C program for addition of two matrices 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("nEnter the number of Rows of Mat1 : ");
scanf ("%d",&m1);

printf("nEnter 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]);
    }

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

/* Addition 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 Addition 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] : 1
Enter the Element a[0][1] : 2
Enter the Element a[0][2] : 3
Enter the Element a[1][0] : 2
Enter the Element a[1][1] : 1
Enter the Element a[1][2] : 1
Enter the Element a[2][0] : 1
Enter the Element a[2][1] : 2
Enter the Element a[2][2] : 1

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 Addition of two Matrices is :
2 4 6
4 2 2
2 4 2

Note : 2-D array needs two nested for loops

Keep in mind : 

1. One Matrix can be added 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 addition a[0][0] is added with b[0][0] and result is stored in c[0][0]

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

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