Program for addition of two matrices

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

Recommended: Please solve it on “PRACTICE” first, before moving on to the solution.

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).

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.

My Personal Notes

Recommended: Please solve it on “PRACTICE” first, before moving on to the solution.

C++

C

Java

Python3

C#

PHP

Recommended Posts: