Summary Introductory Programming

A snapshot of the summary - Introductory Programming

• Week 0

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  Is it legal to declare multiple variables of the same type on one line? If so, how?

  Yes - 
  
  
  
  , , ..., ; 
• What is an assignment statement?

  A Java statement that stores a value into a variable's memory location
• Why will int x = 2.5; raise an error?

  Because x is declared an int variable = it can only store an int value (not a float)
• Can an int value be stored in a variable of a different data type?

  Yes - an int value can be stored in a variable of type double; a float variable can also accept an int
• Java has primitive data types and non primitive data types. What are the non primitive data types called? How many are there?

  Types that are not primitive are called object/reference types 
  
  3
  - strings
  - arrays
  - user defines classes
• How many bits does a short data type contain?

  16 bits
• How many bits does a float data type contain?

  32 bits
• What are the benefits of constraining the size of a variable?

  Optimising memory
• What is the syntax to declare/initialise multiple variables at once?

  
  
  
  
  <type> <name> = <value> , <name> = <value> ;
  
  -> note, you only need to declare the type once
• Which package do we import the Scanner from?

  
  
  
  
  import java.util.*;