/* Develop functions *
* a) To read a given matrix *
* b) To output a matrix *
* c) To compute the product of two matrices *
* *
* Use the above functions to read in two matrices A (MxN)*
* B (NxM), to compute the product of the two matrices, to*
* output the given matrices and the computed matrix in a *
* main function */

#include <stdio.h>
#include <conio.h>
#define MAXROWS 10
#define MAXCOLS 10

void main()
{
int A[MAXROWS][MAXCOLS], B[MAXROWS][MAXCOLS], C[MAXROWS][MAXCOLS];
int M, N;

/*Function declarations*/

void readMatrix(int arr[][MAXCOLS], int M, int N);
void printMatrix(int arr[][MAXCOLS], int M, int N);
void productMatrix(int A[][MAXCOLS], int B[][MAXCOLS], int C[][MAXCOLS],
int M, int N);

clrscr();

printf(“Enter the value of M and N\n”);
scanf(“%d %d”,&M, &N);
printf (“Enter matrix A\n”);
readMatrix(A,M,N);
printf(“Matrix A\n”);
printMatrix(A,M,N);

printf (“Enter matrix B\n”);
readMatrix(B,M,N);
printf(“Matrix B\n”);
printMatrix(B,M,N);

productMatrix(A,B,C, M,N);

printf (“The product matrix is\n”);
printMatrix(C,M,N);
}

/*Input matrix A*/
void readMatrix(int arr[][MAXCOLS], int M, int N)
{
int i, j;
for(i=0; i< M ; i++)
{
for ( j=0; j < N; j++)
{
scanf(“%d”,&arr[i][j]);
}
}
}
void printMatrix(int arr[][MAXCOLS], int M, int N)
{
int i, j;
for(i=0; i< M ; i++)
{
for ( j=0; j < N; j++)
{
printf(“%3d”,arr[i][j]);
}
printf(“\n”);
}
}

/* Multiplication of matrices */
void productMatrix(int A[][MAXCOLS], int B[][MAXCOLS], int C[][MAXCOLS],
int M, int N)
{
int i, j, k;
for(i=0; i< M ; i++)
{
for ( j=0; j < N; j++)
{
C[i][j] = 0 ;
for (k=0; k < N; k++)
{
C[i][j] = C[i][j] + A[i][k] * B[k][j];
}
}
}
}
/*———————————————
Output
Enter the value of M and N
3 3
Enter matrix A
1 1 1
2 2 2
3 3 3
Matrix A
1  1  1
2  2  2
3  3  3
Enter matrix B
1 2 3
4 5 6
7 8 9
Matrix B
1  2  3
4  5  6
7  8  9
The product matrix is
12 15 18
24 30 36
36 45 54
——————————–*/

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Tagged as: Develop functions, To compute the product of two matrices, To output a matrix, To read a given matrix