C Program to Calculate the Addition or Subtraction & Trace of 2 Matrices

#include < stdio.h>
void trace(int arr[][10], int m, int n);
 
void main()
{
    int array1[10][10], array2[10][10], arraysum[10][10],
    arraydiff[10][10];
    int i, j, m, n, option;
 
    printf("Enter the order of the matrix array1 and array2 \n" );
    scanf("%d %d" , &m, &n);
    printf("Enter the elements of matrix array1 \n" );
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            scanf("%d" , &array1[i][j]);
        }
    }
    printf("MATRIX array1 is \n" );
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            printf("%3d" , array1[i][j]);
        }
        printf("\n" );
    }
    printf("Enter the elements of matrix array2 \n" );
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            scanf("%d" , &array2[i][j]);
        }
    }
    printf("MATRIX array2 is \n" );
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            printf("%3d" , array2[i][j]);
        }
        printf("\n" );
    }
    printf("Enter your option: 1 for Addition and 2 for Subtraction \n" );
    scanf("%d" , &option);
    switch (option)
    {
    case 1:
        for (i = 0; i < m; i++)
        {
            for (j = 0; j < n; j++)
            {
                arraysum[i][j] = array1[i][j] + array2[i][j];
            }
        }
        printf("Sum matrix is \n" );
        for (i = 0; i < m; i++)
        {
            for (j = 0; j < n; j++)
            {
                printf("%3d" , arraysum[i][j]) ;
            }
            printf("\n" );
        }
        trace (arraysum, m, n);
        break;
    case 2:
        for (i = 0; i < m; i++)
        {
            for (j = 0; j < n; j++)
            {
                arraydiff[i][j] = array1[i][j] - array2[i][j];
            }
        }
        printf("Difference matrix is \n" );
        for (i = 0; i < m; i++)
        {
            for (j = 0; j < n; j++)
            {
                printf("%3d" , arraydiff[i][j]) ;
            }
            printf("\n" );
        }
        trace (arraydiff, m, n);
        break;
    }
 
}
/*  Function to find the trace of a given matrix and print it */
void trace (int arr[][10], int m, int n)
{
    int i, j, trace = 0;
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            if (i == j)
            {
                trace = trace + arr[i][j];
            }
        }
    }
    printf("Trace of the resultant matrix is = %d\n" , trace);
}

Output

 Enter the order of the matrix array1 and array2
 3   3 
Enter the elements of matrix array1
 2   3   4 
 7   8   9 
 5   6   8 
MATRIX array1 is
   2    3    4 
   7    8    9 
   5    6    8 
Enter the elements of matrix array2
 3   3   3 
 3   4   6 
 8   4   7 
MATRIX array2 is
   3    3    3 
   3    4    6 
   8    4    7 
Enter your option:  1   for  Addition and  2   for  Subtraction
 1 
Sum matrix is
   5    6    7 
  10   12   15 
  13   10   15 
Trace of the resultant matrix is =  32 
 
   
Enter the order of the matrix array1 and array2
 3   3 
Enter the elements of matrix array1
 10   20   30 
 15   18   20 
 12   14   16 
MATRIX array1 is
  10   20   30 
  15   18   20 
  12   14   16 
Enter the elements of matrix array2
 1   5   9 
 10   15   14 
 9   12   13 
MATRIX array2 is
   1    5    9 
  10   15   14 
   9   12   13 
Enter your option:  1   for  Addition and  2   for  Subtraction
 2 
Difference matrix is
   9   15   21 
   5    3    6 
   3    2    3 
Trace of the resultant matrix is =  15 

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