Matrix Multiplication

C Program For Matrix Multiplication

Source Code:


#include<stdio.h>
#include<conio.h>

void input(int[20][20],int,int);
void show(int[20][20],int,int);
void multiply(int[20][20],int,int,int[20][20],int,int,int[20][20]);

void main()
{
int a[20][20],b[20][20],m,n,p,q,c[20][20];
clrscr();
printf("enter num of rows and columns of a:");
scanf("%d,%d",&m,&n);
input(a,m,n);
printf("\nFirst matrix is:\n\n");
show(a,m,n);
printf("enter num of rows and columns of b:");
scanf("%d,%d",&p,&q);
input(b,p,q);
printf("\nSecond matrix is:\n\n");
show(b,p,q);
multiply(a,m,n,b,p,q,c);
printf ("\nMultimlied matrix is:\n\n");
show(c,m,q);
getch();
}
void input(int a[20][20],int m,int n)
{
 int i,j;
 for(i=0;i<=m-1;i++)
 {
  for(j=0;j<=n-1;j++)
  {
   printf("enter element:");
   scanf("%d",&a[i][j]);
  }
 }
}

void show(int a[20][20],int m,int n)
{
 int i,j;
 for(i=0;i<=m-1;i++)
 {
  for(j=0;j<=n-1;j++)
  {
   printf("%d ",a[i][j]);
  }
  printf("\n");
 }
}

void multiply(int a[20][20],int m,int n,int b[20][20],int p,int q,int c[20][20])
{
 int i,j,l;
 if(n==p)
 {
  for(i=0;i<=m-1;i++)
   {
   for(l=0;l<=q-1;l++)
    {
     c[i][l]=0;
     for(j=0;j<=n-1;j++)
      {
       c[i][l]=c[i][l]+a[i][j]*b[j][l];
      }

    }

   }

 }
else
 {
  printf("Matrix multiplication not valid !");
 }
}


OUTPUT 1:

enter num of rows and columns of a:3,3
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1

First matrix is:

1 1 1
1 1 1
1 1 1
enter num of rows and columns of b:3,3
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1
enter element:1

Second matrix is:

1 1 1
1 1 1
1 1 1

Multimlied matrix is:

3 3 3
3 3 3
3 3 3

OUTPUT 2 :

enter num of rows and columns of a:2,2
enter element:1                                                                 
enter element:1                                                                 
enter element:1                                                                 
enter element:1                                                                 
                                                                                
First matrix is:                                                                
                                                                                
1 1                                                                             
1 1                                                                             
enter num of rows and columns of b:3,2                                          
enter element:1                                                                 
enter element:1                                                                 
enter element:1                                                                 
enter element:1                                                                 
enter element:1                                                                 
enter element:1
                                                                                
Second matrix is:                                                               
                                                                                
1 1                                                                             
1 1                                                                             
1 1                                                                             
Matrix multiplication not valid !