A)  C++ ARRAYS

1)What gets printed? 
#include <iostream.h>
void fn( int q[], int c[] );
int main ( void )      
{ 
   int i, qa[]= {1, 1, 2, 2}, count[3] ={4, 4, 4}; 
   fn ( qa, count );
   for ( i = 0 ; i < 3; ++i )
	cout << count[i] << endl ;
   return 0;
}

void fn( int q[], int c[] )
{
  int i, j;
  for ( i = 0 ; i < 4 ; ++i )
    for ( j = 0; j < 3 ; ++j )
      if ( q[i] != j )
    	  c[j] -= 1;
}


2) What gets printed? 

#include 
#include 

void fn(int a1[]);
void swap(int & r1, int & r2);

int main ( void )      
{ 
  int i, qa[] = {7, 9, 6, 8}; 
  fn(qa);
  return 0;
}

void fn( int a1[] )
{
  int i, j, k;
  for ( i = 0 ; i < 3 ; ++i )
    for ( j = i + 1; j < 4 ; ++j )
      if ( a1[i] > a1[j] )
      {
         swap ( a[i], a[j] );
         for ( k = 0 ; k < 4 ; ++ k )
           cout << setw(3) << a[k];
         cout << endl;
         for ( k = 0 ; k < 4 ; ++ k )
           if ( k == j || k == i )
             cout << "---";
           else
             cout << "   ";
         cout << endl;
      }
}
 
void swap(int &r1, int &r2)
{ int tmp;    tmp = r1;    r1  = r2;    r2  = tmp; }


B) C++ CLASS


1) What gets printed? 

#include 

class Time
{
   public:
     void get_time(int h){ hr = h; }
     void diff(Time d){ cout << hr - d.hr << endl; }
   private:
     int hr;
};

int main ( void )      
{ 
  Time dawn, now;
  dawn.get_time(6);
  now.get_time(13);
  now.diff(dawn);
  return 0;
}


C)  C++ CONSTRUCTORS


1) Use the program above to answer the following questions. 
   a) Which is/are the:  default constructor(s)? 
                         type conversion constructor(s)?  
                         copy constructor(s)?  
   b) What gets printed? 
   c) What happens in main(), if 2nd ctor, is changed to a default 
      initializer? (e.g.  Book(int p = 0); )    

#include 
class Book
{
 public:
   Book(void){pg = 100;}
   Book(int p){pg = p;} 
   Book(Book &b){b.pg = pg; cout << "hi\n";}  
   void diff(Book bb){ cout << bb.pg - pg << endl; } 
 private:
   int pg;
};

int main ( void )      
{ 
  Book moby_dick, hamlet(300);
  Book sea_wolf(moby_dick);
  sea_wolf.diff(hamlet);
  return 0;
}


D)  C++ I/O STREAMS


a) If "dear_john" looks like this: 
  ---------------------------------------------------------
      DEAR JOHN
      I love C++ more than YOU !!
      Farewell
  ---------------------------------------------------------
   What does "dear_mom" look like after program is run?
b) What gets printed on the terminal screen?  
c) Why is the "  extern "C"  "  inserted in the program? 

extern "C"
{
  #include 
}
#include 
int main ( void )      
{ 
  char     ch;
  ifstream ifs("dear_john");
  ofstream ofs("dear_mom");
  while ( ifs.get(ch) )
  {
    if ( ch == 'J' || ch == 'H' )
      ofs.put('M');
    else 
      ofs.put(ch);
  }
  ofs << "The Real End...\n";
  cout << "The End...\n";
  return 0;
}

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