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Final Exam
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95 What uniquely identifies each block of computer memory 96 What operator returns the remainder after dividing two numbers 97 What value is returned by a relational operator 98 How would you change the value of a bit 99 In the expression a == 10 || b == 20, what condition(s) must be met for this expression to be true 100 What is the normal flow of a Java application
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CHAPTER B
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Answers to Quizzes and Final Exam
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1
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1 A compiler is a program that translates a program written in a high-level programming language into bytecode or object code, depending on the language used to write the program 2 A high-level programming language contains English-like words used by programmers to instruct a computer to perform specific functionality 3 Machine language is the only language a computer understands Instructions written in machine language are written as a series of zeros and ones 4 The key difference between C and Java is that Java enables a programmer to define classes Classes cannot be defined in C
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Java Demystified
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5 The key difference between C++ and Java is that a Java program can run on different kinds of computers without having to be recompiled A C++ program must be recompiled to run on different kinds of computers 6 Bytecode is compiled Java code that can be executed on any computer that is running the Java Virtual Machine 7 The Java Virtual Machine is a program that interprets Java bytecode 8 The main() method in a Java application is the entry point into the application 9 No You can define a Java class without declaring an attribute as a member of the class 10 A Java application terminates after the last statement in the main() method executes
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2
1 A data type is a keyword a programmer uses to tell Java the kind of data that needs to be stored in memory 2 No Only variables of the same data type can be declared in the same statement 3 Casting is a way to temporarily convert a value from one data type to another in order to make it compatible with an operation 4 The best way to determine the proper data type for a variable is to decide the minimum and maximum values that need to be stored in memory and then find the data type whose range complements these values 5 A variable identifier is a name that you give a variable You use this name throughout your program to refer to the memory location that Java associates with the variable identifier 6 A memory address is a unique number that identifies a location in memory A variable identifier is a name the programmer uses to refer the corresponding memory location 7 The scope of a variable is defined by the code block within which the variable is declared A variable goes out of scope when the program leaves the code block within which the variable is declared 8 Precision is the number of digits that are accurate to the right of the decimal point
Answers to Quizzes and Final Exam
9 The integer assigned to the character in Unicode is stored in memory when a character is assigned to a char variable 10 No A float is single precision (seven significant digits to the right of the decimal), whereas double is double precision (15 significant digits to the right of the decimal)
3
1 A compound expression is an expression that is composed of two or more subexpressions 2 A unary operator is an operator that requires one operand 3 An operator tells Java to perform an operation using one or more values that are referred to as operands 4 Parentheses are placed around subexpressions that are to be evaluated before other subexpressions 5 Precedence defines the order in which Java performs operations in an expression 6 The modulus operator returns the remainder after dividing two numbers 7 If the increment or decrement operator is used in a compound expression, such as a = ++b, the position of the increment or decrement operator tells Java to increment/decrement a value either before the assignment operation or after the assignment If the increment/decrement operator is positioned before the variable, the value is incremented/decremented before the assignment If the increment/decrement operator is positioned after the variable (for example, a++), the value is incremented/decrement after the assignment 8 A relational operator compares two values and returns a Boolean value 9 A bitwise operator changes the value of a bit 10 The OR logical operator ( || ) compares the results of two expressions If either expression is true, then the OR logical operator returns a true value; otherwise, a false value is returned
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