TAILIEUCHUNG - Lecture Fundamentals of computing 1: Lecture 6 - Duy Tan University

Lecture Fundamentals of computing 1: Lecture 6 introduce the arrays. In this chapter, the following content will be discussed: Arrays, arrays as parameter, reference semantics, arrays for tallying. Inviting you refer. | Lecture Title: Arrays Fundamentals of Computing 1 Agenda Arrays Arrays as parameter Reference semantics Arrays for tallying ask them, how might the computer store "hi" using binary digits? (some kind of mapping; ASCII) Can we solve this problem? Consider the following program (input underlined): How many days' temperatures? 7 Day 1's high temp: 45 Day 2's high temp: 44 Day 3's high temp: 39 Day 4's high temp: 48 Day 5's high temp: 37 Day 6's high temp: 46 Day 7's high temp: 53 Average temp = 4 days were above average. Why the problem is hard We need each input value twice: to compute the average (a cumulative sum) to count how many were above average We could read each value into a variable. but we: don't know how many days are needed until the program runs don't know how many variables to declare We need a way to declare many variables in one step. Arrays array: object that stores many values of the same type. element: One value in an array. index: A 0-based integer to access an element from an array. index 0 1 2 3 4 5 6 7 8 9 value 12 49 -2 26 5 17 -6 84 72 3 element 0 element 4 element 9 Array declaration type[] name = new type[length]; Example: int[] numbers = new int[10]; index 0 1 2 3 4 5 6 7 8 9 value 0 0 0 0 0 0 0 0 0 0 Array declaration, cont. The length can be any integer expression. int x = 2 * 3 + 1; int[] data = new int[x % 5 + 2]; Each element initially gets a "zero-equivalent" value. Type Default value int 0 double boolean false String or other object null (means, "no object") Accessing elements name[index] // access name[index] = value; // modify Example: numbers[0] = 27; numbers[3] = -6; (numbers[0]); if (numbers[3] ask them, how might the computer store "hi" using binary digits? (some kind of mapping; ASCII) Can we solve this problem? Consider the following program (input underlined): How many days' temperatures? 7 Day 1's high temp: 45 Day 2's high temp: 44 Day 3's high temp: 39 Day 4's high temp: 48 Day 5's high temp: 37 Day 6's high temp: 46 Day 7's high temp: 53 Average temp = 4 days were above average. Why the problem is hard We need each input value twice: to compute the average (a cumulative sum) to count how many were above average We could read each value into a variable. but we: don't know how many days are needed until the program runs don't know how many variables to declare We need a way to declare many variables in one step. Arrays array: object that stores many values of the same type. element: One value in an array. index: A 0-based integer to .

• Kỹ thuật lập trình
• Fundamentals of computing
• Lecture Fundamentals of computing 1
• Java programming
• Reference semantics
• Arrays for tallying
• Arrays as parameter
• Mobile computing
• Wireless and mobile computing
• Services data
• Wireless communication
• Transmission fundamentals
• Mobile computing transmission fundamentals
• Developing programming skills
• Data type
• Conditional expression
• Computer vocabulary
• Installing Eclipse
• Basic Java programs
• Structured algorithms
• Data types
• Number primitive types
• Mixing types
• Console output
• Scanner class
• Common pitfalls
• Imported class
• Relational expressions
• If statements
• Switch statements
• Random question
• Random answer
• The String class
• Immutable string
• String comparison
• Java OOPs
• Method overloading
• Object Oriented Programming System
• Syntax of inheritance
• Types of inheritance
• Method overriding
• Abstract class
• Abstract method
• Extended interface
• Java Access Modifier
• Static keyword
• Final keyword
• Exception handing
• Multiple catch block
• Nested try statements
• File processing
• Methods of class file
• File paths
• Graphic User Interface
• Layout manager
• Mouse events
• Inner class
• Static inner class
• Anonymous inner class
• Discovering computers fundamentals
• Computers fundamentals
• Enterprise Computing
• Information systems in the enterprise
• Enterprise wide technologies
• Cloud computing
• Frequency period relationship
• Signals for conveying information
• Digital data transmission
• Programming in C++
• Lecture Programming in C++
• History of electronic computers
• Computing fundamentals
• Memory access
• Central processing unit