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This startup Cofounder and CEO teaches kids to code in Python. Listen to her education and business strategy in the latest episode: http://ow.ly/Q49D30fVkKi Find notes, links, and more at the podcast website: http://www.k12engineering.net/transcripts/ep50.html

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What are the difference between Keywords and Identifiers in C++ language?

In C++ language, Keywords and Identifiers both are tokens and have their own importance and meaning. Below we discuss some important feature and difference between these two tokens with respect to C++ language.

1. Keywords are the reserved words which have some meaning in itself and we cannot use these words for another purpose. But identifiers are the user defined words which are used for specific purpose in programming like declare a variable or function name. For example, int x=10, here int is a keyword because int have a reserved word for integer and x is a identifiers which is used as variable name. and 10 is a constant value.

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What are the difference between variables and Constants in C++ language?

A variable is a place to store a piece of information or data in the computer memory's which is further retrieved to use in any processing in the program. Every variable in computer program can be identified with the help of a variable name. The data stored in a variable cannot be static and can be changed during run time because it can not have a fixed value. But in case of a Constant, the value of it is fixed and cannot be changed during execution of the program.Its value is always fixed.

Below, we have discussed some important point of difference between variables and constants:

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if condition Statement in C++ programming

When we want to execute a program on base of some particular condition is known as conditional statements. So, C++ provides some statements for implementing selection control structure. In conditional statement the condition is checked first and after that the block of if condition is executed.

if statement: It is the basic conditional statement which have the single entry and single exit statement. If the condition of if statement is true the the block of the condition is executed.

Syntax of if statement:

if(condition)
{

Statement 1....n; // this block is executed if condition id true.
}

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Identifiers and Keywords in C++ Programming

As we know every word in any computer language are either an identifiers or a keywords. But in C++ we have some rules to declare an identifiers. But in case of keywords, we don't need to do any thing because keywords are already reserved and defined in compiler like struct, break, continue, int, float etc. We only need to declare identifier when going to write any C++ program. For example
let's have a line of code below:

int x=10; Here,
int is a keyword which is already reserved for integer.
x is a variable which is further an identifier in C++.
10 is a constant value which is stored in x.

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Advantages of using user defined functions in your C++ program

There are many different advantages of using user defined functions in a C++ program:

1. Functions makes possible top-down modular programming. In this types of programming, the high level logic of the overall problem is solved first while the details of each lower level functions is addressed later.
2. Functions reduce the complexity of the program by reducing the code.
3. Functions reduce the time to run a program as we say it is directly proportional to complexity.

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She wanted to get more K-12 students to talk directly with scientists and engineers, and so she started Skype a Scientist. Hear Sarah McAnulty talk about why she wants to connect students to STEM role models, even through the internet. Also hear how she does it on the side of researching squid biology. It's all in the latest episode! http://ow.ly/gCRY30fyNB8

Show notes, links, and transcripts will be available at the podcast website: http://www.k12engineering.net/transcripts/ep49.html

I'm looking for resources that teach Python from an objects first approach.

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Implementation of doubly linked list in c++:
In Singly Linked List (SLL), each node provides information about where the next node is. It has no knowledge about where the previous node is. For example, if we are at the ith node in the linked list currently, then to access the (i-1)th node or (i-2)th node, we have to traverse the list right from the first node. In addition, it is not possible to delete the ith node given only a pointer to the ith node. It is also not possible to insert a node before the ith node given only a pointer to the ith node. For handling such difficulties, we can use Doubly Linked List (DLLs) where each node contains two links, one to its predecessor and other to its successor.
In a doubly linked list, each node has two links fields to store information about the one to the next and also about the one ahead of the node. Hence, each node has knowledge of its successor and also its predecessor.
Each node of a Doubly Linked List has three fields in general but must have at least two linked list and one data part for storing information in it.
A Doubly Linked List may either be linear or circular and it may or may not contain a header node. Doubly Linked List are also known as two-way linked list.

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Pointer is a type of variable which further used to stores the address of another variable in a program. For example a float pointer variables are used to stores the address of float variable similarly integer pointer variables are used to store address of integer varaible.
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