Exam 2: Using Data

Describe the error message that will be produced when the following code is compiled. public class SalesOct { public static void main(String[] args) { int salesAmt; System.out.print("October sales are $"); System.out.println(salesAmt); } }

public class EndValue { public static void main(String[] args) { int aByte = 940; System.out.print("The ending value is "+ aByte); } } When the above code is compiled, what error message will be generated and why?

char aCharacter = 2; int aNumber = '2'; In the above statements, what values will be output after a println() statement is executed? Why are the output results different for the two statements?

When you write programs that accept ____________________, there is a risk that the user will enter the wrong type of data.

Explain how you can override a unifying type imposed by Java.

What is the difference between the float data type and the double data type?

Primitive types serve as the building blocks for more complex data types, called ____ types.

Describe how to assign values based on the result of comparisons to Boolean variables.

Why is the following relational operator expression invalid? How could you rewrite the statement so that it is valid? boolean isGradePassing = (grade => 70);

The term ____ refers to the mathematical accuracy of a value.

How could you alter the following statement to display "Welcome" on one line and "back" on another line? System.out.println("Welcome back");

Even if a statement occupies multiple lines, the statement is not complete until the semicolon is reached.

A(n) ____________________ number contains decimal positions.

Describe three ways in which a constant differs from a variable.

A variable can hold more than one value at a time.

In Java, ____ is a built-in class that provides you with the means for storing and manipulating character strings.

The term parse means to break into component parts.

Write the statement to declare an uninitialized integer value for salesAmt.

MATCHING Match each term with the correct statement below. -A floating-point data type

MATCHING Match each term with the correct statement below. -The operator that is represented by an equal sign (=)