vector_assign

学习vector中的assign

// vector assign
#include <iostream>
#include <vector>

using namespace std;

int main ()
{
    //assign 给vector分配
  vector<int> first;
  vector<int> second;
  vector<int> third;

  first.assign (7,100);             // 7 ints with a value of 100

  vector<int>::iterator it;
  it=first.begin()+1;

  second.assign (it,first.end()-1); // the 5 central values of first

  int myints[] = {1776,7,4};
  third.assign (myints,myints+3);   // assigning from array.

  cout << "Size of first: " << int (first.size()) << '\n';
  cout << "Size of second: " << int (second.size()) << '\n';
  cout << "Size of third: " << int (third.size()) << '\n';

  for(vector<int>::iterator it=second.begin();it!=second.end();++it)
    cout<<' '<<*it;
  return 0;
}

/*
Output:
Size of first: 7
Size of second: 5
Size of third: 3
*/