Untitled

#include <iostream>
#include <vector>

int main()
{
	std::vector< int > numbers{ 1, 2, 3, 4, 5, 6, 7 };
	
	for( int i = 0; i < numbers.size(); ++i )
	{
		std::cout << numbers[ i ] << ", ";
	}

	std::cout << '\n';

	numbers[ 3 ] = -78;

	numbers.push_back( 55 );
	numbers.push_back( 73 );

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