C Program to interchange diagonal elements of a matrix

#include <stdio.h>
#define MAX_ROWS 3
#define MAX_COLS 3

int main()
{
    int A[MAX_ROWS][MAX_COLS];
    int row, col, size, temp;
 
   
    printf("Enter elements in matrix of size %dx%d: \n", MAX_ROWS, MAX_COLS);
    for(row=0; row<MAX_ROWS; row++)
    {
        for(col=0; col<MAX_COLS; col++)
        {
            scanf("%d", &A[row][col]);
        }
    }

    size = (MAX_ROWS < MAX_COLS) ? MAX_ROWS : MAX_COLS;
 
   
    for(row=0; row<size; row++)
    {
        col = row;
 
        temp = A[row][col];
        A[row][col] = A[row][(size-col) - 1];
        A[row][(size-col) - 1] = temp;
    }
 
    printf("\nMatrix after diagonals interchanged: \n");
    for(row=0; row<MAX_ROWS; row++)
    {
        for(col=0; col<MAX_COLS; col++)
        {
            printf("%d ", A[row][col]);
        }
 
        printf("\n");
    }
 
    return 0;
}