In case?
It depends on compiler behavior.
Nils
Nils
With some compilers it might break
Pavel
It depends on compiler behavior.
If it's not for type punning (doesn't seem to be), then what can be the issue?
SetPf
serial protocol parsing
Nils
It simply is not defined by the standard
Nils
Means undefined behavior
Vlad
Especially that delete is nasty
Vlad
If you want to type pun use memcpy
Vlad
You won't die by copying 4 bytes over. But your code will be free of ub
Nils
Lol
Nils
Yeah
Nils
Ohhhh so that's what static_cast is for?? Changing signednes? 🤯
SetPf
You won't die by copying 4 bytes over. But your code will be free of ub
i need to push unknown bytes, one by one, in struct, and then, after some movements in memory, take a value of certain type.
I dont know more good way to make it only with array in uinon (as i always made in C)
Vlad
i need to push unknown bytes, one by one, in struct, and then, after some movements in memory, take a value of certain type.
I dont know more good way to make it only with array in uinon (as i always made in C)
uint32_t asuint(uint8_t* ptr)
{
return *reinterpret_cast<uint32_t>(ptr);
}
SetPf
is this is right?
struct Value {
private:
size_t arr_size = 0;
uint8_t array[sizeof(size_t)];
public:
void PushByte(uint8_t i)
{
array[arr_size++]=i;
}
uint32_t asuint(void)
{
return *reinterpret_cast<uint32_t>(array);
}
int16_t asint16(void)
{
return *reinterpret_cast<int16_t>(array);
}
}
Vlad
is this is right?
struct Value {
private:
size_t arr_size = 0;
uint8_t array[sizeof(size_t)];
public:
void PushByte(uint8_t i)
{
array[arr_size++]=i;
}
uint32_t asuint(void)
{
return *reinterpret_cast<uint32_t>(array);
}
int16_t asint16(void)
{
return *reinterpret_cast<int16_t>(array);
}
}
So much so. But array size is unnecessary
SetPf
So much so. But array size is unnecessary
Just ptr++ would be ok for both big and little endians?
I never think about how ptrs behaiving in this cases.
Vlad
struct Value {
private:
uint8_t data[sizeof(size_t)];
public:
uint8_t& operator[](size_t i) { return data[i]; }
}
Vlad
Vlad
I mean why the size of size_t
SetPf
struct Value {
private:
uint8_t data[sizeof(size_t)];
public:
uint8_t& operator[](size_t i) { return data[i]; }
}
Pls explain the last string =) As i understand overloading but for and why?
Vlad
Pls explain the last string =) As i understand overloading but for and why?
You allow user of this partucal struct to access it as array
SetPf
You allow user of this partucal struct to access it as array
I must not encapsulate assembling and casting in it?
Nils
is this is right?
struct Value {
private:
size_t arr_size = 0;
uint8_t array[sizeof(size_t)];
public:
void PushByte(uint8_t i)
{
array[arr_size++]=i;
}
uint32_t asuint(void)
{
return *reinterpret_cast<uint32_t>(array);
}
int16_t asint16(void)
{
return *reinterpret_cast<int16_t>(array);
}
}
Now make the functions inline and const
Nils
Just ptr++ would be ok for both big and little endians?
I never think about how ptrs behaiving in this cases.
Actually nope. big endian would require runtime casting
Nils
Explain pls. About const.
Const means the function won't change any class member so const functions are still callable for const instances
Pavel
Member functions are
Anonymous
Performance, compiler will optimise away pointer if possible.
inline doesn't make compiler to inline a function
Sam
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main()
{
char ch;
char s[100];
char sen[100];
printf("\nEnter char");
scanf("%c",&ch);
printf("Enter word");
scanf("%s",&s);
printf("Enter sentence\n");
fgets(sen,sizeof(sen), stdin);
printf("%c\n",ch);
printf("%s\n",s);
puts(sen);
return 0;
}
Sam
Why isn't the fgets function working
Sam
Pls help
Al
fgets (sen, strlen(sen)+1,stdin)
Al
sam question sorry
Sam
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main()
{
char ch;
char s[1000];
char m[1000];
scanf("%ch\n",&ch);
scanf("%s\n",&s);
fgets(m,sizeof(m), stdin);
printf("%c\n",ch);
printf("%s\n",s);
puts(m);
return 0;
}
Sam
Over here it's working fine
Al
what is the error?
Al
try gdb?
Sam
I tried it
Sam
Can you pls try it once...and send the correct code if possible
Sam
I tried it many times
Al
yes but im in the car and using only phone atm 😄
Sam
Ohh okay...will you pls send it later
Al
ok ok
Sam
Thanks :)
Al
no
Al
np
Al
@sam_1208 you need to fflush(stdin) before fgets
Al
you scanf mess it up stdin
Al
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main()
{
char ch;
char s[100];
char sen[100];
printf("\nEnter char");
scanf("%c",&ch);
printf("Enter word\n");
scanf("%s",s);
printf("Enter sentence\n");
fflush(stdin);
fgets(sen,sizeof(sen), stdin);
printf("%c\n",ch);
printf("%s\n",s);
puts(sen);
return 0;
}
Al
(done in the car via remote terminal)
Al
😂
Al
dont drink and drive
Beyond
wtf
Al
im just a passanger anyway
baydo
UML???
Anonymous
Why isn't the fgets function working
There was probably a newline char just before the line started, use fgets() for all the inputs and sscanf().