@programminginc - страница 1857

Jussi

Go program some JavaScript

Lionel

Will there be a run time decision as to where the register variables will be stored if the cpu registers are full?

Jussi

Will there be a run time decision as to where the register variables will be stored if the cpu registers are full?

no.

Jussi

how the hell could the processor do such checks?

Anonymous

Will there be a run time decision as to where the register variables will be stored if the cpu registers are full?

Compiler at compile-time decides which registers are used and which are not

Lionel

Ilya

What if the cpu registers are fully occupied, does the remaining register variables will be pushed onto the stack?

BTW on the one most popular of hardware platforms now, Intel, number of general purpose registers is very limited, namely, 1. Or close to it

Ilya

Will there be a run time decision as to where the register variables will be stored if the cpu registers are full?

No, there will be not

Lionel

how the hell could the processor do such checks?

Just asking. I'm a tyro at this

Ilya

And if you are so interested in this topic, you must know that every variable (lvalue) has an address which can be used in the program. Register variables in general cannot have an address. So if the address of a variable is really used in the program, it cannot be located in registers.

Lionel

And if you are so interested in this topic, you must know that every variable (lvalue) has an address which can be used in the program. Register variables in general cannot have an address. So if the address of a variable is really used in the program, it cannot be located in registers.

Understood

Lionel

Any books for conceptual understanding of c/c++? Recommendations!

Anonymous

Any books for conceptual understanding of c/c++? Recommendations!

C++ and C are different languages with different idioms

Lionel

Okay suggestions for books on C and c++?

Anonymous

Okay suggestions for books on C and c++?

I'd recommend to learn c++ first

Anonymous

https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list

Jussi

I'd recommend to learn c++ first

I'd recommend learning C first, it is much easier

Jussi

learning C takes something between a couple of months to a year

Jussi

C++ I'm still learning after 4 years

Anonymous

I'd recommend learning C first, it is much easier

It's easier but unsafer

Anonymous

I'd recommend learning C first, it is much easier

https://youtu.be/YnWhqhNdYyk

Jussi

It's easier but unsafer

Dunno, I've had way more segfaults with asynchronous C++ shit than with raw pointers in C

Jussi

https://youtu.be/YnWhqhNdYyk

This is just why you should not learn C++ through C

Anonymous

RAII, templates and other make C++ is more type safe language

Jussi

yes

Lionel

If a pointer is not dereferenced properly, it results in segmentation fault or compile time error?

Lionel

RAII, templates and other make C++ is more type safe language

I've been learning c++, but still haven't learnt that much about templates yet

Anonymous

This is just why you should not learn C++ through C

Well, you got my point It's a controversial topic

Anonymous

If a pointer is not dereferenced properly, it results in segmentation fault or compile time error?

The result is undefined behavior

Anonymous

Compiler can't guess that a pointer is invalid

Jussi

Compiler can't guess that a pointer is invalid

+1

Jussi

Well, you got my point It's a controversial topic

yes it is

Lionel

For eg. Let's say a is a 3D array of characters and I dereference it, what's the result.

Jussi

2D array

Jussi

most likely

Anonymous

For eg. Let's say a is a 3D array of characters and I dereference it, what's the result.

Just use std::vector

Lionel

Okay. I'll look into it👍

Anonymous

Or std::array

Pro

This is just why you should not learn C++ through C

actually personally i had no problem learning c++ after c c++ was quite easy to learn for me though

Pro

i dont think it is worrysome thing

Jussi

actually personally i had no problem learning c++ after c c++ was quite easy to learn for me though

yeah that was not the point

Jussi

the point of the video is that you should not write C++ like you wrote C

Pro

yeah that i agree

Jussi

yeah

Jussi

otherwise you should downgrade your compiler to to C++98

Anonymous

Guys, how can I get first two numbers from argument in C like this: ./crack 51v3nsnsjshrvej I need variable, which should take 51.

Jussi

I guess you can use sscanf

Pro

C and C++ have their own set of potential and have their own ways of execution.

Jussi

C and C++ have their own set of potential and have their own ways of execution.

the portability of C code is superior to C++

Pro

can u explain it please?

Lionel

Not sure about c, but c++ would thrive atleast for another 10 yrs in the market

Anonymous

#include<stdio.h> #include<conio.h> void main() { clrscr(); printf("HAPPY GANESH CHATURTHI / all of you"); getch(); }

😂😂

Lionel

What's the logic behind int arr[3] ={1,2,3}; If arr[3] is printed, it gives 0. And arr[4] gives a garbage value

Lionel

What's the logic behind int arr[3] ={1,2,3}; If arr[3] is printed, it gives 0. And arr[4] gives a garbage value

Why is that the next element after the max size gives zero. In this case, it is arr[3] !?

Liam

What's the logic behind int arr[3] ={1,2,3}; If arr[3] is printed, it gives 0. And arr[4] gives a garbage value

Valid range of index is [0, 2]. For 3 and 4, both of them are invalid index. Dereferencing them causes undefined behaviour.

Anonymous

What's the logic behind int arr[3] ={1,2,3}; If arr[3] is printed, it gives 0. And arr[4] gives a garbage value

It's undefined behavior

Anonymous

You accessed element out of range of the array

Lionel

So it depends on the compiler?

Anonymous

So it depends on the compiler?

Kinda

Liam

So it depends on the compiler?

At some level, yes.

Liam

And it also depends on run time memory allocation.

Anonymous

So it depends on the compiler?

This code can format your hard drive, for example

Anonymous

Because it's UB

Liam

lol

Anonymous

It won't happen of course, but it'd be a valid behavior of the program

Lionel

What's the logic behind int arr[3] ={1,2,3}; If arr[3] is printed, it gives 0. And arr[4] gives a garbage value

If I try it with 10 elements (arr[10] ) , and if I try to access arr[11] ,it gives 0. So it seems like an undefined behaviour

Anonymous

If I try it with 10 elements (arr[10] ) , and if I try to access arr[11] ,it gives 0. So it seems like an undefined behaviour

It is

Lionel

👍

Anonymous

If I try it with 10 elements (arr[10] ) , and if I try to access arr[11] ,it gives 0. So it seems like an undefined behaviour