Program for addition of two matrices

Given two N x M matrices. Find a N x M matrix as the sum of given matrices each value at the sum of values of corresponding elements of the given two matrices. 

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Approach: Below is the idea to solve the problem.

Iterate over every cell of matrix (i, j), add the corresponding values of the two matrices and store in a single matrix i.e. the resultant matrix.

Follow the below steps to Implement the idea:

• Initialize a resultant matrix res[N][M].
• Run a for loop for counter i as each row and in each iteration:
  • Run a for loop for counter j as each column and in each iteration:
    • Add values of the two matrices for index i, j and store in res[i][j].
• Return res.

Below is the Implementation of above approach.

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

Time complexity: O(n x m). 
Auxiliary space: O(n x m).  since n² extra space has been taken for storing results

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?