1 Sections 3.1 – 3.2a Basic Syntax and Semantics Fundamentals of Java: AP Computer Science Essentials, 4th Edition Lambert / Osborne.

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Presentation transcript:

1 Sections 3.1 – 3.2a Basic Syntax and Semantics Fundamentals of Java: AP Computer Science Essentials, 4th Edition Lambert / Osborne

Chapter Language Elements Programming and natural languages share three elements. – Vocabulary: Words and symbols – Syntax: Rules for combining statements. Use of operators, parentheses, etc. – Semantics: Rules for interpreting statements. Order of precedence

Chapter Language Elements (continued) Programming Vs. Natural Languages: Programming and natural languages have three differences. – Size: small vocabulary, simple syntax. – Rigidity: Syntax must be absolutely correct. – Literalness: Computers follow exact instructions. It is difficult to express complex ideas using limited syntax and semantics of programming languages.

Chapter Basic Java Syntax and Semantics Data Types: Primitive: numbers, characters, booleans Objects: scanners, strings, and more Syntax: Syntax differs for objects and primitive data. – Primitive: data types are combined in expressions with operators (addition, multiplication) – Objects: sent messages, must be instantiated before use

Chapter Basic Java Syntax and Semantics (continued) Numbers: Numeric data types: – Most programs input numeric data, perform calculations, output numeric results. – Java includes six numeric data types but we use two:

Chapter Basic Java Syntax and Semantics (continued) Literals: Literals are items in a program whose values do not change. – Restricted to primitive data types and strings. Examples of numeric literals

Chapter Basic Java Syntax and Semantics (continued) Variables and Their Declarations: Variables are items whose values can change during execution. Changing the value of a variable

Chapter Basic Java Syntax and Semantics (continued) Variables and Their Declarations (cont): Before using a variable, the program must declare its type. – Variable declaration statement – Type on left; variable name on right – Several variables and values can be in the same statement.

Chapter Basic Java Syntax and Semantics (continued) Variables and Their Declarations (cont): Instantiation creates objects. Constants are variables that, once initialized, cannot change.

Chapter 3 10