Ezechinwa:
hello Nairalanders, i greet you all.. i opened this interactive trend to share my knowledge on C++ ,

As they say, the best way to learn is to teach and get feedbacks as well, so i am more than happy and glad to learn new things too...

PART 1....

Apparatus :

1. a PC running on windows, mac etc

2. Compiler : there are lots of free tools online, but you can download this compiler below
( file size :12mb
filename :'"devcpp4980.exe" Search the file name on google then download it... or visit the link below

http://www.filewatcher.com/m/devcpp4980.exe.12627146-0.html

)


•Note, as beginners of cpp, i implore you to follow the about instructions before proceeding to the next phase.... thank you..


Part 3:

I intentionally skipped "part 2" , which mainly entails the installation and setting of the about file you probably must have installed... for now.... in other words am going to wait till i get a positive responds before explaining more about part 2"
.
.
.

Note:: pls am typing this with my mobile phone so bare with me... thank you... and your Encouragement n participation will go a very long way...

Drniyi4u:
ŋįçę ţђŗęād... ƒollowįŋg!!!

KazukiIto:
Hello OP, can you kindly post ur number? Just in case some of us needs a one-on-one chat with u. Thanks

Ezechinwa:
..... Part 3..... continues....

LET'S begin... relax... do not cram but practise,,, And Encourage me...

INTRODUCTION TO CPP...


As promised earlier, am going to skip unrelevant stuffs about CPP... but for reference sake you can read up the following online.. you can use "google.com"

1. history of cpp
2. important of learning cpp
3. why you require a compiler, functions of a compiler.. etc.

as i posted earlier the tools required, am now going to post the mindset/techniques needed to venture in programning with Cpp...

1. Using comments "//" to make your codes readable and traceable .. let me explain...

there are many ways to put comments in your programs, but as a beginner using just "//" will do just fine...

for example.. we intend writing a program that sums two numbers??

imaging the following "scenarios "
(
case 1

int a;
int b;
int c;

c=a+b;
...

)
(
case 2

// program that adds two numbers

int a ; // first number
int b; // second number
int c; // variable rep output

c=a+b; // output of sum off two numbers.
...
)

from the about cases, but programs will run correctly, but case 1 is done by a dirty programmer and it will be hard to understand his work...

but case 2, is a well mapped program and can easily be readable and tracable as well...

it is important to note that anything writing after the // " would be ignored by the compiler ( also called Whitespaces)..


Nb.. its 4:24am, so am off to bed, i promise to update from here tomorrow.... once again thanks...

to be continued...

Ezechinwa:




....Part 3... continues ..

so far, we have learnt up to the point of exploiting the use of Comments(//) when coding, now we can continue to progress further..



2. use of semicolon " ; "....

In English language, its a grammatical error when you don't use punctuations, the same applies to Cpp.
the main function of the semicolon in cpp, is to inform the compiler a certain end of a line of command , its a syntax error when you forget to include them, of course your compiler won't be able to compile your code... brief example below...

{
case 1:

int a // first number
int b // second number
int c // output number

c= a+b // sum of two numbers

}

{
Case 2:

int a ; // first number
int b ; // second number
int c ; // output number

c= a+b ; // sum of two numbers
}

Explaination:: From the two cases above, the first one got it all wrong when she failed to include ";" (semicolon) at the end of her command...
while, the second case is totally correct and acceptable, the guy included semicolon to each command line...

Score: for this error, the current score stands at Men 1 vs Women 0... lol..

Conclusion: always include the semicolon to your command..

Preboy:
You're doing a great job, plz don't relent

I just wish there was something like this for java. I could even switch from java to C++, if this tutorial goes deeper

Ezechinwa:





3. Use of parentheses in cpp...

hmm.. we are moving pretty fast and that's good news, another important aspect to consider is the use of brackets "()" and "{}"...

I related the previous example to English language, but i think it's Maths turn..( just kidding lol)...

Its a syntax error, when you fail to do the following below,

• failing to use curly brackets "{" when opening the program function..
• failing to close the opened curly bracket "}" when done with the program function..

• failing to use pair of bracket after the "main" command ( otherwise referred to the on switch of all cpp codes), as well as during mathematical computation..

Tip: Computer never makes mistake but we do, it only carries out well debugged instruction(s)... so if you find errors in a program, then its your fault not the computer.... for practise reasons, always carry out a bracket count, ensure your brackets are in perfect pair or match.. thankyou...

So far, we have looked into few foundations of C++, like the proper implementation of semicolons, brackets etc, in case your just tuning in, you haven't missed that much, just go back and read from the beginning..

Part 3... continues..

4. Header files and directives...

hmm, you want to write a program ( maybe solve a problem, lets say mathematical in nature) , it is important to add "HEADER FILES" using a directive "#include < header file> ..
don't get overwhelmed, let me explain what i mean, there are lots of "Header files" in cplusplus ( and you are not required to know all of them ), these files have a function to play in the program your building..
furthermore, the files are added to the program using a directive #include. you still don't get it?, OK, consider the two concepts we are discussing here namely "directives" and " header files" relate them to this example, assuming your giving an assignment in mathematics ( " to find the area of a square", of course you will go home and apply the formula "AREA= LENGTH * WIDTH" then return the result which is "AREA" to your teacher isn't it? now see ,

the "HEADER FILE" = FORMULA ( which is Area= length * width)
the Directive( #include) = YOU "applying the formula to the problem" ...

I will share with you few header files for beginners below,
"#include <stdio.h> " //will make the compiler to include the contents of standard header file
"#include <iostream>" // basically tells the compiler: i need input and output..
"#include <math.h> // to preform some mathematical operations, you need this library..

note:: please bear with me, i will get my laptop repaired soon, for now, am typing with a phone.. thank you..

Ezechinwa:



note: from now, i will update this trend using a red color format...i proceed..
So far, we have looked into few foundations of C++, like the proper implementation of semicolons, brackets etc, in case your just tuning in, you haven't missed that much, just go back and read from the beginning..

Part 3... continues..

4. Header files and directives...

hmm, you want to write a program ( maybe solve a problem, lets say mathematical in nature) , it is important to add "HEADER FILES" using a directive "#include < header file> ..
don't get overwhelmed, let me explain what i mean, there are lots of "Header files" in cplusplus ( and you are not required to know all of them ), these files have a function to play in the program your building..
furthermore, the files are added to the program using a directive #include. you still don't get it?, OK, consider the two concepts we are discussing here namely "directives" and " header files" relate them to this example, assuming your giving an assignment in mathematics ( " to find the area of a square", of course you will go home and apply the formula "AREA= LENGTH * WIDTH" then return the result which is "AREA" to your teacher isn't it? now see ,

the "HEADER FILE" = FORMULA ( which is Area= length * width)
the Directive( #include) = YOU "applying the formula to the problem" ...

I will share with you few header files for beginners below,
"#include <stdio.h> " //will make the compiler to include the contents of standard header file
"#include <iostream>" // basically tells the compiler: i need input and output..
"#include <math.h> // to preform some mathematical operations, you need this library..

note:: please bear with me, i will get my laptop repaired soon, for now, am typing with a phone.. thank you..

Ezechinwa:


because i promised to avoid posting long stories aka techno-babbles i will round up this section here and now,,,

5. MENTALITY OF A PROGRAMMER: Before proceeding further to the next stage of Cplusplus which is coding proper, ensure that you have the following at your disposal,

a PC, a COMPILER , a note book,

As programmers, we get paid solving problems ( if you choose to make it a career) and everyday is a challenge, without the listed materials about " i will assume your cramming because practice makes perfect"...

the next frame which is off course PART 4, we will start coding mostly mathematical functions for now( i will start from simple MATHEMATICAL PROBLEMS to Harder mathematical problem ( which involves loops, etc)"

you will wonder why i didn't discuss about concepts like "Variables", " Paragraphs", etc, well, i promise to do that in the next frame... for now , get ready...

share your comments,suggestions and questions... God bless Nigeria'''

leunamme93:

Have being following you... I just got the desire to learn c++ even though its not even near my academic environment, but i want to be different. so God willing pls keep the good work going. Godbless

Ezechinwa:


Part 4... begins here....

great to be back guys. so far, we have been discussing on the ethics of programming with C++, i made mention of the tools and skills required as well... ( i will assume you have them , so be ready) ...

i promised in the last frame to explain some key concepts, which i will do now.. but i will just give a quinessential summary of it, for further references you can read them up online...

briefly, lets talk about "VARIABLES"...

almost , if not all Cplusplus programs contains Variable(s), so its a key concept in programming, consider Variable to be a placeholder( where you store valves) , every variable is also an identifier
... there are different types of variables, but as for beginners i assumed you are, i will mention a few here.. ( pay full attention..).

in order not to forget, lets break Types of variables into the following...

• Numbers :
typically involves variable types like " int" = interger, " double"= numbers with decimal point ... etc..

warning::: the variable types are similar but are not the same, they have a specific function to play,, if i were to write a program involving "Real human numbers" for example, it will be a silly mistake using variable type "double" instead of "int", because we cant have a statement like, "there are two and the half people in the room" but instead " there are three people in the room" respectively..




• Letters/Words :

typically involves variable types as " char" = character ( a single letter ) , "string"= stream of characters.. ( combination of characters to form a word / field...

• Logical ( boolean): in short, the variable type boolean is for compairing two or more quantities.. it has two output namely, true / false or 1/0 respectively..

as i said, you will need to understand this concepts are we head into the next phase...

thank you...

Tip: the more difficult a problem is the more interesting it gets. ...

Ezechinwa:
[/quote]
[quote author=Ezechinwa post=27049534]

Part 4... begins here....

great to be back guys. so far, we have been discussing on the ethics of programming with C++, i made mention of the tools and skills required as well... ( i will assume you have them , so be ready) ...

i promised in the last frame to explain some key concepts, which i will do now.. but i will just give a quinessential summary of it, for further references you can read them up online...

briefly, lets talk about "VARIABLES"...

almost , if not all Cplusplus programs contains Variable(s), so its a key concept in programming, consider Variable to be a placeholder( where you store valves) , every variable is also an identifier
... there are different types of variables, but as for beginners i assumed you are, i will mention a few here.. ( pay full attention..).

in order not to forget, lets break Types of variables into the following...

• Numbers :
typically involves variable types like " int" = interger, " double"= numbers with decimal point ... etc..

warning::: the variable types are similar but are not the same, they have a specific function to play,, if i were to write a program involving "Real human numbers" for example, it will be a silly mistake using variable type "double" instead of "int", because we cant have a statement like, "there are two and the half people in the room" but instead " there are three people in the room" respectively..




• Letters/Words :

typically involves variable types as " char" = character ( a single letter ) , "string"= stream of characters.. ( combination of characters to form a word / field...

• Logical ( boolean): in short, the variable type boolean is for compairing two or more quantities.. it has two output namely, true / false or 1/0 respectively..

as i said, you will need to understand this concepts are we head into the next phase...

thank you...

Tip: the more difficult a problem is the more interesting it gets. ...

leunamme93:
HAha you are not teaching yourself here oooh. God is with Us.

Ezechinwa:




PART 4... Continues....


Note:
Do you want to develop Andriod apps
Do you know you make above $5000 per month with your apps??...

CAPITAL :: #0.00 naira ( absolutly free)...

Prequisites ::: Xml programming+ java programming..
( which i will show you here)

Just need your encouragement ... keep this thread alive ... thankyou ....


TITLE: WRITING YOUR FIRST PROGRAM..


In most programming text books, your first program is usually the "Hello world" , but this is not a textbook, and thats too simply obsolete to begin with...

instead, let's begin with something a little bit adventurous..
...

PROBLEM...

", WRITE A PROGRAM THAT CAN ESTIMATE THE AVERAGE OF THREE NUMBERS"

SOLUTION...

BECAUSE EVERY MOVIE NEEDS SUSPENSE , SO DOES EVERY THREAD,,, LOL.. BUT BEFORE I PROCEED I REALLY NEED RESPONSE, COMMENTS, SUGGESTIONS... ( to ensure am not teaching myself alone) ..lol...

Ezechinwa:




PART 4... CONTINUES......

firstly, to all those following this thread i say a big thank you, and to those just viewing and ignoring this juicy thread , i say in Patience Jonathan's voice ( there is God oh...)


i think at this stage, it will be promptly wrong to tag you lovely followers as beginners, cause at this stage i dont think but i know your ready,, so just relax and watch...

We have a small problem in our hands, which is to write a program that can find the average of three numbers?.... in just a matter of minutes, you'll understand why i referred to it as a small problem...

first, to solve any problem in programming, its best you first understand the nature of that program( in nature i mean algorithm), understand the best choice of variable to use( for mathematicians, a good understanding of domain and range can also be applied here).. and always remember to follow the rules i mentioned above..

enough of my talking, lets start to find a solution to that problem.... be back shortly

Ezechinwa:


Sorry i couldn't complete the solution yesterday ( sleep no gree me)... so i will do that now....

so far, we have written an outline of what our program should look like, is time to apply them... ( don't forget the rules)..

Sit down... Relax..... let's learn together....

// A PROGRAM THAT CAN FIND THE AVERAGE OF /////// THREE NUMBERS.


// include header files, ignore the semicolon below.
1. #include <iostream>
2. #include <cstdio>
3. #include <cstdio>

// add the program namespace and on the program flow.( adding int main)

4. using namespace std ;
5. int main () // ignore semicolon
6. { // open program flow...

// declare the three input variable and a single
//output variable using a suitable variable type below

7. double input1;
8. double input2;
9. double input3;
10. double output1;

// now time to get parameters from the user below.

// First input details
11. cout << " Enter the first valve and press Enter key : " << endl ;
12. cin >> input1;

// second input details
13. cout << "Enter the second valve and press Enter :" << endl;
14. cin >> input2;

// third input details
15. cout << "Enter the Third valve and press Enter:"
<< endl ;
16. cin >> input3;

// mathematical manupulation below.

output1= ( input1 + input2 + input3 ) / 3 ;

// almost done with the problem... display output

17. cout << " the average valve is : " << endl;
18. cout << output1;
19. cout << endl;

system ("PAUSE" ; // allow display to freeze....
return 0 ; // terminate program

}

Ezechinwa:


note....remove that smiley on system ( " pause.. change it to ) .

haxorDelite:
following you bro keep it up, but that "cout" am lost there oo