///////////////////////////////////
//
// program_9 project
//
// created 10/5/21 by tj
// rev 0
//
///////////////////////////////////
//
// read in an 2 dimensional nxn array, rotate, and print
//
// input - nxn array from user
// output - original and rotated array
//
///////////////////////////////////

#include "mbed.h"
#include <stdio.h>                      // only needed when printing
#define N 5                             // required by Mbed limitations

// function prototypes
void get_ary(int size, int ary[][N]);
void print_ary(int size, const int ary[][N]);
void rotate_ary(int size, const int in_ary[][N], int out_ary[][N]);

int main(void){
    setbuf(stdout, NULL);  // disable buffering when printing

    // splash 
    printf("\n\nprogram_9\n");
    printf("Using Mbed OS version %d.%d.%d\n\n", 
            MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
    printf("Welcome to array rotation program\n\n");
    
    int input_ary[N][N];
    int output_ary[N][N];
    
    while(1){
        get_ary(N, input_ary);
        
        printf("The array you entered is:\n");
        print_ary(N, input_ary); 
        
        rotate_ary(N, input_ary, output_ary);   
        print_ary(N, output_ary); 


    }// end while
            
   return 0;
}// end main
    
void get_ary(int size, int ary[][N]){
    int i;
    int j;
    for(i = 0; i < size; i++){
        printf("please enter the values for row %i: ", i);
        for(j = 0; j < size; j++)
            scanf("%i", &ary[i][j]);
    }
    return;
}// end print_ary

void print_ary(int size, const int ary[][N]){
    int i;
    int j;
    for(i = 0; i < size; i++){
        for(j = 0; j < size; j++)
            printf("\t%i", ary[i][j]);
        printf("\n");
    }
    printf("\n");
    
    return;
}// end print_ary

void rotate_ary(int size, const int in_ary[][N], int out_ary[][N]){
    int i;
    int j;
    char dir;
    
    // no need to copy original, have a separate output
    
    printf("Would you like to rotate the array right (R) or left(L)? ");
    scanf(" %c", &dir);
    
    if((dir == 'r') || (dir == 'R'))
        for(i = 0; i < size; i++)
            for(j = 0; j < size; j++)
                out_ary[i][j] = in_ary[(size - 1) - j][i]; 
    else
        for(i = 0; i < size; i++)
            for(j = 0; j < size; j++)
                out_ary[i][j] = in_ary[j][(size - 1) - i];    
    
    return;
}// end rotate_ary