Exam 6: Loops

When will the loop in the following code snippet stop? java.util.Scanner in = new java.util.Scanner(System.in); Double sum = 0; Int count = 0; System.out.print("Enter values, Q to quit: "); Do { Double value = in.nextDouble(); Sum = sum + value; Count++; System.out.print("Enter values, Q to quit: "); } While (in.hasNextDouble() && count < 100); I. When the user enters an integer II. When the user enters an alphabetic character III. After the user enters 100 numbers

What is the output of the code snippet given below? Int i = 0; While (i != 9) { System.out.println("" + i); I = i + 2; }

What does the following code snippet display? char ch1 = '\u0000'; Char ch2 = '\uffff'; For (int i = 0; i < 1000; i++) { If (i % 50 == 0) { System.out.println(); } System.out.print((char)(ch1 + Math.random() * (ch2 - ch1 + 1))); }

What is the output of this loop? Int i = 0; Boolean found; While (i < 20 && !found) { Int sum = i * 2 + i * 3; System.out.print(sum + " "); If (sum > 50) { Found = true; } I++; }

Which of the following loops will print the odd numbers between 0 and 20?

How many times does the following loop execute? Int i = 0; Boolean found = false; While (i < 100 && !found) { I++; System.out.print(i + " "); Int j = i * i; If ((i * i * i) % j == j) { Found = true; } }

Which statement about storyboards is true?

Which of the following is correct for simulating the toss of a pair of coins to get 0 (head) or 1 (tail) with different probabilities? (Assume Random generator = new Random();)

How many times does the following loop run? Int i = 0; Int j = 1; Do { System.out.println("" + i + ";" + j); I++; If (i % 2 == 0) { J--; } } While (j >= 1);

In the following code snippet, when does the execution of the program switch from the inner loop to the outer loop? Int i; Int j; For (i = 0; i <= 9; i++) { For (j = 1; j < 5; j++) { System.out.println("Hello"); If (j == 2) { J = 6; } } }

Assume the following variable has been declared and given a value as shown: Random rand = new Random(); Double number = rand.nextDouble () * 2 + 3; What are the smallest and largest values number may be assigned?

What is the output of this code snippet if the user enters the numbers 1 2 3 4 -1 5? double total = 0; Boolean hasValidNumber = true; Scanner in = new Scanner(System.in); While (in.hasNextDouble() && hasValidNumber) { Double input = in.nextDouble(); If (input < 0) { HasValidNumber = false; } Else { Total = total + input; } } System.out.println(total);

What is the outcome of the following code snippet? boolean val1 = true; Boolean val2 = false; While (val1) { If (val1) { System.out.println("Hello"); } Val1 = val2; }

What is the output of the code snippet given below? String s = "12345"; Int i = 1; While (i < 5) { System.out.print); I++; }

What are the values of i and j after the following code fragment runs? Int i = 60; Int j = 50; Int count = 0; While (count < 5) { I = i + i; I = i + 1; J = j - 1; J = j - j; Count++; } System.out.println("i=" + i + ", j=" + j);

Insert a statement that will correctly terminate this loop when the end of input is reached. boolean done = false; While (!done) { String input = in.next(); If (input.equalsIgnoreCase("Q")) { __________ } Else { Double x = Double.parseDouble(input); Data.add(x); } }

Which of the following conditions can be added to the code below so it will loop until the user enters "no" or "NO"? Scanner in = new Scanner (System.in); System.out.print ("Continue? "); String response = in.next(); While (/* put condition here */) { System.out.println ("Hello beautiful!"); System.out.print ("Continue? "); Response = in.next(); }

What will be the final output of the following code snippet when a user enters input values in the order 10, 20, 30, 40, 50, and -1? public static void main(String[] args) { Double sum = 0; Int count = 0; Double salary = 0; Double average = 0; Scanner reader = new Scanner(System.in); System.out.println("Enter salaries (-1 to stop): "); While (salary != -1) { Salary = reader.nextInt(); If (salary != -1) { Sum = sum + salary; Count++; } } If (count > 0) { Average = sum / count; System.out.println("The Average Salary: " + average); } Else { System.out.println ("No data!"); } Return 0; }

Which of the following loop(s) should be used when you need to ask a user to enter one data item and repeat the prompt if the data is invalid? I. for loop II. while loop III. do loop

How many times will the output line be printed in the following code snippet? for (int num2 = 1; num2 <= 3; num2++) { For (int num1 = 0; num1 <= 2; num1++) { System.out.println("" + num2 + " " + num1); } }