### Sample C Program To Multiply Two Matrix.

C Program To Multiply Two 3 * 3 Matrix :

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

main()
{
int a[3][3], b[3][3], c[3][3];
int i, j, k;
clrscr();

printf(" Enter elements of first matrix\n ");
for( i = 0; i < 3; i++ )
{
for( j = 0; j < 3; j++ )
{
printf(" \n Enter a[%d] [%d] element: ", i, j);
scanf(" %d ", &a[i] [j] );
}
}

printf(" Enter elements of second matrix\n ");

for( i = 0; i < 3; i++ )
{
for( j = 0; j < 3; j++ )
{
printf(" \n Enter b[%d] [%d] element: ", i, j );
scanf(" %d ", &b[i][j]);
}
}

printf(" \n\n First matrix is\n\n ");
for( i = 0; i < 3; i++ )
{
for( j = 0; j < 3; j++ )
printf(" %2d ", a[i][j]);
printf(" \n ");
}

printf(" \n\nSecond matrix is\n ");

for( i = 0; i < 3; i++ )
{
for( j = 0; j < 3; j++ )
printf(" %2d ", b[i][j]);
printf(" \n ");
}

for( i = 0; i < 3; i++ )
{
for( j = 0; j < 3; j++ )
{
c[i][j] = 0;
for( k = 0; k < 3; k++ )
c[i][j] = c[i][j] + a[i][k] * b[k][j];
}
}

printf(" \n\n Multiplication of two matrices is\n ");

for( i = 0; i < 3; i++ )
{
for(j = 0; j < 3; j++ )
printf(" %2d ", c[i][j]);
printf(" \n ");
}

getch();
}

OUTPUT:

Enter a[0] [0] element: 26
Enter a[0] [1] element: 45
Enter a[0] [2] element: 94
Enter a[1] [0] element: 28
Enter a[1] [1] element: 91
Enter a[1] [2] element: 62
Enter a[2] [0] element: 83
Enter a[2] [1] element: 16
Enter a[2] [2] element: 69

Enter elements of second matrix

Enter b[0] [0] element: 29
Enter b[0] [1] element: 39
Enter b[0] [2] element: 32
Enter b[1] [0] element: 28
Enter b[1] [1] element: 73
Enter b[1] [2] element: 18
Enter b[2] [0] element: 73
Enter b[2] [1] element: 27
Enter b[2] [2] element: 93

First matrix is
26  45  94
28  91  62
83  16  69

Second matrix is
29  39  32
28  73  18
73  27  93

Multiplication of two matrices is
8876  6837  10384
7886  9409  8300
7892  6268  9361

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