1. Sequential Structures
Introduction to Programming Concepts
Dept. of Computer and Information Science

2. Goals Understand why a sequence structure is used
How to create sequence structure

3. Sequential Logic
Early programs used sequential logic. That is, Step A happened before Step B. Step B happened before Step C, etc.
Sequential programs are easy to write, but lack flexibility. (decisions and loops)

4. Sequential Structures
A series of statements
Executed in order
No branching
A jump in the flow of execution

5. Sequential Structures
Start – where the program begins
Input – data to be used for the program
Step One, Step Two, etc. – the sequence of the program until it finishes
No deviation

6. Sequential Statements
Welcome Message
Ask for data
Input name, address, city, favorite color data
Output data
Write name, address, city, favorite color message

7. Sequential Structures
var strUserName = "";
// user's name, this is a STRING
var strUserCity = "";
// user's city, this is a STRING
var intNumLetters = 0;
// number of letters in user's first name, this is an INTEGER
var strMessage = ""
// output to the user, this is a STRING
strUserName = window.prompt("What is your name?");
//this is asking for the user's name
strUserCity = window.prompt("Where do you live?");
//this is asking what city does the user live in
strMessage = ("Hello, "); strMessage += (strUserName.toUpperCase());
//this puts the user's name into uppercase letters
strMessage += (". You live in ");
strMessage += (strUserCity.toUpperCase());
//this puts the user's city into uppercase letters
window.alert(strMessage);
//this is the message given to the user
intNumLetters = strUserName.length;
// output to the user
window.alert("There are " +intNumLetters+" letters in your first name.");
//this is a string method, it is counting the number of letters in the user's name
//this tells the user how many letters that user has in their name