps for arr2.

3. add two matrices arr1+arr2 element wise using:
for(row=0;row<size;row++)
    {
        for(col=0;col<size;col++)

        {
          arr3[row][col] = arr1[row][col] + arr2[row][col];
        }
    }

4. Last print sum of two matrices means resultant matrix arr3.





  C program to add two matrices using array:

#include<stdio.h>
#define size 3 // size of the matrix

int main()
{

    int arr1[size][size]; // 1st matrix
int arr2[size][size]; // 2nd Matrix
int arr3[size][size]; // Resultant matrix


    int row, col;

/* input elements in first matrix*/
printf("Enter elements in 1st matrix of size 3x3:\n");

    for(row=0;row<size;row++)
{
for(col=0;col<size;col++)
{
scanf("%d", &arr1[row][col]);
}
}

/* input elements in second matrix */

    printf("\nEnter elements in 2nd matrix  of size 3x3: \n");

    for(row=0; row<size;row++)
{
for(col=0;col<size;col++)
{
scanf("%d", &arr2[row][col]);
}
}


    /* Add two matrices arr1 and arr2 and store result in matrix arr3*/
for(row=0;row<size;row++)
{
for(col=0;col<size;col++)

    {
  arr3[row][col] = arr1[row][col] + arr2[row][col];
}
}


 /* Print the value of resultant matrix arr3 */ 

    printf("\nSum of matrices = \n");

    for(row=0; row<size;row++)
{
for(col=0; col<size;col++)
{
printf("%d ",arr3[row][col]);
}
printf("\n");
}

    return 0;

}

Above program shows the following output: