How to create a dynamic array of integers in C++

This is an easy way to create a dynamic array of integers, strings, or another object in C++.

Using the Standard Template Library in C++11. Using the vector class declares your array.
#include <vector>

vector<int> myarray;
vector<string> mystringarray;

Please follow my example to understand how to create a dynamic arrays in C++

I will create 10 items and add some contents in that array by using the push_back function.

But I do not need 10 items, just 5 items are enough. So I use the resize() function to change the size of array.

After that, I need 10 more items and their values are 20. So 5 items in my array plus 10 items, it will be 15 items.

myarray.resize(15, 20); the first section is for your number of items in your array, and the second section is for their values of the 10 items later.

Finally, I need more items, it's about 10 items. Just resizing one more time. But I do not want put values for them. So their values will be 0.

	#include <iostream>
	#include <string>
	#include <vector>
	using namespace std;
	int main()
	{
	//Declare an integer array
	vector<int> myarray;
	//Now you have 10 items and wanna put them to your array
	//Using the push_back function to add your content.
	for (int i = 0; i < 10; i++)
	{
	myarray.push_back(i);
	}
	for (int number : myarray)
	cout << number << " ";
	cout << endl;
	//Now I just want 5 items in my array, just resizing that array
	myarray.resize(5);
	for (int number : myarray)
	cout << number << " ";
	cout << endl;
	//After that, I will add 10 items to that array with the default values are 20.
	//It means you have 5 items in your array, and add 10 more items. So 5 + 10 = 15.
	//Put that number in the first section of the resize function.
	myarray.resize(15, 20);
	for (int number : myarray)
	cout << number << " ";
	cout << endl;
	//Now I need more items, it's about 10 items. Just resizing that array again.
	myarray.resize(25);
	for (int number : myarray)
	cout << number << " ";
	cout << endl;
	system("pause");
	return 0;
	}

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How to create a dynamic array of integers in C++