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Sequential Structures

Learn the basics of sequential logic and structures. Understand the order of execution, input data, and sequential statements. Explore how to create simple programs with sequential flow.

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Sequential Structures

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  1. Sequential Structures N201 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

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