C program to Implement Multi-Dimensional Array | with simple coding

In C programming, you can create multi-dimensional arrays, which are very useful. This lesson defines the most common types of multi-dimensional arrays and provides working code examples.
Multi-Dimensional Arrays
We have entered a new dimension. Or perhaps several! The only benefit (or drawback) is that we won't be leaving Earth; instead we will be adding complexity and depth to our arrays in C.
A multi-dimensional array is an array that has more than one dimension. It is an array of arrays; an array that has multiple levels. The simplest multi-dimensional array is the 2D array, or two-dimensional array. It's technically an array of arrays, as you will see in the code. A 2D array is also called a matrix, or a table of rows and columns.

  // write a program in c to implement Multi-Dimensional Array
  #include <stdio.h>
  #include <conio.h>
  int main()
  {
      int a[10][10], b[10][10], c[10][10];
      int c1, c2, ch, r1, r2,i,j;
  
      printf("Enter size of array\n");
      scanf("%d%d", &r1, &c1);
      printf("enter elements of array !:\n ");
      for (int i = 0; i < r1; i++)
      {
          for (int j = 0; j < c1; j++)
          {
  
              scanf("%d", &a[i][j]);
          }
      }
      printf("Enter size of array2 \n");
      scanf("%d%d", &r2, &c2);
      printf("enter elements of array !:\n");
      for ( i = 0; i < r2; i++)
      {
          for ( j = 0; j < c2; j++)
          {
              scanf("%d", &b[i][j]);
          }
      }
      printf(" press 1 for addition :\n");
      printf("press 2 for  multiplication:\n");
      scanf("%d", &ch);
      switch (ch)
      {
      case 1:
          if ((r1 == r2) && (c1 == c2))
          {
              for (int i = 0; i < r1; i++)
              {
                  for (int j = 0; j < c1; j++)
                  {
                      c[i][j] = a[i][j] + b[i][j];
                      printf("%d  ", c[i][j]);
                  }
                  printf("\n");
              }
              break;
          }
          else
          {
              printf(" Addition is not possible\n");
              break;
          }
      case 2:
          if (c1 == r2)
          {
              for (i = 0; i < r1; i++)
              {
                  for (int j = 0; j < c2; j++)
                  {
                      c[i][j] = 0;
                      for (int k = 0; k < c1; k++)
                      {
                          c[i][j] = c[i][j] + (a[i][k] * b[k][j]);
                      }
                          printf("%d\t", c[i][j]);
                  }
                      printf("\n");
              }
      
          }
          else
          {
              printf("Multiplication is not possible !\n");
              break;
          }
          default:
          printf("Invalid choice \n");
          break;
      }// switch ends
      getch();
  }

When the above program is executed, it produces following results --
OUTPUT NO:- 1

  Enter size of array
  3
  3
  enter elements of array !:
   1 2 3 4 5 6 7 8 9
  Enter size of array2 
  3
  3
  enter elements of array !:
  1 2 3 4 5 6 7 8 9
   press 1 for addition :
  press 2 for  multiplication:
  1
  2   4  6  
  8  10  12  
  14  16  18

OUTPUT NO:- 02

  Enter size of array
  3 3
  enter elements of array !:
   1 2 3 4 5 6 7 8 9
  Enter size of array2 
  3 3 
  enter elements of array !:
  1 2 3 4 5 6 7 8 9
   press 1 for addition :
  press 2 for  multiplication:
  2
  30      36      42
  66      81      96
  102     126     150