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SUMMARY JAVA (OOP)

C

PYTHON (OOP)

JAVASCRIPT

Everything in Java is associated with “Class” and “Object”, along with “attributes” and “methods” Comment Variables

integer

primitive data types

float

character String

// This is a comment line /*This is a comment paragraph*/ byte short int age = 19, weight = 70; long float floatNum = 11.2; double doubleNum = 11.2; char a = ‘T’; String name = “John”; method: length(), toUpperCase(), toLowerCase(), indexOf(), concat(),charAt() int x = 10; String y = “20”; String z = x + y; //1020 a String

// This is a comment line short int long int

var a = 10; let b = 5;

float double long double char a = ‘T’; char name[10] = {“John”};

var a = 1.5;

char str[10]; str = “a string” //This wrong

var a = ‘T’; var a = “A string in JS”;

array

String[] car = {“Volvo”}; int[] myScore = {9,10,10,10,9};

boolean

boolean myBool = true;

Type Casting Other

Input

Output

Print

Operators Condition if…else statement switch…case

x == y; x > y; x short > char > int > long > float > double (int) a; declared a const: final + type of variables ex: final int a = 5; Scanner sc = new Scanner(System.in);

System.out.println(“abc”);

short hand if…else: int result = (a>b) ? 1 : 2; switch (a) { case 0: //Coding here break; case 1:

char arr[] = //This is a string int arr[] = Arrays can only have one type of variable bool a = true; bool a = 1;

(int) a; avoi(string); // string to int avof(string); // string to float declared a const: final + type of variables ex: final int a = 5; scanf(“%d”, &variable);

printf(“abc”);

let arr = [1,2,3,”a”, 4];

const a = 5;

print(“”)

innerHTML()

//Coding here break; default: //Coding here Loop

For

While do…while break; continue; CLASS

Classes

} a loop for a array String[] alphabet ={“a”,”b”,”c”}; for (String i : alphabet) { System.out.println(i); } xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx break to jump out of the loop continue to jump to the next iteration in the loop The name of class have to the same with the name of file. It should start with a Uppercase letter public: need a object to call static: don’t need a object to call public class Main() { }

Objects Attributes Methods

Attributes is variables of class Method is a group of(like Function) Constructors Constructor is a special method

that is used to initialize objects.

Modifiers

public static private

Math

Math.max(12,4); Math.min(12,4); Math.sqrt(); Math.abs(-4.8); Math.random(); //from [0.0 , 1.0)

#include

#include strchr(), strstr(), strtok(), strlen() strcat() – strncat() strcpy() – strncpy() strcmp() – strncmp() Pointers malloc, calloc, realloc...