Exam 4: Conditionals and Loops

Suppose we want to condition an if statement on whether two String objects, referenced by stringOne and stringTwo, are the same. Which of the following is the correct way to achieve this?

The following snippet of code will not compile because the second part of the if statement needs to be on the second line. if(a < b) System.out.println("a is less than b");

Rewrite the following code fragment using a for loop instead of a while loop. int i = 0; while(i < 50) { System.out.println(i); i+=2; }

Which of the following logical operators has the highest precedence?

What is wrong with the following snippet of code? Rewrite it so it produces the correct output. if(a < b) if(a == c) System.out.println(“a < b and a == c”); else System.out.println(“a is not less than b”);

A while statement always executes its loop body at least once.

Write a code fragment that allows a user to continue inputting numbers until she enters a sentinel value of 0. Then print the sum of all the numbers she entered. You may assume that a Scanner object called input has already been created.

Which of the following best describes this code snippet? if (count != 400) System.out.println("Hello World!");

Let a and b be valid boolean expressions. Which of the following best describes the result of the expression a || b?

Rewrite the following for loop as a while loop. for(int i = 0; i < MAX; i++) //loop body

The Scanner object can be used to read text files.

A logical expression can be described by a ________________ that lists all possible combinations of values for the variables involved in an expression.

Write a short application that takes in a String from the user and prints it out backwards.

It is possible to implement a switch statement using if statements.

A Scanner object can use delimiters other than a space.

The relational operators should not be used to test the equality of objects.

Write a for loop to print the even numbers from 1 to 100 (inclusive).

The ___________________ statement causes current iteration of a loop to stop and the condition to be evaluated again, either stopping the loop or causing the next iteration.

Which of the following for loop headers will cause the body of the loop to be executed 10 times?

A _______________ loop always executes its loop body at least once.