vb.net barcode maker You can see the results in Figure 2-13, where we learn the numbers from 1 to 100 sum to 5050 in Java

Encoder Data Matrix in Java You can see the results in Figure 2-13, where we learn the numbers from 1 to 100 sum to 5050

You can see the results in Figure 2-13, where we learn the numbers from 1 to 100 sum to 5050
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Test the for Loop
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The for loop is a great one, and the most essential of all the loops to know Give this exercise a try: set a variable named age to a person s age, then have your code display Happy Birthday! once for each year of the person s age
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Keep on Looping with the while Loop
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The while loop is like the for loop in many ways, but it is designed to simply keep looping while a condition is true:
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while (condition) { statements }
In other words, this loop keeps executing the statements in the loop s body while the loop s condition is true Here s an example In this case, we re going to use a while loop together with an array of students to locate a specific student An array is just like a collection of variables that you can index with a numerical index, and it s a handy construct to store multiple data elements In fact, because you can address the elements in an array with a numerical index, arrays are perfect for use with loops, because you can increment a numerical index with a loop Let s get to the code to see how this works In this case, we ll store the names of eight students, so we ll need to create an array that holds eight elements, which you do like this:
var students = new Array(8);
Now you re free to assign names to each element in the array You address a particular element in the array by giving the array s name (students) followed by the numerical index of the element you want to reach, inside square brackets (like students[5]) The numerical index for arrays starts at 0, so you can assign names to all the elements in the array like this:
var students = new Array(8); students[0] = "George"; students[1] = "Ed"; students[2] = "Stella";
Ajax: A Beginner s Guide
students[3] students[4] students[5] students[6] students[7] = = = = = "Ted"; "Liz"; "Cary"; "Nancy"; "Zack";
Okay, now say that you want to see where Nancy is in the students array You can do that with a while loop like this, where we keep looping until we find Nancy:
var loopIndex = 0; while(students[loopIndex] != "Nancy" && loopIndex < studentslength - 1){ loopIndex++; }
The expression studentslength returns the number of total elements in the array, so setting up the while loop this way makes it loop until loopIndex is incremented to studentslength 1, or 7, unless Nancy is found at an earlier index If, at the end of this while loop, the variable loopIndex is less than or equal to the index of the last element in the array (which is studentslength 1), then we found Nancy, and we can report that fact this way (in whilehtml):
<html> <head> <title>Using the while loop</title> <script language="javascript"> function display() { var loopIndex = 0, students = new Array(6); students[0] students[1] students[2] students[3] students[4] students[5] students[6] students[7] = = = = = = = = "George"; "Ed"; "Stella"; "Ted"; "Liz"; "Cary"; "Nancy"; "Zack";
while(students[loopIndex] != "Nancy" && loopIndex < studentslength - 1){ loopIndex++; }
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Getting to Know JavaScript
if(loopIndex <= studentslength - 1){ documentgetElementById('targetDiv')innerHTML = "I found Nancy at student location " + loopIndex; } else { documentgetElementById('targetDiv')innerHTML = "I did not find Nancy"; } } </script> </head> <body> <h1>Using the while loop</h1> <input type="button" onclick="display()" value="Click Here"> <div id="targetDiv"> </div> </body> </html>
NOTE
A shortcut was used to set up two variables here, loopIndex and the students array, which were declared like this, all in a single line: var loopIndex = 0, students = new Array(6);
And you can see the results in Figure 2-14, where we found Nancy at index 6 in the students array
Figure 2-14
whilehtml
Ajax: A Beginner s Guide
Which Browser Does the User Have
It can be very important for the Ajax programmer to know which browser the user has, because the browser is the way you communicate with the user, and different browsers have different capabilities (for example, Internet Explorer has a scrolling <marquee> element that Firefox doesn t have) You can use JavaScript in your Ajax-enabled web pages to determine which browser the user has To do that, you check the text string in the built-in navigator object s userAgent property (which you access in JavaScript as navigatoruserAgent) In JavaScript, text strings are actually objects with their own properties and methods, and to search a text string, you can use the string s indexOf method, which returns the index of a substring you re searching for in the main string (that is, the position the substring starts at in the main string, where the first character is character 0) If the substring is not found in the main string, indexOf will return a negative value So, for example, to see if the browser identification string held in navigatoruserAgent contains the text "Firefox" you could check the return value of the expression navigator userAgentindexOf("Firefox") if it s non-negative, the string navigatoruserAgent contains the word "Firefox" Besides the navigatoruserAgent string, there s also another string, navigatorappName, that this page, browserhtml, uses The navigtorappName string lets browserhtml make the first determination of the browser type if it holds "Netscape", you re dealing with Firefox (or Netscape Navigator), and if it holds "MSIE", you re dealing with Microsoft Internet Explorer Here s what browserhtml looks like (browserhtml):
<html> <head> <title> What browser do you do have </title> <script language="javascript"> var begin, end function display() { if(navigatorappName == "Netscape") { if(navigatoruserAgentindexOf("Firefox") > 0) { begin = navigatoruserAgentindexOf("Firefox") + "Firefox"length + 1; end = navigatoruserAgentlength; documentgetElementById("targetDiv")innerHTML = "You are using Firefox " + navigatoruserAgentsubstring(begin, end); } }
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