C Program to Matrix addition and subtraction

/* Write a C program to read two matrices A (MxN) and B(MxN) and perform addition OR subtraction of A and B. Find the trace of the resultant matrix. Output the given matrix, their sum or Differences and the trace.*/

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

void main()
{
      int A[10][10], B[10][10], sumat[10][10], diffmat[10][10];
      int i, j, M,N, option;

      void trace (int arr[][10], int M, int N);

      clrscr();

      printf("Enter the order of the matrice A and B\n");
      scanf("%d %d", &M, &N);

      printf("Enter the elements of matrix A\n");
      for(i=0; i<M; i++)
      {
 for(j=0; j<N; j++)
 {
scanf("%d",&A[i][j]);
 }
      }

      printf("MATRIX A is\n");
      for(i=0; i<M; i++)
      {
for(j=0; j<N; j++)
{
  printf("%3d",A[i][j]);
}
printf("\n");
      }

      printf("Enter the elements of matrix B\n");
      for(i=0; i<M; i++)
      {
 for(j=0; j<N; j++)
 {
scanf("%d",&B[i][j]);
 }
      }

      printf("MATRIX B is\n");
      for(i=0; i<M; i++)
      {
for(j=0; j<N; j++)
{
  printf("%3d",B[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++)
  {
sumat[i][j] = A[i][j] + B[i][j];
  }
      }

      printf("Sum matrix is\n");
      for(i=0; i<M; i++)
      {
  for(j=0; j<N; j++)
  {
printf("%3d",sumat[i][j]) ;
  }
  printf("\n");
      }

      trace (sumat, M, N);
      break;

case 2:for(i=0; i<M; i++)
      {
  for(j=0; j<N; j++)
  {
diffmat[i][j] = A[i][j] - B[i][j];
  }
      }

      printf("Difference matrix is\n");
      for(i=0; i<M; i++)
      {
  for(j=0; j<N; j++)
  {
printf("%3d",diffmat[i][j]) ;
  }
  printf("\n");
      }

      trace (diffmat, M, N);
      break;
}

}    /* End of main() */

/*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);

}
/*-----------------------------------
Enter the order of the matrice A and B
2 2
Enter the elements of matrix A
1 1
2 2
MATRIX A is
  1  1
  2  2
Enter the elements of matrix B
3 3
4 4
MATRIX B is
  3  3
  4  4
Enter your option: 1 for Addition and 2 for Subtraction
1
Sum matrix is
  4  4
  6  6
Trace of the resultant matrix is = 10
---------------------------------------------*/