C++ supports six different grammar for regular expressions. By default, the ECMAScript grammar is used. This one is the most powerful grammar of the six grammars and is quite similar to the grammar used in Perl 5. The other five grammars are the basic, extended, awk, grep, and egrep grammars.

#include <regex> ... std::string regExpr("C\\+\\+"); std::string regExprRaw(R"(C\+\+)") this is how reex looks

#include <regex> ... std::string regExpr("C\\+\\+"); std::string regExprRaw(R"(C\+\+)") this is how reex looks

#include <regex> ... std::string regExpr("C\\+\\+"); std::string regExprRaw(R"(C\+\+)") this is how reex looks

C++ provides a nice alternative data type to manipulate strings, and the data type is conveniently called string. Some of its widely used features are the following: - Declaration: string a = "abc"; - Size: int len = a.size(); - Concatenate two strings: string a = "abc"; string b = "def"; string c = a + b; // c = "abcdef". - Accessing i^th element: string s = "abc"; char c0 = s[0]; // c0 = 'a' char c1 = s[1]; // c1 = 'b' char c2 = s[2]; // c2 = 'c' s[0] = 'z'; // s = "zbc" P.S.: We will use cin/cout to read/write a string.

how do i debug in vs code(CODELLDB) for c++

it just simply runs the code

put break point first.

i did do i have to do smth about that catch throw thing

check this first. https://github.com/vadimcn/codelldb/blob/v1.9.2/MANUAL.md#launching-a-new-process if you want auto break at exception then you will need to set those up.

Why , 1 byte is 8 bit ..y not 9 bit, y not 10 bit?

Why , 1 byte is 8 bit ..y not 9 bit, y not 10 bit?

Why , 1 byte is 8 bit ..y not 9 bit, y not 10 bit?

Why , 1 byte is 8 bit ..y not 9 bit, y not 10 bit?

https://en.wikipedia.org/wiki/Byte

1 byte in C++ is ≥ 8 bit

He must also ask why a nibble has 4 bits 🥲

Idk what a nibble is

I've never heard this term I think it's not quite used

Why , 1 byte is 8 bit ..y not 9 bit, y not 10 bit?

I've never heard this term I think it's not quite used

In 8-bit microcontrollers was widely used when the protocols are more swallow in terms of transmission speeds (80s, I'm calling you!). For example, an ethernet transmission consists of a nibble to adjust the transmission speed between node and router (4 bits in 1-0-1-0 sequence to stablish the clock of the transmission)

So it's just not used in my field

In ML they just say "4 bit"

In ML-on-the-edge is still used when parameters are quantized, as float16 (for example) is called "half float" but in wider fields is not used or known by other engineers

I'm talking only about the word itself

The half-float is another example, not the main topic, only another example of "wording" about terminology not widely used today 😁

I think it's widely used among those people who use half floats

Can anyone pls explain me what's the char**ptr See char *ptr means we are declaring a char pointer but what's char**ptr

And can we make a array of string using char*words[] = {"Harry","jaggu"}; like this

char is a type char* is pointer to char type and char** is a pointer to char* because all pointers are variables themselves you can point to them (save their address as value)

char is a type char* is pointer to char type and char** is a pointer to char* because all pointers are variables themselves you can point to them (save their address as value)

and it's better to use const char* instead of char* every where you have string litteral like "ASDasd"

But when to use char*ptr

when you have string litteral hardcoded in your program

And in book there is char**ptr 🥲

when you want to allocate strings dynamicly or point to 2d array

Ok we use Char*ptr and ptr= (char*) malloc (n*sizeof(char)) so here ptr is allocated dynamically and char**a=&ptr; Here a is pointing ptr Like this?

But when to use char*ptr

lme show an example int a[10][20] how can you point that and iter over that?

The name of a char array decays to a char* easily. It depends on the situation you may need such a pointer. Or something like: char ch {'f'}; char* pch {&ch}; Better alternative is using std::string or std::vector<std::string> (ofc if you code in C++)

🥲idk Havent use 2d array much

lme show an example int a[10][20] how can you point that and iter over that?

so what is your need? if you want a simple string you can use char a[100] const char* a them the first for runtime mutation and the second for string litterals

See If u use char*words[] Like this nd store some string in this array And in function call we use char**ptr to point these type of arrays

const char* word[] = {"a","b","c","d"} for (int i=0;i<4;i++) cout << word[i] << endl;

See If u use char*words[] Like this nd store some string in this array And in function call we use char**ptr to point these type of arrays

Haven't learn c++ idk cout etc😢 But will learn it soon

so replace cout statement with printf("%s\n",word[i]);

const char* word[] = {"a","b","c","d"} for (int i=0;i<4;i++) cout << word[i] << endl;

should be std::cout and std::endl since neither using namespace std; nor using std::cout, std::endl has been written before this line

C#

Which language i should learn first?

for what?

To become good programmer

Learn c if u are first year or second year student or a school student