Sep 30, 2011

C Program to find the Multiplication of two matrices

C Program to find the Multiplication of two matrices. C Program 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
Read more about C Programming Language .


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#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];
   }
  }
 }
}
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