01-static-vs-dynamic-typed-languages.md

Lab: Static vs Dynamic Typed Languages

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1. Which of the following languages are statically typed?

   1. Java
   2. C
   3. C++
   4. Python

   Reveal

   A, B, C

2. Which of the following languages are dynamically typed?

   1. C++
   2. Python
   3. Javascript
   4. PHP

   Reveal

   B, C, D

3. Choose the correct statements...

   1. Type checking process occurs at compile time for static typed languages.
   2. Type checking process occurs at runtime for static typed languages.
   3. Type checking process occurs at compile time for runtime typed languages.
   4. Type checking process occurs at runtime for dynamic typed languages.

   Reveal

   A, D

4. In dynamic typing, a variable is allowed to change its data type...

   • Depends on the data type
   • True
   • False
   • Only if it is an integer

   Reveal

   True

5. In static typing, a variable is allowed to change its data type...

   • Depends on the data type
   • True
   • False
   • Only if it is an integer

   Reveal

   False

6. A sample go program is stored under /root/code/simple-project. Inspect it.
   What is the data type assigned to the variable called title?

   You can run this program from the integrated terminal like so

   cd simple-project
   go run main.go

   • float
   • int
   • string
   • Sir

   Reveal

   string

   Examine line 7 of the code.

       title := "Sir"

   Recall that when := is used to create a variable, the type of the new variable is inferred from what follows :=.
   "Sir" is a string constant, therefore the variable title will be of type string.