### DataStructure Program to perform matrix addition and multiplicaton

#include <stdio.h>
#include <conio.h>
#define MAX 3
void create ( int [3][3] ) ;
void display ( int [3][3] ) ;
void matadd ( int [3][3], int [3][3], int [3][3] ) ;
void matmul ( int [3][3], int [3][3], int [3][3] ) ;
void transpose ( int [3][3], int [3][3] ) ;
void main( )
{
int mat1[3][3], mat2[3][3], mat3[3][3], mat4[3][3], mat5[3][3] ;
clrscr( ) ;
printf ( "\nEnter elements for first array: \n\n" ) ;
create ( mat1 ) ;
printf ( "\nEnter elements for second array: \n\n" ) ;
create ( mat2 ) ;
printf ( "\nFirst Array: \n" ) ;
display ( mat1 ) ;
printf ( "\nSecond Array:\n" ) ;
display ( mat2 ) ;
matadd ( mat1, mat2, mat3 ) ;
printf ( "\nAfter Addition: \n" ) ;
display ( mat3 ) ;
matmul ( mat1, mat2, mat4 ) ;
printf ( "\nAfter Multiplication: \n" ) ;
display ( mat4 ) ;
transpose ( mat1, mat5 ) ;
printf ( "\nTranspose of first matrix: \n" ) ;
display ( mat5 ) ;
getch( ) ;
}
/* creates matrix mat */
void create ( int mat[3][3] )
{
int i, j ;
for ( i = 0 ; i < MAX ; i++ )
{
for ( j = 0 ; j < MAX ; j++ )
{
printf ( "Enter the element: " ) ;
scanf ( "%d", &mat[i][j] ) ;
}
}
}
/* displays the contents of matrix */
void display ( int mat[3][3] )
{
int i, j ;
for ( i = 0 ; i < MAX ; i++ )
{
for ( j = 0 ; j < MAX ; j++ )
printf ( "%d\t", mat[i][j] ) ;
printf ( "\n" ) ;
}
}
/* adds two matrices m1 and m2 */
void matadd ( int m1[3][3], int m2[3][3], int m3[3][3] )
{
int i, j ;
for ( i = 0 ; i < MAX ; i++ )
{
for ( j = 0 ; j < MAX ; j++ )
m3[i][j] = m1[i][j] + m2[i][j] ;
}
}
/* multiplies two matrices m1 and m2 */
void matmul ( int m1[3][3], int m2[3][3], int m3[3][3] )
{
int i, j, k ;
for ( k = 0 ; k < MAX ; k++ )
{
for ( i = 0 ; i < MAX ; i++ )
{
m3[k][i] = 0 ;
for ( j = 0 ; j < MAX ; j++ )
m3[k][i] += m1[k][j] * m2[j][i] ;
}
}
}
/* obtains transpose of matrix m1 */
void transpose ( int m1[3][3], int m2[3][3] )
{
int i, j ;
for ( i = 0 ; i < MAX ; i++ )
{
for ( j = 0 ; j < MAX ; j++ )
m2[i][j] = m1[j][i] ;
}
}