What is an Interface in Java? - tccicomputercoaching.com

Array in C++-tccicomputercoaching.com

Array is collection of more than one data at same location of same type.
Syntax:
data type name[size];
This will create memory of specified size -data.

For example, an array containing 4 integer values of type int called rn could be represented as:
int rn[4];

3

2

1

0

In array memory always start from 0.

Initializing arrays

By default, regular arrays of local scope (for example, those declared within a function) are left uninitialized. This means that none of its elements are set to any particular value; their contents are undetermined at the point the array is declared.

But the elements in an array can be explicitly initialized to specific values when it is declared, by enclosing those initial values in braces {}. For example:

	int marks[5] = { 16, 27, 77, 40, 81 };

Accessing the values of an array

marks[2] = 75;

EXAMPLE

#include <iostream>

using namespace std;

int MARKS[] = {16, 2, 77, 40, 12071};

int n, result=0;

int main ()

{

  for ( n=0 ; n<5 ; ++n )

  {

    result += foo[n];

  }

  cout << result;

  return 0;

}

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List in Python-tccicomputercoaching.com

The simplest data structure in Python and is used to store a list of values.

Lists are collections of items (strings, integers, or even other lists).

Each item in the list has an assigned index value.

Lists are enclosed in [ ]
Each item in a list is separated by a comma

Unlike strings, lists are mutable, which means they can be changed.

Examples:

emptyList = [ ]  

list1 = ['one, two, three, four, five']

numlist = [1, 3, 5, 7, 9]

mixlist = ['yellow', 'red', 'blue', 'green', 'black']

An empty list is created using just square brackets:

list = []

Methods in List:

Method	Description
Python List append()	Add Single Element to The List
Python List extend()	Add Elements of a List to Another List
Python List insert()	Inserts Element to The List
Python List remove()	Removes Element from the List
Python List index()	returns smallest index of element in list
Python List count()	returns occurrences of element in a list
Python List pop()	Removes Element at Given Index
Python List reverse()	Reverses a List
Python List sort()	sorts elements of a list
Python List copy()	Returns Shallow Copy of a List
Python List clear()	Removes all Items from the List
Python any()	Checks if any Element of an Iterable is True
Python all()	returns true when all elements in iterable is true
Python ascii()	Returns String Containing Printable Representation
Python bool()	Converts a Value to Boolean
Python enumerate()	Returns an Enumerate Object
Python filter()	constructs iterator from elements which are true
Python iter()	returns iterator for an object
Python list() Function	creates list in Python
Python len()	Returns Length of an Object
Python max()	returns largest element
Python min()	returns smallest element
Python map()	Applies Function and Returns a List
Python reversed()	returns reversed iterator of a sequence
Python slice()	creates a slice object specified by range()
Python sorted()	returns sorted list from a given iterable
Python sum()	Add items of an Iterable
Python zip()	Returns an Iterator of Tuples

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Which one is better for a beginner, C++ or Java?tccicomputercoaching.com

First start from C, then C++, then Java.

Even if you wish to have Java as your primary programming language you must give some time to C & C++, may be a month to C & then two months to C++, you'll have pretty good command over the basics of programming, then move towards Java.

Because Java gives you so many things pre-built in you will not get much of the basic to practice, so it won't be a healthier step to go with java directly.

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Static and Dynamic Typing-tccicomputercoaching.com

Data Types are always important in any programming Language .

Let us understand through an example:

If we write direct a=10;

There will be an error.

Because user has to inform compiler about data type of data before use them in code.

All most all Languages have this feature. Some are exceptional which don't require to declare data type before use.

Static" and "dynamic" are the types of "typing" that we shall see in the sections that follow.

Languages that have static typing or dynamic typing are said to be "static typed" or "dynamic typed".
What is static typing? And what’s dynamic typing?

Static Typing

Static typed programming languages are those in which variables need not be defined before they’re used. This implies that static typing has to do with the explicit declaration (or initialization) of variables before they’re employed. Java is an example of a static typed language; C and C++ are also static typed languages. Note that in C (and C++ also), variables can be cast into other types, but they don’t get converted; you just read them assuming they are another type.

Static typing does not imply that you have to declare all the variables first, before you use them;

/* C code */

static int num, sum; // explicit declaration
num = 5; // now use the variables
sum = 10;
sum = sum + num;

Dynamic Typing

Dynamic typed programming languages are those languages in which variables must necessarily be defined before they are used. This implies that dynamic typed languages do not require the explicit declaration of the variables before they’re used. Python is an example of a dynamic typed programming language, and so is PHP. Consider the following example:

/* Python code */

num = 10 // directly using the variable

A lot of people define static typing and dynamic typing with respect to the point at which the variable types are checked. Using this analogy, static typed languages are those in which type checking is done at compile-time, whereas dynamic typed languages are those in which type checking is done at run-time.

To learn more about Type- Checking

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