Question

How to copy one vector into another in C++

Answer 1

#include <iostream> 
#include <vector>
#include <algorithm>

using std::vector;
using std::cout;  
using std::endl;

void print(int n) {
	cout << n << " ";
}

int main()
{
	vector<int> vec1{ 13, 12, 300, 1, 98 }, vec2(5);
	
	copy(vec1.begin(), vec1.end(), vec2.begin());

	for_each(vec2.begin(), vec2.end(), print);

	cout << endl;

	return 0;
}

/*
run:

13 12 300 1 98

*/

 

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Answer 2

#include <iostream> 
#include <vector>
#include <algorithm>

using std::vector;
using std::cout;
using std::endl;

void print(int n) {
	cout << n << " ";
}

int main()
{
	vector<int> vec1{ 13, 12, 300, 1, 98 }, vec2(5);

	vec2.resize(vec1.size());
	for (unsigned int i = 0; i < vec1.size(); i++) 
		vec2[i] = vec1[i];

	for_each(vec2.begin(), vec2.end(), print);

	cout << endl;

	return 0;
}

/*
run:

13 12 300 1 98

*/

 

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