24-1

#include <stdio.h>
#include <stdlib.h>

int* transpose(int* arr, int len){
    static int offset = 0;
    if(offset == len - 1){
        return *(arr);
    }else{
        printf("offset = %d\n", offset);

        for (int i = 0; i < len - offset; i++){
            printf("%d <-> %d\n", *(arr + (offset)*len + i), *(arr + (len - i - 1)*len + (len - offset - 1)));
            int temp = *(arr + (offset)*len + i);
            *(arr + (offset)*len + i) = *(arr + (len - i - 1)*len + (len - offset - 1));
            *(arr + (len - i - 1)*len + (len - offset - 1)) = temp;
        }


        for (int i = 0; i < len; i++){
            for (int j = 0; j < len; j++){
                printf("%5d ", *(arr + i*len + j));
            }
            printf("\n");
        }
        offset++;
        return transpose(arr, len);
    }
}

int main()
{
    printf("Hello world!\n");


    int *initial;
    int n;

    printf("Enter n: ");
    scanf("%d", &n);

    initial = (int*)malloc(n * n * sizeof(int));

    for (int i = 0; i < n; i++){
        for (int j = 0; j< n; j++){
            printf("arr[%d][%d] = ", i, j);
            scanf("%d", (initial + i*n + j));
        }

    }

    for (int i = 0; i < n; i++){
         for (int j = 0; j < n; j++){
            printf("%5d ", *(initial + i*n + j));
         }
         printf("\n");
    }


    transpose(initial, n);

    return 0;
}