C++ dynamic memory explained for beginners 🧠

#dynamic #memory #new

Dynamic memory new operator C++ tutorial example explained

[BroCodez]

#include <iostream>

int main () {

char *pGrades = NULL;
int size;

std::cout << "How many grades to enter in?: ";
std::cin >> size;

pGrades = new char[size];

for(int i = 0; i < size; i++){
std::cout << "Enter grade #" << i + 1 << ": ";
std::cin >> pGrades[i];
}

for(int i = 0; i < size; i++){
std::cout << pGrades[i] << " ";
}

delete[] pGrades;

return 0;
}

[thechudson]

This helped me understand pointers so much more than your original video did. Not that your previous vid didn’t make sense, it just feels much more more practically applicable now compared to before. Much thanks

[dc]

bro youre an awesome teacher, thanks so much for everything

[dynamagon]

Hey do you think you could do an episode on std::vectors ? I think a lot of people could get a ton of use out of them.

[JackEvans-hfqt]

//allocating dynamic memory to pointers and printing the no . of items specified by the user in c++
# include<iostream>

using namespace std;

int main()
{
string *ptr= NULL;
int size;
string temp;
cout<<"Enter the no. of cars to print:";
cin>>size;
ptr=new string[size];
for(int i=0;i<size;i++)
{
cout<<"Enter car no."<<i+1<<" or q to quit:";
getline(cin>>ws, temp);
if(temp=="q")
{
break;
}
else
{
ptr[i]=temp;
}
}
cout<<"\nYou entered the following cars:\n";
for(int i=0;!ptr[i].empty();i++)
{
cout<<ptr[i]<<endl;
}
delete[] ptr;
return 0;
}

[ngchn]

Thank you so much!! Wish I found this video sooner

[willlagergaming]

#include <iostream>

int main () {

int size;

std::cout << "How many grades to enter in?: ";
std::cin >> size;

char pGrades[size];

for(int i = 0; i < size; i++){
std::cout << "Enter grade #" << i + 1 << ": ";
std::cin >> pGrades[i];
}

for(int i = 0; i < size; i++){
std::cout << pGrades[i] << " ";
}

return 0;
}

is there a disadvantage of doing it without pointer?

[TheDreamN]

Would it be better to use vectors instead when unsure of the array size and what it would be?

[Dazza_Doo]

I see, this is where the New keyword came from, as you know C# doesn't run without it!

[emilgmelfald]

Why do you use NULL instead of nullptr? Is there an important difference between the two?