Java Ch 4 Quiz

A relational operator is a programming construct that allows for comparisons to be made between two values. It evaluates the relationship between the values and returns a boolean result, either true or false, based on the comparison. Therefore, it is correct to say that a relational operator allows you to make comparisons in a program.

The expression (10 >= 5) evaluates to true because 10 is greater than or equal to 5. The expression ('B'

The operator || is the logical operator used for the OR operation. It returns true if either of the operands is true, and false if both operands are false. The answer "OR" is correct because it correctly identifies the logical operator represented by the symbol ||. The answers "or" and "Or" are also correct as they represent the same logical operator in different case formats.

With short-circuit evaluation, when the value of an entire expression is found, evaluation stops. This means that if a condition in the expression is already determined to be true or false, the evaluation of the remaining conditions is skipped. This is because the final result of the expression is already known and there is no need to continue evaluating the remaining conditions. This can improve the efficiency of the program by avoiding unnecessary evaluations.

When one control statement is located within another control statement, it is said to be "nested". This means that the inner control statement is contained within the outer control statement, creating a hierarchical structure. The inner control statement will only be executed if the conditions of both the outer and inner control statements are satisfied. This nesting of control statements allows for more complex and specific conditions to be evaluated and executed in a program.

An else statement must be paired with an if statement because it provides an alternative action to be executed if the condition in the if statement evaluates to false. The else statement is used to handle all other cases that are not covered by the if statement, ensuring that there is always a code block to be executed regardless of the condition's outcome.

An expression is sometimes referred to as a decision maker because it evaluates a condition and determines whether to execute the statement that follows it. If the condition is true, the expression will result in a value that allows the statement to be executed. However, if the condition is false, the expression will result in a different value that prevents the statement from being executed. Therefore, the expression acts as a decision maker in determining the flow of the program based on the condition being evaluated.

The == operator is not used to assign a value to a variable. It is used to compare two values and check if they are equal. The assignment operator (=) is used to assign a value to a variable.

The statement following an expression is sometimes called the "action" statement. This is because the statement represents the action or operation that should be performed based on the expression's result. It is the next step or instruction that should be executed in the program flow.

An if statement does not necessarily have to be followed by an else statement. In programming, an if statement is used to execute a block of code if a certain condition is true. However, it is not mandatory to have an else statement after an if statement. The else statement is used to specify a block of code to be executed if the condition in the if statement is false. Therefore, it is possible to have an if statement without an else statement.