WEEK1 | 1-3 |Starting to program| Data Types, Variables, and Constants

Computer, everything in Binary

Power of Binary

Power of Binary

 

Data Types, Variables, and Constants

• everything in a computer is represented in binary
• the data type of a variable or constant tells how to interpret the bits
• the data type of a variable or constant tells what we can do (the valid operations for the variable)

Memory

• we declare Variables to allocate memory for the
  • (=to get memory space for values we need to store)
  • providing the data type, and the variable name
  • optionally, providing a value
• we declare Constants to allocate memory for them
  • (=to get memory space for values we need to store)
  • providing the data type, and the constant name
  • necessarily, providing the value
• the value of a variable can change while running the program
• the value of a constant can’t change while running the program

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Integers

• 0, 42, -11
• class
  • byte : 8bits
  • short : 16bits
  • int : 32bits
  • long : 64bits
• not to waste memory, it is important to choose the appropriate class

 

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Input integer | “int.Parse()”

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Floating Point Numbers

• 1.912831631238…..
• Real Number
  • we don’t have infinite number of bits in a computer
  • we can’t represent the infinite set of real number
    • discrete domain
    • inaccuracy
• class
  • float : 32bits
  • double:  64bits

Integer, Float Calculation | Type Cast

 

Integer, Float Calculation | Type Cast

Attach scripts to gameObject

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Cosine “Math.Cos” | PI “Math.PI”

Float&Double | TypeCast

change to Degree | “*Math.PI/180”

Celsius&Fahrenheit | int variable

float variable | double variable

Rounding Error | Float | Double