Comp 1572, Winter 2002
Pencil-and-Paper Assignment 1
Assigned January 4, 2002
Due Wednesday, January 9, 2002

1.  This is problem 2.34 from Deitel and Deitel:
    What's wrong with the following statement? Provide the correct
    statement to accomplish what the programmer was probably
    trying to do.
        cout << ++( x + y );

2.  This is problem 2.39 from Deitel and Deitel:
    Find the error(s) in each of the following:
    a) For ( x = 100, x >= 1, x++ )
           cout << x << endl;
    b) The following code should print whether integer value is odd or even:
       switch ( value % 2 ) {
           case 0:
               cout << "Even integer" << endl;
           case 1:
               cout << "Odd integer" << endl;
       }
    c) The following code should output the odd integers from 19 to 1:
       for ( x = 19; x >= 1; x += 2 )
           cout << x << endl;
    d) The following code should output the even integers from 2 to 100:
           counter = 2;
           do {
               cout << counter << endl;
               counter += 2;
           } While ( counter < 100 );

3. How many Xs does this program segment print?  Try predicting using your
   understanding of the for loop.  You can check your answer on a computer
   so you know you're right.

       for (int x = 0; x < 10; x++)
           for (int y = 5; y > 0; y--)
              cout <<"X";

4. What value is printed by the code segment below?  First predict using
   your understanding of the for loop.  You can check your answer on a computer
   to make sure you're right.

   int ctr;
   for (ctr = 2; ctr < 10; ctr += 3)
    ;
   cout << ctr;

5. The following function is supposed to ask the user to type 1 or 2
   repeating the question until the user actually enters 1 or 2.  Then it
   should return the users's answer as the function's value.  But it
   doesn't work.  Correct the function, and if I were you, I'd be sure
   to test your result on the computer.  Either turn in a printout of
   the corrected function, or just give the line(s) that have changed with
   an explanation.

      int get_1_or_2( )
      {
          int answer = 0;
          While (answer < 1 && answer => 2)
          {
              cout << "Enter 1 for Yes, 2 for No";
              cin >>  answer;
          }
          return answer;
      }

6. What's wrong with the following program?  Fix it so that it behaves
   reasonably, explain what line(s) you changed and how. 

   #include <iostream.h>
  
   int main()
   {
       int x = 0:
       if( x = 1);
           cout<< " x equals 1";
       otherwise
           cout<< " x does not equal 1";
       return 0;
    }

7. The logic in this program is fine, but there are some syntax errors.
   Fix the errors so that the program runs.  Describe the changes.

   #include<iostream.h>

   int main()
   {
       unsigned int beer;

       cout >> "How many bottles do you have? ";
       cin << beer;
       while (beer > 0) {
           cout >> beer >> " bottles of beer on the wall, "
	     >> beer >> " bottles of beer >> endl";
           cout >> "Take one down, pass it around >> endl";
           beer--;
           cout >> beer >> " bottles of beer on the wall. >> endl";
       }
       return 0;
    }
  
8.  This is problem 3.28 from Deitel and Deitel:
    Write a function that returns the smallest of three double-precision,
    floating-point numbers.

9.  This is problem 3.18 from Deitel and Deitel
    Write a function integerPower( base, exponent ) that returns the value of
    base to the power exponent.  For example, integerPower( 3, 4 ) = 3 * 3 * 3 * 3.
    Assume that exponent is a positive, nonzero integer and that base is an integer.
    The function integerPower should use for or while to control the calculation.
    Do not use any math library functions.

10. Write a function IsLeapYear that takes an integer year and returns a bool.
    It should, of course, return true if the year is a leap year, and false
    otherwise.  You'll need to use the modulus operator % in this problem.
    FYI - leap years come every fourth year (years divisible by 4),
    except every century (e.g, 1800 or 1900), unless the century is divisible by
    400.