## Thursday, 17 January 2013

### Addition Of Two Matrices Using DMA [C Source Code]

Here is the source code in C that makes use of DMA function malloc() to dynamically allocate the memory for matrices and find their sum.
```#include <stdio.h>
#include <stdlib.h>

int main()
{
int **A, **B, **C, m, n, p, q, i, j;
printf("Enter the size of matrix A: ");
scanf("%d %d", &m, &n);

printf("Enter the size of matrix B: ");
scanf("%d %d", &p, &q);

if (m == p && n == q)
{
A = malloc(m * sizeof(int));
B = malloc(m * sizeof(int));
C = malloc(m * sizeof(int));

for (i = 0; i < m; i++)
{
A[i] = malloc(n * sizeof(int));
B[i] = malloc(n * sizeof(int));
C[i] = malloc(n * sizeof(int));
}

printf("Enter the matrix A:\n\n");
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
scanf("%d", &A[i][j]);
}
}

printf("Enter the matrix B:\n\n");
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
scanf("%d", &B[i][j]);
}
}

for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
C[i][j] = A[i][j] + B[i][j];
}
}

printf("The addition of two matrices is: \n\n");

for (i = 0; i < n; i++)
{
for (j = 0; j < m; j++)
{
printf("%d ", C[i][j]);
}
printf("\n");
}

for (i = 0; i < m; i++)
{
free(A[i]);
free(B[i]);
free(C[i]);
}
free(A);
free(B);
free(C);
}
else
{
printf("Matrix addition is not possible for given size\n\n");
}

return 0;
}
```

Below is a sample run along with the compilation step.

```samar@samar-Techgaun:~\$ gcc -Wall -o matrix_addn matrix_addn.c
Enter the size of matrix A: 2 2
Enter the size of matrix B: 2 2
Enter the matrix A:

1 2
3 4
Enter the matrix B:

4 3
2 1
The addition of two matrices is:

5 5
5 5
```