This file has some practice questions that are similar to those you'll have 
on the second exam.


** On paper **

1. Keep track of the values variables get and functions that are running
given some code.
Examples

#include <iostream>
#include <cmath>
using namespace std;
void printLogarithm (double x) {
  if (x <= 0.0) {
    cout << "Positive numbers only, please." << endl;
    return;
  }
  double result = log (x);
  cout << "The log of x is " << result;
}
void countdown (int n) {
  if (n == 0) {
    cout << "Blastoff!" << endl;
  } else {
    cout << n << endl;
    countdown (n-1);
  }
}
int main ()
{
  countdown (3);
  return 0;
}
//---------------------------------
int i;
int val;
for(i=0;i<5;i++) {
  val = val * val;
  cout << i << "\t" << val << endl;
}
//----------------------------------
morefun.cpp
//----------------------------------
void printMultiples (int n)
{
  int i;
  for(i=1; i<= 4; i++) {
    cout << n*i << " ";
  }
  cout << endl;
}
int main() {
  int j;
  for(j=1; j <= 3; j++) {
    printMultiples(j);
  }
  return 0;
}
//-----------------------------


2. Some questions about algorithms.  Study the algorithms...  
* Use the algorithm to solve the problem, show your work.
* Algorithms to know: selection sort, binary/hexadecimal/decimal conversion,
  determining if a number is prime, caesar encryption/decryption

* Example: determine if each of the following numbers is prime; if it is 
  prime your work should demonstrate that it is prime.
  31, 33, 35, 37

* Example: convert 11001100 to hexadecimal and to decimal.

* Example: Encrypt the message "good" using a caesar cipher that shifts
  each letter by 4.  
  Decrypt the encoded message "qepq" using a caesar cipher that shifted 
  each letter by 23 to get the encoded message.  Your decoded message 
  will be a normal english word.

* Example: Show selection sort sorts the following list of numbers
    3, 1, 7, 2, 8, 0, 4




** On computer **

1. Create a program from scratch to do something relatively simple.
Examples
* Add up the multiples of 33 up to 1000 and print the result.
* Ask the user to type in 10 strings and count how many were 4 letter words.


2. Take a program that has some syntax error in it, and fix the syntax
error.
Examples
* exam2wordcount.cpp has several syntax errors.  
* exam2arrayExample.cpp also has several syntax errors.
* exam2caesarBetter.cpp also has several syntax errors.

3. Take a program that has some logical error in it, and fix the 
logical error.
Examples
* exam2caesar.cpp has a logical error.
* exam2triangle.cpp has a logical error.
* exam2multiples.cpp has a logical error.