// ============================================
// Week 5: Functions (II) (p. 3)

void swap (int x, int y);
int main()
{
  int a = 10, b = 20;
  cout << a << " " << b << endl; 
  swap(a, b);
  cout << a << " " << b << endl; 
}	
void swap (int x, int y)
{
  int temp = x;
  x = y;
  y = temp;
}






// ============================================
// Week 5: Functions (II) (p. 6)

void shiftArray (int [], int);
int main()
{
  int num[5] = {1, 2, 3, 4, 5};
  shiftArray(num, 5);
  for (int i = 0; i < 5; i++)
    cout << num[i] << " ";
  return 0;
}
void shiftArray (int a[], int len)
{
  int temp = a[0];
  for (int i = 0; i < len - 1; i++)
    a[i] = a[i + 1];
  a[len - 1] = temp;
}






// ============================================
// Week 5: Functions (II) (p. 9)

void printArray (const int [5], int);
int main()
{
  int num[5] = {1, 2, 3, 4, 5};
  printArray(num, 5);	
  return 0;
}
void printArray (const int a[5], int len)
{
  for (int i = 0; i < len; i++)
    cout << a[i] << " ";
  cout << endl;
}






// ============================================
// Week 5: Functions (II) (p. 20)

#include <iostream>
using namespace std;

int myMax (int [], int);
int main () 
{
  int a[5] = {7, 2, 5, 8, 9};
  cout << myMax (a, 5);
  return 0;
}
int myMax (int a[], int len)
{
  int max = a[0];
  for (int i = 1; i < len; i++)
  {
    if (a[i] > max)
      max = a[i];
  }
  return max;
}







// ============================================
// Week 5: Functions (II) (p. 27)

// myMax.h
const int LEN = 5; 
int myMax (int [], int);
void print (int);

// myMax.cpp
#include <iostream>
using namespace std; 
int myMax (int a[], int len)
{
  int max = a[0];
  for (int i = 1; i < len; i++)
  {
    if (a[i] > max)
      max = a[i];
  }
  return max;
}
void print (int i)
{
  cout << i; 
}

// main.cpp
#include <iostream>
#include "myMax.h"
using namespace std;

int main () 
{
  int a[LEN] = {7, 2, 5, 8, 9};
  print (myMax (a, LEN));
  return 0;
}








// ============================================
// Week 5: Functions (II) (p. 31)

#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
  int rn = 0;
  for (int i = 0; i < 10; i++)
  {
    rn = rand();
    cout << rn << " ";
  }
	
  return 0;
}







// ============================================
// Week 5: Functions (II) (p. 33)

#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
  srand(0);
  int rn = 0;
  for (int i = 0; i < 10; i++)
  {
    rn = rand();
    cout << rn << " ";
  }
	
  return 0;
}






// ============================================
// Week 5: Functions (II) (p. 35)

// left
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

int main()
{
  srand(time(0)); // good
  int rn = 0;
  for (int i = 0; i < 10; i++)
  {
    rn = rand();
    cout << rn << " ";
  }
  return 0;
}

// right
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

int main()
{
  int rn = 0;
  for (int i = 0; i < 10; i++)
  {
    srand(time(0)); // bad
    rn = rand();
    cout << rn << " ";
  }
  return 0;
}