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

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

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)

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

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

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

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