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这是一个关于编程的问题，我可以帮助您回答。以下是一个示例代码：

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

void rotate_square(int **square, int size) {
    // transpose the square
    for (int i = 0; i < size; i++) {
        for (int j = i; j < size; j++) {
            int tmp = square[i][j];
            square[i][j] = square[j][i];
            square[j][i] = tmp;
        }
    }
    // reverse each row
    for (int i = 0; i < size; i++) {
        for (int j = 0; j < size / 2; j++) {
            int tmp = square[i][j];
            square[i][j] = square[i][size - 1 - j];
            square[i][size - 1 - j] = tmp;
        }
    }
}

void print_square(int **square, int size) {
    for (int i = 0; i < size; i++) {
        for (int j = 0; j < size; j++) {
            printf("%d ", square[i][j]);
        }
        printf("\n");
    }
}

void create_magic_square(int **square, int size) {
    int row = 0, col = size / 2;
    for (int i = 1; i <= size*size; i++) {
        square[row][col] = i;
        int next_row = row == 0 ? size - 1 : row - 1;
        int next_col = col == size - 1 ? 0 : col + 1;
        if (square[next_row][next_col]) {
            row = (row + 1) % size;
        } else {
            row = next_row;
            col = next_col;
        }
    }
}

int main() {
    int size;
    printf("Enter the size of the magic square (odd number): ");
    scanf("%d", &size);
    if (size % 2 == 0) {
        printf("Invalid size!\n");
        return 1;
    }
    int **square = (int**) malloc(size * sizeof(int*));
    for (int i = 0; i < size; i++) {
        square[i] = (int*) malloc(size * sizeof(int));
    }
    create_magic_square(square, size);
    printf("Original square:\n");
    print_square(square, size);
    printf("Rotated square:\n");
    rotate_square(square, size);
    print_square(square, size);
    for (int i = 0; i < size; i++) {
        free(square[i]);
    }
    free(square);
    return 0;
}

这个程序使用了二维数组来存储奇数阶幻方。程序会提示用户输入幻方的阶数，然后使用“魔术算法”来生成幻方。接下来，程序会输出原始幻方和向右旋转90度后的幻方。