/* Matrix Sum and Difference -  Program to find sum and difference of two matrices */

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

void  read(int  x[ ][10], int  nr, int  nc) ;
void  sumdiff(int  a[ ][10], int  b[ ][10], int  s[ ][10], int  d[ ][10], int  nr, int  nc) ;
void  show(int  y[ ][10], int  nr, int  nc) ;


void main()
{
    int  a[10][10], b[10][10], s[10][10], d[10][10], nra, nca, nrb, ncb ;
    clrscr();
    printf("Enter the number of rows and columns of first matrix: ");
    scanf("%d %d", &nra, &nca) ;
    printf("Enter the number of rows and columns of second matrix: ");
    scanf("%d %d", &nrb, &ncb) ;
    if(nra==nrb && nca==ncb)
        {
            printf("Enter elements of first matrix row-wise: \n") ;
            read(a,nra,nca) ;
            printf("Enter elements of second matrix row-wise: \n") ;
            read(b,nrb,ncb) ;
            sumdiff(a,b,s,d,nra,nca);
            printf("Result of matrix addition is: \n") ;
            show(s,nra,nca) ;
            printf("Result of matrix subtraction is: \n") ;
            show(d,nra,nca) ;
        }
    else
        printf("Matrix addition and subtraction not possible.");
    getch();
}

void  read(int  x[ ][10], int  nr, int  nc)
{
    int  r, c ;
    for(r=0 ; r<nr ; r++)
        for(c=0 ; c<nc ; c++)
            scanf("%d", &x[r][c]) ;
}

void  sumdiff(int  a[ ][10], int  b[ ][10], int  s[ ][10], int  d[ ][10], int  nr, int  nc)
{
    int  r, c ;
    for(r=0 ; r<nr ; r++)
        for(c=0 ; c<nc ; c++)
            {
                s[r][c]=a[r][c]+b[r][c] ;
                d[r][c]=a[r][c]-b[r][c] ;
            }
}

void  show(int  y[ ][10], int  nr, int  nc)
{
    int  r, c ;
    for(r=0 ; r<nr ; r++)
        {
            for(c=0 ; c<nc ; c++)
                printf("%d ", y[r][c]) ;
            printf("\n") ;
        }
}

/*
Output1:

Enter the number of rows and columns of first matrix: 2  2
Enter the number of rows and columns of second matrix: 2  2
Enter elements of first matrix:
2  4
5  7
Enter elements of second matrix:
1  2
4  3
Result of matrix addition is:
3 6
9 10
Result of matrix subtraction is:
1 2
1 4

Output2:
Enter the number of rows and columns of first matrix: 2  3
Enter the number of rows and columns of second matrix: 2  4
Matrix addition and subtraction not possible.
*/