Use the fill_n algorithms: Fill 3 more positions with Y's : fill_n « STL Algorithms Modifying sequence operations « C++ Tutorial






#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>
#include <string>
using namespace std;

int main()
{
  string s("Hello there");
  vector<char> vector1(s.begin(), s.end());


  fill_n(vector1.begin() + 5, 3, 'Y');

  vector<char>::iterator pos;

  for (pos=vector1.begin(); pos!=vector1.end(); ++pos) {
        cout << *pos << ' ';
  }


  return 0;
}
H e l l o Y Y Y e r e








24.2.fill_n
24.2.1.Use the fill_n algorithms: Fill 3 more positions with Y's
24.2.2.Use std::fill_n to fill the first five elements of chars with 'A'
24.2.3.Use fill_n function to insert 'hello' nine times
24.2.4.Use fill_n function to replace all but two elements with 'hi'
24.2.5.Use fill_n to Fill the three elements starting at offset position 3 with value -9