حماد
So maybe I am right 😁
AHMED
#include<iostream>
#include<vector>
using namespace std;
int main(){
vector<int> marks ={55, 78, 98, 34, 54, -53, 0};
cout<<"The original data are:\n";
for (auto el : marks){
cout<<el<<"\n";
}
cout<<"The new data are:\n";
for (auto el : marks){
return el+2;
}
for (auto el : marks){
cout<<el<<"\n";
}
return 0;
}
AHMED
The original data are:
55
78
98
34
54
-53
0
The new data are:
[Program finished]
AHMED
How to make the program add 2 to each element in the vector by making a new vector? And by changing the original vector?
Vlad
Vlad
Or just a range based for
AHMED
How?
Vlad
There's an example at the bottom
AHMED
I did it :
AHMED
#include<iostream>
#include<vector>
using namespace std;
int decrement(int x){
return x-1;
}
int main(){
vector<int> marks ={55, 78, 98, 34, 54, -53, 0};
vector<int> degrees;
cout<<"The original data are:\n";
for (auto el : marks){
cout<<el<<"\n";
}
transform(marks.begin(), marks.end(), marks.begin(), decrement );
cout<<"The new data are:\n";
for (auto el : marks){
cout<<el<<"\n";
}
return 0;
}
AHMED
The problem now is that when I store the new data in a new vector called degrees
And making a range based for loop to cout the members of vector degrees , there is a segmentation fault.
How to solve this?
AHMED
#include<iostream>
#include<vector>
using namespace std;
int decrement(int x){
return x-1;
}
int main(){
vector<int> marks ={55, 78, 98, 34, 54, -53, 0};
vector<int> degrees;
cout<<"The original data are:\n";
for (auto el : marks){
cout<<el<<"\n";
}
transform(marks.begin(), marks.end(), degrees.begin(), decrement );
cout<<"The new data are:\n";
for (auto el : degrees){
cout<<el<<"\n";
}
return 0;
}
AHMED
The original data are:
55
78
98
34
54
-53
0
Segmentation fault
[Program finished]
Vlad
Vlad
That is what to use if you want to populate a vector
Anonymous
Write a C++ program that creates a text file named my_first_file.txt which contains the following string “We have final exam today, and i am best programmer”.
Write a function named filter_words() that reads the file my_first_file.txt and creates a new file my_second_file.txt that will contain only those words from file my_first_file.txt which starts with a lower case vowel words
Hint:
First file text = We have final exam today, and i am best programmer
Second file text = exam and  i am
Anonymous
Anybody help me??
klimi
Anybody help me??
what do you need help with? (you don't want us to write the code do you?)
Anonymous
No
Anonymous
Please help me
AHMED
I wrote this .
And it worked
AHMED
#include<iostream>
#include<vector>
using namespace std;
int decrement(int x){
return x-1;
}
int main(){
vector<int> marks ={55, 78, 98, 34, 54, -53, 0};
vector<int> degrees;
cout<<"The original data are:\n";
for (auto el : marks){
cout<<el<<"\n";
}
transform(marks.begin(), marks.end(), back_inserter(degrees), decrement );
cout<<"The new data are:\n";
for (auto el : degrees){
cout<<el<<"\n";
}
cout<<"The original data again are:\n";
for (auto el : marks){
cout<< el<<"\n";
}
return 0;
}
Hanz
At the first glance i saw the function decrement, i think it is redundant. But then i saw it being used in transform method 😂😅
Hanz
Ah, nevermind
Iqbal
Hi
Can someone share what are the common interview question for embedded software engineer? Thank you ☺️
Aakash
#include<iostream>
#include<vector>
using namespace std;
int main(){
vector<int> marks ={55, 78, 98, 34, 54, -53, 0};
cout<<"The original data are:\n";
for (auto el : marks){
cout<<el<<"\n";
}
cout<<"The new data are:\n";
for (auto el : marks){
return el+2;
}
for (auto el : marks){
cout<<el<<"\n";
}
return 0;
}
You are using..
“return el+2;”
And not..
“cout <<el+2 <<“\n”;
🙃
AHMED
#include<iostream>
#include<vector>
using namespace std;
int main(){
vector<int> marks ={55, 78, 98, 34, 54, -53, 0};
cout<<"The original data are:\n";
for (auto el : marks){
cout<<el<<"\n";
}
cout<<"The new data are:\n";
for (auto el : marks){
cout<< el+2;
}
return 0;
}
AHMED
This is the output:
AHMED
The original data are:
55
78
98
34
54
-53
0
The new data are:
57801003656-512
[Program finished]
AHMED
Ok
Thank u
AHMED
It worked
Ugochukwu
Hi
robherc
Please help me
read each word from the file; compare the first letter to 'a' 'e' 'i' 'o' 'u' 'y'; then output to 2nd file if comparison /=0
robherc
#howtoask
Logan
Where to learn advanced c++ any ideas ???
J
Do you know the basic C++ stuff?
Logan
Ya
J
It can be reading book or find a lecture.
J
Depending which kind you prefer.
Logan
I'm good with them but to get placed intermediate level is needed
Logan
So I wanted to know what it needs to be a intermediate level c++ programmer
J
Ok. I see, it again depending on the definition of *intermediate and advanced*.
J
In book you can check move semantic, smart pointer, ownership. I define them as intermediate.
J
About C++20, you can check cppconference videos.
MAC
So I wanted to know what it needs to be a intermediate level c++ programmer
Base knowledge of os, compt architecture, algorithms and structures
Logan
In book you can check move semantic, smart pointer, ownership. I define them as intermediate.
Oh thanks ,I don't know what they are but I will be trying to learn them
Logan
Base knowledge of os, compt architecture, algorithms and structures
I'm familiar with data structures just need to practice them more
Logan
Base knowledge of os, compt architecture, algorithms and structures
Os base ,does that mean what is process ,child process , parent process , fork function ,pipes
J
I think so.
J
Learning C++ doesn't directly relate OS. But the C++ projects are also so.
MAC
Os base ,does that mean what is process ,child process , parent process , fork function ,pipes
Can you read this code ?
MAC
Os base ,does that mean what is process ,child process , parent process , fork function ,pipes
#include <iostream>
#include <chrono>
#include <thread>
using namespace std;
int lav;
int left(int p)
{
return (p*2+1);
}
int right(int p)
{
return(p*2+2);
}
void rec(int *p,int x, int size)
{
int l = left(x);
int r = right(x);
if(l < size and p[l] > p[x])
{
lav = l;
}
else lav = x;
if(r < size and p[r] > p[lav])
{
lav = r;
}
if(lav != x)
{
int o = p[lav];
p[lav] = p[x];
p[x] = o;
rec(p,lav,size);
}
}
int main(int argc, char *argv[])
{
int mass[21];
for(int p = 0; p <= (sizeof(mass) /4);p++)
{
mass[p] = rand() % 100;
};
int p = 1;
int size = ((sizeof(mass) /4) /2);
int size2 = (sizeof(mass) /4)-1;
for(int i = size; i>= 0;i--)
{
rec(mass,i,(sizeof(mass)/4));
}
cout << endl;
cout << "-------------------------------" << endl;
for(int q = size2; q>= 1;q--)
{
int variable = mass[0];
mass[0] = mass[q];
mass[q] = variable;
for(auto qq:mass)
{
cout << qq << " ";
}
this_thread::sleep_for(chrono::milliseconds(3000));
cout << endl;
rec(mass,0,q);
}
}
Logan
Ya I want to be a c++ developer I have a experience of years with c++ introductory part but really when I see some of c++ code I think I have to learn this
But don't know where to start
J
I think it is a binary heap. :D
Mohannad
بخ
Logan
#include <iostream>
#include <chrono>
#include <thread>
using namespace std;
int lav;
int left(int p)
{
return (p*2+1);
}
int right(int p)
{
return(p*2+2);
}
void rec(int *p,int x, int size)
{
int l = left(x);
int r = right(x);
if(l < size and p[l] > p[x])
{
lav = l;
}
else lav = x;
if(r < size and p[r] > p[lav])
{
lav = r;
}
if(lav != x)
{
int o = p[lav];
p[lav] = p[x];
p[x] = o;
rec(p,lav,size);
}
}
int main(int argc, char *argv[])
{
int mass[21];
for(int p = 0; p <= (sizeof(mass) /4);p++)
{
mass[p] = rand() % 100;
};
int p = 1;
int size = ((sizeof(mass) /4) /2);
int size2 = (sizeof(mass) /4)-1;
for(int i = size; i>= 0;i--)
{
rec(mass,i,(sizeof(mass)/4));
}
cout << endl;
cout << "-------------------------------" << endl;
for(int q = size2; q>= 1;q--)
{
int variable = mass[0];
mass[0] = mass[q];
mass[q] = variable;
for(auto qq:mass)
{
cout << qq << " ";
}
this_thread::sleep_for(chrono::milliseconds(3000));
cout << endl;
rec(mass,0,q);
}
}
Im not familiar with threads and chrono but I understand some of the part like function are there,pointers,random function is used and sleep is also used
MAC
Ya I want to be a c++ developer I have a experience of years with c++ introductory part but really when I see some of c++ code I think I have to learn this
But don't know where to start
It's code for is Linux
#include <sys/msg.h>
#include <sys/types.h>
#include <stdio.h>
#include <iostream>
#include <sys/ipc.h>
#define IDOFSHM 2021
#define PM 1
#define IDOFRCV 2
#define MASSIZE 120
struct message_t{
int type;
char string [MASSIZE];
};
int main(int argc, char *argv[])
{
int f;
if((f = fork()) == 0)
{
char s[MASSIZE];
int p;
struct message_t mymessage;
if((p = msgget(IDOFSHM,0)))
{
printf("Произошла ошибка создания очереди");
exit(-1);
}
while(1)
{
scanf("%s",s);
if(strlen(s) != 1)
{
mymessage.type = PM;
strcpy(mymessage.string,s);
}
else mymessage.type = IDOFRCV;
if(msgsnd(p,&mymessage,sizeof(mymessage),0) != 0)
{
printf("%s","error");
exit(-1);
}
if(strlen(s) == 1) break;
}
}
else if(f > 0)
{
printf("i am parent");
}
else
{
printf("error");
}
exit(-1);
}
Logan
?
Logan
I just know basic theory part of Os
J
Is there any recommendation of a C++ online lecture?
Logan
Is there any recommendation of a C++ online lecture?
I was to ask this any online tutorial which can help a basic level programmer to level up
Logan
?
robherc
Is there any recommendation of a C++ online lecture?
https://www.youtube.com/watch?v=0Cim_ZAj7xE
https://www.youtube.com/watch?v=_bYFu9mBnr4
Adnan
Hy
Nameful
Bruh
MostaFa
Hi guys, I am learning Qt and now I am in the first steps.
how do you think about Qt software?
Do you think being professional in Qt can help us to finding a job?