This document discusses various programming tools used to design algorithms, including flowcharts, pseudocode, and hierarchy charts. It provides examples of how to represent algorithms for calculating postage stamps needed and determining direction of NYC streets using flowcharts and pseudocode. Tips are given on flowcharts and pseudocode, such as that flowcharts clearly illustrate logic but are time-consuming, while pseudocode focuses on key tasks. Free online flowcharting software is also listed.
A Beginnerās Guide to Programming Logic, Introductory
Chapter 1
An Overview of Computers and
Programming
Objectives
In this chapter, you will learn about:
- Computer systems
- Simple program logic
- The steps involved in the program development cycle
- Pseudocode statements and flowchart symbols
- Using a sentinel value to end a program
- Programming and user environments
- The evolution of programming models
COURSE TECHNOLOGY
CENGAGE Learning
A Beginnerās Guide to Programming Logic, Introductory
Chapter 1
An Overview of Computers and
Programming
Objectives
In this chapter, you will learn about:
- Computer systems
- Simple program logic
- The steps involved in the program development cycle
- Pseudocode statements and flowchart symbols
- Using a sentinel value to end a program
- Programming and user environments
- The evolution of programming models
COURSE TECHNOLOGY
CENGAGE Learning
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3. Programming Tools
ā¢ Three tools are used to convert
algorithms into computer programs:
ā¢ Flowchart - Graphically depicts the logical
steps to carry out a task and shows how the
steps relate to each other.
ā¢ Pseudocode - Uses English-like phrases with
some Visual Basic terms to outline the
program.
3
4. Problem solving example
ā¢ How many stamps do you use when
mailing a letter?
ā¢ One rule of thumb is to use one stamp
for every five sheets of paper or fraction
thereof.
4
5. Algorithm
1. Request the number of sheets of paper;
call it Sheets. (input)
2. Divide Sheets by 5. (processing)
3. Round the quotient up to the next
highest whole number; call it Stamps.
(processing)
4. Reply with the number Stamps. (output)
5
11. Pseudocode example
Determine the proper number of stamps for a
letter
Read Sheets (input)
Set the number of stamps to Sheets / 5
(processing)
Round the number of stamps up to the next
whole number (processing)
Display the number of stamps (output)
11
12. Divide-and-conquer method
ā¢ Used in problem solving ā take a large
problem and break it into smaller
problems solving the small ones first
ā¢ Breaks a problem down into modules
12
13. Statement structures
ā¢ Sequence ā follow instructions from one line
to the next without skipping over any lines
ā¢ Decision - if the answer to a question is
āYesā then one group of instructions is
executed. If the answer is āNo,ā then another
is executed
ā¢ Looping ā a series of instructions are
executed over and over
13
17. Direction of Numbered NYC
Streets Algorithm
ā¢ Problem: Given a street number of a
one-way street in New York City, decide
the direction of the street, either
eastbound or westbound
ā¢ Discussion: in New York City even
numbered streets are Eastbound, odd
numbered streets are Westbound
17
19. Pseudocode
Program: Determine the direction of a numbered
NYC street
Get street
If street is even Then
Display Eastbound
Else
Display Westbound
End If
19
20. Class Average Algorithm
ā¢ Problem: Calculate and report the grade-point
average for a class
ā¢ Discussion: The average grade equals the
sum of all grades divided by the number of
students
Output: Average grade
Input: Student grades
Processing: Find the sum of the grades; count
the number of students; calculate average
20
22. Pseudocode
Program: Determine the average grade of a class
Initialize Counter and Sum to 0
Do While there are more data
Get the next Grade
Add the Grade to the Sum
Increment the Counter
Loop
Computer Average = Sum / Counter
Display Average
22
23. Tips and tricks of flowcharts
ā¢ Flowcharts are time-consuming to write and
difficult to update
ā¢ For this reason, professional programmers are
more likely to favor pseudocode and hierarchy
charts
ā¢ Because flowcharts so clearly illustrate the
logical flow of programming techniques, they
are a valuable tool in the education of
programmers
23
24. Tips and tricks of pseudocode
ā¢ There are many styles of pseudocode
ā¢ Some programmers use an outline form
ā¢ Some use a form that looks almost like a
programming language
ā¢ The pseudocode in the case studies of this text
focus on the primary tasks to be performed by
the program and leaves many of the routine
details to be completed during the coding
process
24
We need a loop to read and then add (accumulate) the grades for each student in the class. Inside the loop, we also need to total (count) the number of students in the class. See Figures 2.8 to 2.10.
grade = sum of grades / number of students.