vector by index c 2b 2b

1// vector::operator[]
2#include <iostream>
3#include <vector>
4
5int main ()
6{
7  std::vector<int> myvector (10);   // 10 zero-initialized elements
8
9  std::vector<int>::size_type sz = myvector.size();
10
11  // assign some values:
12  for (unsigned i=0; i<sz; i++) myvector[i]=i;
13
14  // reverse vector using operator[]:
15  for (unsigned i=0; i<sz/2; i++)
16  {
17    int temp;
18    temp = myvector[sz-1-i];
19    myvector[sz-1-i]=myvector[i];
20    myvector[i]=temp;
21  }
22
23  std::cout << "myvector contains:";
24  for (unsigned i=0; i<sz; i++)
25    std::cout << ' ' << myvector[i];
26  std::cout << '\n';
27
28  return 0;
29}