Forem: Mohira21

Selection statements | Difference between if else and else if

Mohira21 — Tue, 10 May 2022 08:38:16 +0000

Selection statements

`if statement` `if~else statement`

ikki yoki undan ko'p execution pathlarni tanlaydi

if (a>=0)
cout << "positive";
if (a<0)
cout << "negative";

If statement

if expression is true, execute statement1
- Syntax

if(expression)
{(body) 
statement1
}

Example

if (a>=0)
cout << "positive";

don't use semi-colon (;) after if(expression)
- Agar semi-colon ishlatilsa, if statement mustaqil bo'lib qoladi.
Agar if statementda faqat bitta statement bo'lsa {} qo'yilmaydi.

    int a,b,c;

  cin >> a >> b >> c;

  int max = a > b ? a : b;

    if (max > c)
      cout << max << endl;

Agar if statement condition bajarilmasa output da hech narsa chiqmaydi.
If statement faqat o'zidan keyingi birinchi turgan cout ga ta'sir qiladi.
Use == (Realtion operator), don't use = (Assignment)

    if (team == '10')
    cout << "Lions" << endl;
not
    if (team = '10')
        // result team is 10

If-else statement

If expression is true, execute statement1. If false, execute statement2
Syntax

if(expression)
{(body) 
statement1
} 
else
{(body) 
statement2
}

Example

    if (son%2 == 0)
    cout << "even" << endl;
    else 
    cout << "odd" << endl;

if statement contains another if statement (including if-else statement)

if (a>=0)
   if (x%2 ==0)
   cout << "positive even number" << endl;
   else 
   cout << "positive odd number" << endl;

else-if statement

Example

    if (a>='A' && a<='Z')
    cout << "Upper-case" << endl;
        else if (a>='a' && a<= 'z')
        cout << "Lower-case" << endl;
            else if (a>='0' && a<='9')
            cout << "Number" << endl;
                else 
                cout << "Others" << endl;

C++ | Variables and date types

Mohira21 — Thu, 28 Apr 2022 09:44:40 +0000

Data types

Int :

short, long, int (butun sonlar);

Real number :

float, double (kasr sonlar);

Character :

char (belgilar).

int age=14;
cout << age + 5 * 26 << endl; (144)
age= -15

`Declaration`

bu o'zgaruvchilarni e'lon qilish;

int height;
weight double;
float radius;

`keywords`

int, double,float ...
- cannot use as identifiers.

`Assignment`

bu o'zgaruvchiga qiymat o'zgartirish;

son=25;

`Initalization`

o'zgaruvchini e'lon qiish vaqtida birdaniga qiymat berish;

int 6 = 16;

O'zgaruvchi nomi harflar, raqamlar va _ belgisidan iborat bo'lishi kerak.

int a=5;
int b=a;
int c=a+b;
int a;
float b; int a,c;
int c; float b,d;
float d;

`Garbage value`

declaration kiritilsayu, o'zgaruvchi miqdori kiritilmasa councilda chiqadigan taxminiy sonlar

   int a= 123.45 --> 123
   float a= 123 --> 123.00

int vazn = (int)[majburlash] 120.123

int a=10;
int b= a+10;
int c= a+b;int d+ a+b+c;

a=b=c=d=60

`cin >>`

o'zgaruvchini o'qiydigan komanda
- char --> Ascii table

char belgi= 'a'

cout << (char) (belgi/3) << endl; [majburlash]

`iomanip`

input output manipulation, kutubxona

`setw()`

o'zgaruvchi uchun print qlishda bo'sh katakchalar so'raydi

cout << setw(15) << son << endl; [by default right-aligned]
cout << left << setw (15) << son << endl;
```



## `setfill('')`
- `setw()` orqali ajratilgan yacheykalarni belgilar bn to'ldiradi

Terminal komandalar | Part 3 | C++

Mohira21 — Tue, 26 Apr 2022 06:28:23 +0000

`alias nickname=''`

bu komanda takroriy ishlatiladigan komandalar uchun yangi taxallus (nickname) beradi.

g++ main.cpp -o dastur && ./dastur

main.cpp nomli faylni compilatsiya qiladi va birdaniga ishga tushiradi.

`nano`

faylni terminalda ochadi

./..a.out

birdaniga bitta oldingi papkaga kirib, uning ichidagi ma'lumotni chiqaradi

`include`

kerakli kutubxonani chaqiradi. Masalan "iostream" (input output stream)

`terminal = council`

`std`

standart namespace

`cout`

cout <<
qator boshida yoziladi

`endl` (endline)

<< endl;
qator tugaganda yoziladi va qator tugaganini bildiradi

`int main()`

dasturga kirish uchun funksiya

`int main()`

bu siz dastur ishlamaydi.

`return 0`

dastur muvaffaqiyatli bo'lganini aniqlashtirish uchun foydalaniladi.

`"string"`

qo'shtirnoq ichida yozilgan so'z va sonlar "string" deyiladi.

`&&`

komandalarni bir vaqtda birin ketin bajarilishini ta'minlaydi

// (ctrl+/)

// c++ dasturida izoh qoldirishda foydalaniladi

\n

new line = endl. Sonlar bn ishlamaydi.

`\ backslash-- escape characters`

Terminal komandalar | Part 2

Mohira21 — Sat, 23 Apr 2022 06:52:29 +0000

`cd ~`

home papkaga qaytadi

cd ~/papka nomi

har qanday papkadan shu papkaga o'tadi

open . yoki start .

file explorerda shu papkani ochadi

`mkdir`

mkdir papka-nomi yoki mkdir 'papka-nomi'

yangi papka ochadi
agar papka nomi probel bilan yozilsa alohida-alohida papka ochadi

`echo salom >> salom.txt`

joriy papkada text fayl ochadi

echo "bugun havo yaxshi" >> salom.txt

tekstga yangi so'z/gap qo'shiladi

`rm` (remove)

rm salom.txt

har qanday faylni o'chiradi (papkani emas)

rm -r (recursion)

har qanday papka va uning ichidagi barcha narsani o'chiradi

rm -rf (force)

o'chmayotgan faylni yoki pakani majburlab o'chirib yuborsa bo'ladi ! Bu komanda orqali o'chirilgan fayl va papkalar korzinkaga tushmaydi!

`date`

bu komanda hozirgi vaqtni chop etish uchun ishlatiladi

date

Sat Apr 24 10:11:25 + 04 2022 ko'rinishida sanani chop etadi

date '+%d-%m-%Y'

sanani dd-mm-yyyy formatda chop etadi 24-0 4-2022

date '+%d/%m/%Y'

24/04/2022 ni chop etadi

mkdir $(date)

bugungi sana bilan papka ochadi (faqat sana,oy,yil,... alohida alohida papka bo'lib ochiladi)

mkdir $(date '+%d/%m/%Y')

bugungi sana bilan paka yaratadi 24/04/2022 ko'rinishida

Terminal komandalar | Part 1

Mohira21 — Tue, 19 Apr 2022 12:12:38 +0000

`pwd`(print working directory)

joriy papka manzilini chop etadi.

/home/runner/Terminal/FOUNDATION

`clear`

terminaldagi hamma textni tozalab yuboradi.

`ls`

list of files in terminal

main.cpp Makefile replit.nix

`ls -a`

list of all files (with hidden files)

.  ..  .cache  .ccls-cache  main.cpp  Makefile  .replit  replit.nix

`mkdir` [directory]

mkdir FOUNDATION

`cd`(current directory)

changing pwd

cd FOUNDATION

`cd ..`

bitta orqaga qaytish

cd ..

`cat [file name]`

papkadagi text filelarni ko'rsatadi

#include <iostream>

int main() {
  std::cout << "Hello World!\n";
}

Forem: Mohira21

Selection statements | Difference between if else and else if

Selection statements

if statement if~else statement

If statement

If-else statement

else-if statement

C++ | Variables and date types

Data types

Int :

Real number :

Character :

Declaration

keywords

Assignment

Initalization

O'zgaruvchi nomi harflar, raqamlar va _ belgisidan iborat bo'lishi kerak.

Garbage value

cin >>

iomanip

setw()

Terminal komandalar | Part 3 | C++

alias nickname=''

nano

include

terminal = council

std

cout

endl (endline)

int main()

int main()

return 0

"string"

&&

\ backslash-- escape characters

Terminal komandalar | Part 2

cd ~

mkdir

echo salom >> salom.txt

rm (remove)

date

Terminal komandalar | Part 1

pwd(print working directory)

clear

ls

ls -a

mkdir [directory]

cd(current directory)

cd ..

cat [file name]

My first post

HELLO WORLD

My name is Mohira and i'm 21 years old

Currently i'm a student at UzSWLU and my major is Spanish language

Learning new languages is my hobby and I can speak in:

`if statement` `if~else statement`

`Declaration`

`keywords`

`Assignment`

`Initalization`

`Garbage value`

`cin >>`

`iomanip`

`setw()`

`alias nickname=''`

`nano`

`include`

`terminal = council`

`std`

`cout`

`endl` (endline)

`int main()`

`int main()`

`return 0`

`"string"`

`&&`

`\ backslash-- escape characters`

`cd ~`

`mkdir`

`echo salom >> salom.txt`

`rm` (remove)

`date`

`pwd`(print working directory)

`clear`

`ls`

`ls -a`

`mkdir` [directory]

`cd`(current directory)

`cd ..`

`cat [file name]`