DEV Community: saodat19

O'zgaruvchilar

saodat19 — Sat, 21 May 2022 10:38:27 +0000

integer doim butun son Z to'plam
float kasr son
True 1
False 0
input output stream
cout council output
cin council input
endl( "...\n" endline qator tugaganini bildiradi
Alt+Shift+Down
String " "
stringni ichiga olib yozsek matn db qabul qiladi
// bu belgi komentariya izoh qoldirish
\ bu slash
cin dan kegin >>
cout dan keyin <<

include

using namespace std;

int main()
{
int a;
cin >> a; // cin kiritilgan o'zgaruvchilani shartida nima berilgan bo'lsa misol hozir int ga moslab ko'radi mos kelsa oladi

cout << "a\n";

return 0;
} javob a

include

using namespace std;

int main()
{
int a = 10, b = 3 ;
float c = 2.9 ;

cout << a/c ;

return 0;
} javob 3.44828

**#include

using namespace std;

int main()
{
int a = 10 , b = 3;
cout << a % b; // % bu berilgan sonni hisoblab qoldig'ini oladi

return 0;
} javob 1_**_

include

using namespace std;

int main()
{
int a,b ;
cin >> a >> b ;
cout << " a * b = " << a * b;

return 0;
}

javobga 30 73 ni kiritaman
a * b = 2190

CHAR belgi character
faqat bitta belgini sig'diradi

include

using namespace std;

int main()
{
char a , b ; // char __ o'zgaruvchining turi ;
a, b ___ o'zgaruvchining nomi
cin >> a >> b ;
cout << a << b;

return 0;
}

**#include

using namespace std;

int main()
{
char a;
cin >> a;
cout << char(a-32);

return 0;
}
javob
c kiritsam
C (katta C kelb chqdi)
**

C++da Operators

saodat19 — Thu, 05 May 2022 12:06:37 +0000

Operatorlar ikkiga turga bo'linib, ular quyidagilar:
binary(+,/,*,-)

unary

Arithmetic operators
/ amalini bajarayotganda, ma'lumotni turi muhim bo'lib, kasr son kasr songa, butun son butun songa bo'linayotganini bilish kerak, yo'qsa misolni javobida o'zgarish bo'ladi.

modulus faqat butun sonlar ustida amallarni bajaradi.

amallar matematika bn bir xildek ketma ketlikda bajariladi.

shortcuts

a += 1
a *(/, -, %)= 4
faqat ushbu qiymatlar uchun shortcut mavjud:

a += 1* --> a++;
a -= 1* --> a--; Danger ++x --> increase x by 1 and do other operations x++ --> do other operations and increase by 1 --x --> decrease x by 1 and do other operations x-- --> do other operations and decrease by 1

sample int x =5; int y =x++;
cout << x << y << endl;

after running, the answer is---> 6 5

Relational operator
relationship between left and right sides
result is always either True(1) or False(0)
operators-- <, <=, ==, >=, >, !=
Logical operators
!=not
&&=and--> hammasi to'g'ri bo'lishi shart.
||=or --> 1tasi to'g'ri bo'lsa ham, hisobga o'taveradi.

C++ Variables

saodat19 — Thu, 28 Apr 2022 09:08:47 +0000

Data types
Int:
short,long,Int(butun sonlar);
##Real number:
float,double(kasr sonlari);
##Character:

char(belgilar)

int age=18
cout << age+5*26 << endl; (148)
Declaration
bu o'zgaruvchilarni e'lon qilish;
int son;
Assignment
bu o'zgaruvchiga qiymat o'zgartirish
Garbage value
o'zgaruvchi yaratilsa-yu unga qiymat berilmasa, uning qiymati unexpected bo'ladi (4 bayt)
float
kasr- real sonli o'zgaruvchi ,lekin butun sonlarni ham qabul qiladi va 1.0 ko'rinishiga aylantiradi. Nuqtadan keyin 6 ta son aniqlikda ishlaydi: 0.123456
`Implict coversion
yashirin o'zgartirish jarayoni, masalan int a=1,9 berganda warning berib ogohlantiradi, ya'ni yashirin o'zgartirish jarayonida compiler butun sonli o'zgaruvchi borligi tufayli 1,9 ni 1 deb qiymatini o'zgartirayotganligidan userni ogohlantiradi.
cin
terminalga input ma'lumotni kiritadi.
double
floating data typega mansub - kasr sonli o'zgaruvchi.(8 bayt)
Iomanip
representationni boshqaradigan kutubxona

#include

saodat19 — Thu, 28 Apr 2022 09:01:34 +0000

alias run='clear && g++ main.cpp -o dastur && ./dastur'
* bu in out stream ya'ni kiritish chiqish oqimi hisoblanadi *

int main bu asosiy darvoa hisoblanib bu darvoza bitta hisoblanadi ma'lumotla shundan kiradi

"" bu string(ip) deb nomlanadi string ichidagi belgilar ingliz tilida character deyiladi

\bu backslash (escape character) bo'lib , agarda string ichida qo'shtirnoq bo'lsa uni yoniga yana backslash qo'yiladi M-n : " men "a'lochi" o'quvchiman " bu yerda biz " men \"a'lochi\" o'quvchiman" deb yozilishi kerak

cout komandasi beriadi va bu cout

kamandalar in replit

saodat19 — Sat, 23 Apr 2022 08:45:07 +0000

'pwd'

joriy papka manzilini chop etadi

sh
pwd

'clear'

terminaldagi hamma tekstni tozalab yuboradi

sh
clear

ls

shu papka ichidagi hamma narsani listga chiqarib beradi

ls -a

yashirin fayllarni ham chopetadi sh ls -a

mkdir

sh
make directory

berilgan nomda papka yaratadi

cd (current directory)

istalgan papkaga o'tadi

cat

berilgan tekst fayl ichidagi kontentni terminalga chop etadi

cd ~ tilda

-homega qaytish uchun

open .

-shu papkani ochib beradi

rmfaylni nomi

-faylni o`chiradi

rm -r

-papkalani o`chiradi

echo 12345>> temp/son.text

-papkani ichida fayl yaratish