Variables, data types , Constant(PHP, JavaScript, Java)

Question

I cant understand those parts. Its hard for me to set them in my mind. If someone can give me some example of them and some uses of them by some project or code( I need to know how they have been used in any project) it would be much appreciated.
Thanks in advance

Answer 1

Java:
DataTypes/
Primitive. Non-Primitive.
int. Arrays
boolean. Strings
float. Self. defined Objects
double. etc...
long
short
bye
char
q)
Is there a way to tell if a data type is non-primitive?
Yea, look at the capitol letters 😜. (is the first letter in caps?)
Constants are variables that cannot change in value once defined. Denoted with the keyword 'final'.
Ex/
final float PI = 3.14;
This is a constant. Now it is impossible to change its value.
Ex/
final float PI = 3.14;
PI = 3.1415; // ERROR
decimals:
double > float
Whole numbers:
long > int > short > byte
True or false:
boolean
Character:
char
Denoted ' '
Ex/
char a = 'a';
Bunch of characters:
String
Denoted " "
Ex/
String word = "hello";

Answer 2

Tnx for your effort, its very helpful, i really appreciate it but if someone post any code based on these it would be more helpful and bro you missed javascript and php with codes

Answer 3

And i want to know if string is anything inside quotes..