Question

How to add two matrices (matrix) in C

Answer 1

#include <stdio.h>

int main(int argc, char **argv)
{
    int matrix1[][4] = { { 1, 1, 1, 1 }, { 2, 2, 2, 2 }, { 3, 3, 3, 3 } };
    int matrix2[][4] = { { 4, 4, 4, 4 }, { 5, 5, 5, 5 }, { 6, 6, 6, 6 } };
    int sum[][4]     = { { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } };
 
    int rows = sizeof(matrix1) / sizeof(matrix1[0]);
    int cols = sizeof(matrix1[0]) / sizeof(matrix1[0][0]);
 
    for (int i = 0; i < rows; i++)
        for (int j = 0; j < cols; j++)
            sum[i][j] = matrix1[i][j] + matrix2[i][j];

    for (int i = 0; i < rows; i++)
    {
        for (int j = 0; j < cols; j++)
            printf("%2d", sum[i][j]);
        printf("\n");
    }
    
    return 0;
}
 
  
/*
run:
  
 5 5 5 5
 7 7 7 7
 9 9 9 9
  
*/

 

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