Homework 1
UCR CS10: Introduction to Computer Science
Winter Quarter 2004, Lecturer: Kris Miller

Due Wednesday, January 14 before 8:00pm by web turnin.

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Note: Collaboration policy for this homework assignment

Collaboration on this homework is strongly ENCOURAGED. The homework is intended
for practice, not assessment -- most people who turn in decent work should get
most if not all points for this assignment. Forming study groups is strongly 
encouraged. You shouldn't simply copy answers from any source -- each other,
the book, the web, other books, previous solutions, etc. But you can certainly
discuss how to solve the problems, look over each others solutions and help
"debug" them, compare answers and redo problems if you determine your answer is
wrong, and most importantly, explain concepts related to the problems and
solutions.
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1. Self-test Exercise #1-22 (Chapter 1, #22)
2. Self-test Exercise #1-23
3. Self-test Exercise #1-24
4. Self-test Exercise #1-27

5. The following program has an error. What is the error? Which of the 3 main 
kinds of program errors is it? Rewrite the line containing the error so that 
the program works correctly.


// This program outputs the sum of two numbers entered by the user.

#include<iostream>
using namespace std;

int main()
{
   int num1, num2, sum;

   cout << "Enter an integer and press return\n";
   cin >> num1;

   cout << "Enter a second integer and press return\n";
   cin >> num2;

   num1 + num2 = sum;

   cout << num1 << " + " << num2 << " = " << sum << endl;

   return 0;
}

Hint: If you don't see the error, try compiling and running the program.


6. Self-test Exercise #2-2  (Chapter 2, #2)
7. Self-test Exersice #2-4
8. Self-test Exersice #2-5
9. Self-test Exersice #2-6

10. (a) Write an algorithm (in English) for the following problem definition.

Past experience of science and engineering students have shown that to be 
successful, the average student should spend between 3 and 4 hours per unit 
per week studying and attending lectures and labs. Design an algorithm that 
will calculate the range of hours a student should be studying per week based 
on the number of units they are currently taking.

So, if a student is taking 12 units, this algorithm should calculate that they
need to be spending between 36 and 48 hours per week studying and attending 
lectures and labs if they want to be successful.

    (b) Translate this algorithm into a C++ program.