C Program to evaluate Subtraction of two matrices ( matrix ) in C

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

void main()
{
int i,j,a[10][10],b[10][10],c[10][10],m1,n1,m2,n2;

/* m - Number of rows
   n - Number of Columns */

clrscr();

printf("Enter the number of Rows of Mat1 : ");
scanf ("%d",&m1);

printf("Enter the number of Columns of Mat1 : ");
scanf ("%d",&n1);

/* Accept the Elements in m x n Matrix */

for( i = 0 ; i < m1 ; i++ )
    for( j = 0 ; j < n1 ; j++ )
    {
    printf("Enter the Element a[%d][%d] : ",i,j);
    scanf("%d",&a[i][j]);
    }

// ------------------------------------------

printf("nEnter the number of Rows of Mat2 : ");
scanf ("%d",&m2);

printf("nEnter the number of Columns of Mat2 : ");
scanf ("%d",&n2);

/* Before accepting the Elements Check if no of
   rows and columns of both matrices is equal */

if ( m1 != m2 || n1 != n2 )
 {
 printf("nOrder of two matrices is not same ");
 exit(0);
 }

 // ------ Terminate Program if Orders are unequal
 // ------ exit(0) : 0 for normal Termination

/* Accept the Elements in m x n Matrix */

for( i = 0 ; i < m2 ; i++ )
    for( j = 0 ; j < n2 ; j++ )
    {
    printf("Enter the Element b[%d][%d] : ",i,j);
    scanf("%d",&b[i][j]);
    }

// ------------------------------------------

/* Subtraction of two matrices */

for( i = 0 ; i < m1 ; i++ )
    for( j = 0 ; j < n1 ; j++ )
    {
    c[i][j] = a[i][j] - b[i][j] ;
    }

/* Print out the Resultant Matrix */

printf("nThe Subtraction of two Matrices is : n");

for( i = 0 ; i < m1 ; i++ )
 {
    for( j = 0 ; j < n1 ; j++ )
    {
    printf("%dt",c[i][j]);
    }
  printf("n");
 }

getch();

}

Output :

Enter the number of Rows of Mat1 : 3
Enter the number of Columns of Mat1 : 3

Enter the Element a[0][0] : 2
Enter the Element a[0][1] : 4
Enter the Element a[0][2] : 6
Enter the Element a[1][0] : 4
Enter the Element a[1][1] : 2
Enter the Element a[1][2] : 2
Enter the Element a[2][0] : 2
Enter the Element a[2][1] : 4
Enter the Element a[2][2] : 2

Enter the number of Rows of Mat2 : 3
Enter the number of Columns of Mat2 : 3

Enter the Element b[0][0] : 1
Enter the Element b[0][1] : 2
Enter the Element b[0][2] : 3
Enter the Element b[1][0] : 2
Enter the Element b[1][1] : 1
Enter the Element b[1][2] : 1
Enter the Element b[2][0] : 1
Enter the Element b[2][1] : 2
Enter the Element b[2][2] : 1

The Subtraction of two Matrices is :
1       2       3
2       1       1
1       2       1

Note : 2-D array needs two nested for loops
Keep in mind :

1. One Matrix can be subtracted with another only if the order of both matrices is Equal
2. No of rows of MAT-1 = No of rows of MAT-2
3. No of col of MAT-1 = No of col of MAT-2
4. During subtraction b[0][0] is subtracted from a[0][0] and result is stored in c[0][0]

We required two ‘for loops’ (nested) for following Perpose :

1. Accepting Matrix
2. Displaying Matrix
3. Manipulating Matrix
4. Performing Different Operations on Matrix