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We use the same BufferedReader as before to read the file Students. After reading the first line in the file, the while statement checks to see if the variable score has a value of null. The variable score will be null only if there was nothing in the file to read. As long as score is not null, the body of the while statement will execute it will parse, or interpret, as a fractional number, whatever the BufferedReader just read, and then it will read the next line in the file. The while statement syntax is very simple: while( <loop condition> ) <statement> Again, the statement can be a code block enclosed in curly braces. As long as the test condition remains true, the body of the while statement continues to execute. This is a very appropriate control structure when we do not know in advance how many times a code block must execute.
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do-while A variation of the while statement is the do-while. In the case of the do-while statement, the body of the loop executes before the code checks the loop condition. When a program must execute a block of code at least once, the do-while may be the best choice for controlling a loop. Here is code to use the do-while statement instead of the while statement for reading the file Students: BufferedReader in = new BufferedReader( new FileReader( "Students" ) ); String score; do { score = in.readLine(); total = total + Double.parseDouble( score ); } while( score != null ) At first glance, it looks like this version saves code. However, in this particular case, this code exposes us to danger. If the file should ever be empty, the first call to parseDouble will cause the program to fail with a run-time exception, because Double.parseDouble cannot parse a null value. In this application, we would do better to use the while instead of the do-while. This is the syntax of the do-while loop: do <loop body> while( <loop condition> ); The loop body can be, and usually is, a code block framed by curly braces. As long as the loop condition remains true, the loop body will execute again and again. The do-while structure is particularly appropriate when you require the loop body to execute at least once every time the program runs.
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switch The last control structure we will discuss here is the switch statement. Like the if statement, the switch statement allows your program to select certain statements to execute under certain conditions. The switch statement is more complex, and one can always use a series of if statements instead of a switch statement, but switch is very appropriate and readable for some programming problems. Suppose we have a group of students and want to assign them to different dorms depending upon whether they are freshmen, sophomores, juniors, or seniors. Let s assume that the variable yearInSchool is coded as an int, and is set to 1 for freshmen, 2 for sophomores, 3 for juniors, and 4 for seniors. We could then use this code to decide to which dorm each student should be assigned:
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switch( yearInSchool ) { case 1: System.out.println( "Oberlies Hall" ); break; case 2: System.out.println( "Kiriazides Hall" ); break; case 3: System.out.println( "Glisson Dorm" ); break; case 4: System.out.println( "Valk Hall" ); break; default: System.out.println( "illegal year" ); } If a student is a freshman, the student will be assigned to Oberlies Hall; if the student is a sophomore, the student will be assigned to Kiriazides Hall; etc. Notice the break statements. The break statement says to exit the switch statement. If the break statement is missing, the execution of the switch statement will fall through to the next case. Sometimes you will want that to happen, but certainly not always. Forgetting to insert the break statement appropriately is a common programming error. Here s an example using the switch statement to allow falling through from one condition to the next in a helpful way: switch( case case case case case case case case case case case case dayOfChristmas ) { 12: System.out.println( 11: System.out.println( 10: System.out.println( 9: System.out.println( 8: System.out.println( 7: System.out.println( 6: System.out.println( 5: System.out.println( 4: System.out.println( 3: System.out.println( 2: System.out.println( 1: System.out.println( break; default: System.out.println(
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"Twelve drummers drumming" ); "Eleven pipers piping" ); "Ten lords a-leaping" ); "Nine ladies dancing" ); "Eight maids a-milking" ); "Seven swans a-swimming" ); "Six geese a-laying" ); "Five golden rings" ); "Four calling birds" ); "Three French hens" ); "Two turtle doves" ); "And a partridge ... tree" ); " Day = " + dayOfChristmas );
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} Notice that in this example, the case statements proceed from highest to lowest, instead of the other way around. The cases can be ordered in any way that makes sense, even nonsequentially. The switch statement executes by taking the value of the integral expression inside the parentheses (assume that dayOfChristmas is an int). The switch statement then compares the value of the integral expression to each case value. When it finds a match, the code for that case begins to execute. In this example, the switch statement helps us write the lyrics for the song The Twelve Days of Christmas. For instance, if the dayOfChristmas equals 3, execution will begin at case 3 and continue until it encounters the break at the end of case 1. The one break statement is necessary to avoid executing the default error message. The result will be the lyrics for the third day of Christmas: Three French hens Two turtle doves And a partridge in a pear tree
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