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Exam 6: More Conditionals and Loops

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Question 1

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Show the output that would occur from the following code, including proper spacing. for (j = 0; j < 5; j++) { for (k = 0; k < 5; k++) if (j!=k) System.out.print(' '); else System.out.print('*'); System.out.println( ); }

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*
*
*
*
*
The outer loop iterates from 0...

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Question 2

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A data verification loop is a loop that asks the user to input a value within a restricted range repeatedly until the user has input a value within the requested range. Write a data verification loop that that inputs an int value x within the range 0 and 100. Assume cs1.Keyboard has been imported.

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int x;
do {
System.out.println...

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Question 3

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The following nested loop structure will execute the inner most statement (x++) how many times? For (int j = 0; j < 100; j++) For (int k = 100; k > 0; k--) X++;

Rewrite the following nested if-else statement as an equivalent switch statement. if (letter == 'A' | | letter == 'a') System.out.println("Excellent"); else if (letter == 'B' | | letter == 'b') System.out.println("You can do better"); else if (letter == 'C' | | letter == 'c') System.out.println("Try harder"); else if (letter == 'D' | | letter == 'd') System.out.println("Try much harder"); else System.out.println("Try another major! ");

In Java, it is possible to create an infinite loop out of while and do loops, but not for-loops.

The following code has a syntax error immediately before the word else. What is the error and why does it arise? Fix the code so that this statement is a legal if-else statement. if (x < 0) ; x++; else x--;

Each case in a switch statement must terminate with a break statement.

It is possible to convert any type of loop (while, do, or for) into any other.

Write a set of code that outputs all of the int values between 1 and 100 with 5 values per line, and each of those 5 values spaced out equally. Use a single for-loop to solve this problem.

Consider the following paint method to answer the questions below: public void paint(Graphics page) { int x, y = 200; page.setColor(Color.blue) ; for (x = 100; x < 200; x += 20) page.fillRect(x, y, 10, y-x) ; } -The size of each rectangle (bar)

You might choose to use a switch statement instead of nested if-else statements if

Given the following switch statement where x is an int, answer the questions below switch (x) { case 3 : x += 1; case 4 : x += 2; case 5 : x += 3; case 6 : x++; case 7 : x += 2; case 8 : x--; case 9 : x++ } -The statement if (x < 0) y = x; else y = 0; can be rewritten using a conditional operator as

Given the following switch statement where x is an int, answer the questions below switch (x) { case 3 : x += 1; case 4 : x += 2; case 5 : x += 3; case 6 : x++; case 7 : x += 2; case 8 : x--; case 9 : x++ } -If x is currently equal to 3, what will the value of x be after the switch statement executes?

A continue statement

The following for-loop is odd in that the loop increment value changes during iterations of the loop. Determine the number of times the loop iterates and the final value of j after the loop terminates. int k = 0; for (j = 0; j < 20; j += k) k++;

Given that s is a String, what does the following loop do? For (int j = s.length( ) ; j > 0; j--) System.out.print(s.charAt(j-1) ) ;

Write some code that inputs a set of int values and computes its average. Ask the user first how many int values will be input. Make sure that your code cannot produce a division by zero error. Assume that cs1.Keyboard has been imported.

How many times will the following loop iterate? Int x = 10; Do { System.out.println(x) ; X--; } while (x > 0) ;

Consider the following paint method to answer the questions below: public void paint(Graphics page) { int x, y = 200; page.setColor(Color.blue) ; for (x = 100; x < 200; x += 20) page.fillRect(x, y, 10, y-x) ; } -This paint method will draw several bars (sort of like a bar graph) . How many bars will be displayed?

Write a paint method to draw out an American flag. The flag will comprise a blue square in the upper left corner and 13 red and white stripes, starting with red, and alternating. 6 of the 13 stripes appear to the right of the blue square and the last 7 stripes appear beneath the blue square extending as far right as the other stripes. Use a for-loop to draw the stripes. Do not try to draw any stars in the blue square.