#include "types.h"
#include <stdio.h>

#define ARRAY_LENGTH 5
#define MERGED_ARRAY_LENGTH 2 * ARRAY_LENGTH

int* ask_for_numbers(){
  static int p[ARRAY_LENGTH];
  for (int i = 0; i < ARRAY_LENGTH; ++i) {
    printf("Enter number (%d/%d):\n",i+1,ARRAY_LENGTH);
    scanf("%d",&p[i]);
  }
  return p;
}

void read_print_array_reverse() {
  //TODO 1. Read an array of numbers of length ARRAY_LENGTH from stdin.
  int* p = ask_for_numbers();

  //TODO 2. Print read array in reversed order to stdout.
  for (int i = ARRAY_LENGTH - 1; i >= 0; --i) {
    printf("%d ",p[i]);
  }
  return;
}

void read_print_array_max() {
  int* p = ask_for_numbers();

  //TODO 2. Find maximum value and print it to stdout.
  int max = p[0];
  for (int i = 1; i < ARRAY_LENGTH; ++i) {
    if(p[i] > max){
      max = p[i];
    }
  }

  printf("The max of the numbers entered is %d",max);
  return;
}

void read_print_array_avg() {
  //TODO 1. Read an array of numbers of length ARRAY_LENGTH from stdin.
  int* p = ask_for_numbers();

  //TODO 2. Calculate average value and print it to stdout.
  int all = 0;
  for (int i = 0; i < ARRAY_LENGTH; ++i) {
    all += p[i];
  }

  printf("The average value of the array is %.2f",(double)all/ARRAY_LENGTH);
  return;
}


void read_print_array_merge() {
  //TODO 1. Read 2 arrays of numbers, each of length ARRAY_LENGTH from stdin.
  printf("ARRAY 1\n");
  int* p = ask_for_numbers();

  printf("ARRAY 2\n");
  int* q = ask_for_numbers();

  //TODO 2. To 3rd array of length MERGED_ARRAY_LENGTH copy first and 
  //second arrays respectively and resulting third array print to stdout.
  int m[MERGED_ARRAY_LENGTH];
  for (int i = 0; i < MERGED_ARRAY_LENGTH; ++i) {
    if(i < ARRAY_LENGTH){
      m[i] = p[i];
    }
    else{
      m[i] = q[i-ARRAY_LENGTH];
    }
  }

  for (int i = 0; i < MERGED_ARRAY_LENGTH; ++i) {
    printf("%d ",m[i]);
  }
  printf("\n");
  return;
}


#ifndef TEST_BUILD

int main(int argc, char *argv[]) {
  printf("\n--read_print_array_reverse--\n");
  read_print_array_reverse();

  printf("\n--read_print_array_max--\n");
  read_print_array_max();
  
  printf("\n--read_print_array_avg--\n");
  read_print_array_avg();

  printf("\n--read_print_array_merge--\n");
  read_print_array_merge();

  return 0;
}

#endif