C++ Tutorial For Beginners

Hello guys! I hope you have been enjoying our blog? In Today's Article we are going to talk about C++ Programming. But  before We begin with this C++ Programming We need to Know what C++ Programming Is?

What is C++ Programming Is?

ANSWER BY Wikipedia:C++ is a general-purpose Programming Language.It has imperative, object-oriented and generic Programming features, while also providing facilities  for low-level memory manipulation.

INTRODUCTION TO C++ Programming

In the introduction section we are going to talk about:

1. Why do People Program?

2. What is C++ & OOP?

3. What do I need to program?

Now let's take them one after the other with some explanation.. 

1. Why do People Program?

Each person can have his own reason for programming but I can tell you that programming

is one of the best ways to gain a deep understanding of computers and computer

technology. Learning to program makes you understand why computers and computer

programs work the way they do. It also puts some sense into you about how hard it is to

create software.

2. What is C++ & OOP?

C++ is an extended version C. C was developed at Bell Labs, in 1978. The purpose was to

create a simple language (simpler than assembly & machine code...) which can be used on a

variety of platforms. Later in the early 1980's C was extended to C++ to create an object oriented

language. O(bject) O(riented) P(rogramming) is a style of programming in which

programs are made using Classes. A class id code in a file separate from the main program -

more on classes later. OOP in general & C++ in particular made it possible to handle the

complexity of graphical environments. (like windows, macintosh..)

3. What do I need to program?

Well, you need a computer and a compiler to start with but you also need some curiosity

and a lot of time. I guess(!?) you have a computer. You can find different compilers for free

from borlands website (Check 5.1). If you have the curiosity but lack in time read stuff at

lessons and detention hours. Read whenever you find time. Having a good C++ book (check

5.2) also helps a lot. (and is much better for your eyes) One thing not to forget: No tutorial,

book, program or course makes you a programmer in 5 days. YOU make yourself a

programmer. NO compiler writes an entire program for you, YOU write the program.

YOUR FIRST PROGRAM

1. Running a C++ Program

Read this part carefully: A C++ program must be compiled and linked before it can be

executed, or run, on the computer. A great lot of compilers do this automatically. So what is

a compiler? A compiler is a program that translates C++ code into machine language.

Machine language is the language consisting of 1s and 0s, and is the native language of a

computer. A typed C++ program is called the source-code, and the compiled code is called

the object code.

Before the object code can be executed, it must be linked to other pieces of code (e.g.

included libraries) used by the program. The compiled & linked program is called an

executable file. Finally, the program is executed by the system. It's output is displayed in a

window.

2. C++ Program Structure

All C++ programs contain statements (commands) that tell the computer what to do. Here is

an example of a simple C++ program:

We own you program */ #include int main() { cout<<"We own you"; // the first statement return(0); // the second statement }

If run the program. It should display :
We own you

The structure of a simple C++ program is:

/* Comments : Name, purpose of the program your name, date, etc. */ #include int main() { statements; // comments return(0); }

Now we will have a closer look on the structure:

3. Comments

Comments are used to explain the contents of a program for a human reader. The

computer ignores them. The symbols /* and */ are used for the beginning and end of a

comment for multi-line comments. // symbols are also used for commenting. All characters

on a line after the // symbol are considered to be comments and are ignored. Most newbies

think that commenting a program is a waste of time. They are wrong. Commenting is very

important because it makes the code understandable by other programmers and makes it

easier to improve a program or fix the bugs in it. You'll understand better after trying to

decipher a hundred pages of code you wrote a few months later.

4. Libraries

Look at the program above. Following the opening comment was the line:

#include

This line simply tells the computer that the iostream library is needed therefore it should

be included. A library is a collection of program code that can be included (and used) in a

program to perform a variety of tasks. iostream is a library - also called as a header file,

look at its extension - used to perform input/output (I/O) stream tasks. There are a lot of

non-commercial C++ libraries for various purposes written by good guys who spent more

than enough time in front of their computers. You can find them at code.box.sk. Also

references to all libraries used in the tutorials can be found on the net.

5. Functions

The next line in the program was:

int main()

Which is the header of the main function. Makes sense? No? A function is a set of statements that accomplish a task. A function header includes the return type of the function and the function name. As shown in the main() header, main returns an integer(int) through return(0). So all the functions that have an integer as the return type returns integers. Very clear. The statements in a function (in this case the main function) are enclosed in curly braces. The { and } symbols indicates the beginning and the end of statements. More on functions later.

6. Streams

What is a stream? In C++ input/output devices are called streams. cout (we used above)

is the c(onsole) out(put) stream, and the send (insertion) operator is used to send the data

"We own you" into the stream. In the first statement:

cout<<"We own you";

The words following the << operator are put in quotation marks(") to form a string.

When run, the string We own you is sent to the console output device. Yes, it is also called

the computer screen.

Important note: C++ is case sensitive. That means cout and Cout is not the same
thing.

7. Return

The second statement was:

return(0);

which causes the program to terminate sending the value 0 to the computer. The value "0"

indicates that the program terminated without error.

Note: The statements end with a semicolon (;). A semicolon in C++ indicate the end of a

statement.

3. DATA & NUMBER SYSTEMS

1. Decimals

The base 10 number system. Uses 10 digits: 0 to 9. Numbers raised to the zero power is

equal to one. For example: 5 to the power 0 = 1. Base ten equivalent of the number

2600 = 2 x (10 to the power 3) + 6 x (10 to the power 2)

33 = 3 x (10 to the power 1) + 3 x (10 to the power 0)

2. Binaries

The base 2 number system. Uses 2 digits : 0 and 1. Works the same as base 10 except we

multiply numbers by the powers of 2 instead. For example 110 is equal to 6 in base 10:

110 = 1 x (2 to the power 2) + 1 x (2 to the power 1) = 6(base10)

3. Hexadecimal

The base 16 number system. Uses 16 digits. 0 to 9 & "A" to "F". Works the same as base

10 & base two except the numbers are multiplied by the powers of 16 instead:

1B = 1 x (16 to the power 1) + 2(B) x (16 to the power of 0) = 30(base10)

4. EXERCISES

1. Running

Find & install a compiler, type the example program and run it. Pretty simple but be sure

the syntax is correct.

2. Typing

Make a program which displays your name without looking to this tutorial. Makes you

learn a lot better.

3. Converting

Convert these to decimals         : 110101, 001101, 10101110

Convert these to hexadecimals : 234, 324, 19394

Convert these to binaries          : 2F, 1B3, 234, 125

5. WHAT NOW?

1. Good programming related sites

Here are a few good sites about programming:

1. http://code.box.sk                       --> Very good content. Has message boards.
2. http://www.borland.com             --> Free, shareware & commercial compilers.
3. http://www.cprogramming.com   --> Some original tuts.
4. http://www.planet-source             --> One of the biggest code archive.

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