Write a program to reverse 2D array Elements in c

C Program to Reverse Elements in a 2D Array

To write a C program to reverse 2D array elements, we can use the following steps:

1. Declare a function to reverse a 2D array. This function should take the 2D array as a parameter and return a pointer to the reversed array.
2. In the reverse function, iterate over the rows of the 2D array in reverse order. For each row, swap the elements of the row using two temporary variables.
3. Return the pointer to the reversed array.
4. In the main function, declare a 2D array and initialize it with some values.
5. Call the reverse function to reverse the 2D array.
6. Print the contents of the reversed array.

C program to reverse 2D array elements:

#include <stdio.h>

void reverse_array(int array[][10], int rows, int columns) {
  for (int i = 0; i < rows / 2; i++) {
    for (int j = 0; j < columns; j++) {
      int temp = array[i][j];
      array[i][j] = array[rows - i - 1][j];
      array[rows - i - 1][j] = temp;
    }
  }
}

void print_array(int array[][10], int rows, int columns) {
  for (int i = 0; i < rows; i++) {
    for (int j = 0; j < columns; j++) {
      printf("%d ", array[i][j]);
    }
    printf("\n");
  }
}

int main() {
  int array[10][10];
  int rows, columns;

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  printf("Enter the number of columns: ");
  scanf("%d", &columns);

  for (int i = 0; i < rows; i++) {
    for (int j = 0; j < columns; j++) {
      printf("Enter element at row %d, column %d: ", i, j);
      scanf("%d", &array[i][j]);
    }
  }

  printf("Original array:\n");
  print_array(array, rows, columns);

  reverse_array(array, rows, columns);

  printf("Reversed array:\n");
  print_array(array, rows, columns);

  return 0;
}

Example output:

Enter the number of rows: 3
Enter the number of columns: 3

Enter element at row 0, column 0: 1
Enter element at row 0, column 1: 2
Enter element at row 0, column 2: 3
Enter element at row 1, column 0: 4
Enter element at row 1, column 1: 5
Enter element at row 1, column 2: 6
Enter element at row 2, column 0: 7
Enter element at row 2, column 1: 8
Enter element at row 2, column 2: 9

Original array:
1 2 3
4 5 6
7 8 9

Reversed array:
7 8 9
4 5 6
1 2 3