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Program for addition of two matrices
  • Difficulty Level : Basic
  • Last Updated : 23 Feb, 2021

The below program adds two square matrices of size 4*4, we can change N for different dimension. 

C++




// C++ program for addition
// of two matrices
#include <bits/stdc++.h>
using namespace std;
#define N 4
 
// This function adds A[][] and B[][], and stores
// the result in C[][]
void add(int A[][N], int B[][N], int C[][N])
{
    int i, j;
    for (i = 0; i < N; i++)
        for (j = 0; j < N; j++)
            C[i][j] = A[i][j] + B[i][j];
}
 
// Driver code
int main()
{
    int A[N][N] = { {1, 1, 1, 1},
                    {2, 2, 2, 2},
                    {3, 3, 3, 3},
                    {4, 4, 4, 4}};
 
    int B[N][N] = { {1, 1, 1, 1},
                    {2, 2, 2, 2},
                    {3, 3, 3, 3},
                    {4, 4, 4, 4}};
 
    int C[N][N]; // To store result
    int i, j;
    add(A, B, C);
 
    cout << "Result matrix is " << endl;
    for (i = 0; i < N; i++)
    {
        for (j = 0; j < N; j++)
        cout << C[i][j] << " ";
        cout << endl;
    }
 
    return 0;
}
 
// This code is contributed by rathbhupendra


C




#include <stdio.h>
#define N 4
 
// This function adds A[][] and B[][], and stores
// the result in C[][]
void add(int A[][N], int B[][N], int C[][N])
{
    int i, j;
    for (i = 0; i < N; i++)
        for (j = 0; j < N; j++)
            C[i][j] = A[i][j] + B[i][j];
}
 
int main()
{
    int A[N][N] = { {1, 1, 1, 1},
                    {2, 2, 2, 2},
                    {3, 3, 3, 3},
                    {4, 4, 4, 4}};
 
    int B[N][N] = { {1, 1, 1, 1},
                    {2, 2, 2, 2},
                    {3, 3, 3, 3},
                    {4, 4, 4, 4}};
 
    int C[N][N]; // To store result
    int i, j;
    add(A, B, C);
 
    printf("Result matrix is \n");
    for (i = 0; i < N; i++)
    {
        for (j = 0; j < N; j++)
           printf("%d ", C[i][j]);
        printf("\n");
    }
 
    return 0;
}


Java




// Java program for addition
// of two matrices
 
class GFG
{
    static final int N = 4;
     
    // This function adds A[][] and B[][], and stores
    // the result in C[][]
    static void add(int A[][], int B[][], int C[][])
    {
        int i, j;
        for (i = 0; i < N; i++)
            for (j = 0; j < N; j++)
                C[i][j] = A[i][j] + B[i][j];
    }
     
    // Driver code
    public static void main (String[] args)
    {
        int A[][] = { {1, 1, 1, 1},
                        {2, 2, 2, 2},
                        {3, 3, 3, 3},
                        {4, 4, 4, 4}};
     
        int B[][] = { {1, 1, 1, 1},
                        {2, 2, 2, 2},
                        {3, 3, 3, 3},
                        {4, 4, 4, 4}};
     
        // To store result
        int C[][] = new int[N][N];
        int i, j;
        add(A, B, C);
     
        System.out.print("Result matrix is \n");
        for (i = 0; i < N; i++)
        {
            for (j = 0; j < N; j++)
            System.out.print(C[i][j] + " ");
            System.out.print("\n");
        }
    }
}
 
// This code is contributed by Anant Agarwal.


Python3




# Python3 program for addition
# of two matrices
 
N = 4
  
# This function adds A[][]
# and B[][], and stores
# the result in C[][]
def add(A,B,C):
 
    for i in range(N):
        for j in range(N):
            C[i][j] = A[i][j] + B[i][j]
 
# driver code
A = [ [1, 1, 1, 1],
    [2, 2, 2, 2],
    [3, 3, 3, 3],
    [4, 4, 4, 4]]
  
B= [ [1, 1, 1, 1],
    [2, 2, 2, 2],
    [3, 3, 3, 3],
    [4, 4, 4, 4]]
  
C=A[:][:] # To store result
 
add(A, B, C)
  
print("Result matrix is")
for i in range(N):
    for j in range(N):
        print(C[i][j], " ", end='')
    print()
     
# This code is contributed
# by Anant Agarwal.


C#




// C# program for addition
// of two matrices
using System;
 
class GFG
{
    static int N = 4;
     
    // This function adds A[][] and B[][], and stores
    // the result in C[][]
    static void add(int[,] A, int [,]B, int [,]C)
    {
        int i, j;
        for (i = 0; i < N; i++)
            for (j = 0; j < N; j++)
                C[i,j] = A[i,j] + B[i,j];
    }
     
    // Driver code
    public static void Main ()
    {
        int [,]A = { {1, 1, 1, 1},
                        {2, 2, 2, 2},
                        {3, 3, 3, 3},
                        {4, 4, 4, 4}};
     
        int [,]B = { {1, 1, 1, 1},
                        {2, 2, 2, 2},
                        {3, 3, 3, 3},
                        {4, 4, 4, 4}};
     
        // To store result
        int [,]C = new int[N,N];
        int i, j;
        add(A, B, C);
     
    Console.WriteLine("Result matrix is ");
        for (i = 0; i < N; i++)
        {
            for (j = 0; j < N; j++)
            Console.Write(C[i,j] + " ");
            Console.WriteLine();
        }
    }
}
 
// This code is contributed by vt_m.


PHP




<?php
// This function adds A[][] and
// B[][], and stores the result in C[][]
function add(&$A, &$B, &$C)
{
    $N = 4;
    for ($i = 0; $i < $N; $i++)
        for ($j = 0; $j < $N; $j++)
            $C[$i][$j] = $A[$i][$j] +
                         $B[$i][$j];
}
 
// Driver code
$A = array(array(1, 1, 1, 1),
           array(2, 2, 2, 2),
           array(3, 3, 3, 3),
           array(4, 4, 4, 4));
 
$B = array(array(1, 1, 1, 1),
           array(2, 2, 2, 2),
           array(3, 3, 3, 3),
           array(4, 4, 4, 4));
 
$N = 4;
add($A, $B, $C);
 
echo "Result matrix is \n";
for ($i = 0; $i < $N; $i++)
{
    for ($j = 0; $j < $N; $j++)
    {
        echo $C[$i][$j];
        echo " ";
    }
    echo "\n" ;
}
 
// This code is contributed
// by Shivi_Aggarwal
?>


Output: 

Result matrix is
2 2 2 2
4 4 4 4
6 6 6 6
8 8 8 8

The program can be extended for rectangular matrices. The following post can be useful for extending this program. 
How to pass a 2D array as a parameter in C?
The time complexity of the above program is O(n2). 

The auxiliary space of the above problem is O(n2)
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

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