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  1. #include <iomanip>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. typedef std::vector<std::vector<int>> vector2d;
  6.  
  7. vector2d CreateVector2d()
  8. {
  9.     vector2d v2d(3, std::vector<int>(3));
  10.  
  11.     for (unsigned i = 0; i < 3; ++i)
  12.         v2d[i][i] = 1;
  13.  
  14.     return v2d;
  15. }
  16.  
  17. void print(std::ostream& os, const vector2d& v)
  18. {
  19.     // C++11:
  20.     for (auto & vec : v)
  21.     {
  22.         for (auto & i : vec)
  23.             os << std::setw(2) << i;
  24.         os << '\n';
  25.     }
  26.  
  27.     // or:
  28.  
  29.     //for (vector2d::const_iterator i = v.begin(); i != v.end(); ++i)
  30.     //{
  31.     //    for (std::vector<int>::const_iterator j = i->begin(); j != i->end(); ++j)
  32.     //        os << std::setw(2) << *j;
  33.     //    os << '\n';
  34.     //}
  35.  
  36.     // or:
  37.     //for (unsigned i = 0; i < v.size(); ++i)
  38.     //{
  39.     //    for (unsigned j = 0; j < v[i].size(); ++j)
  40.     //        os << std::setw(2) << v[i][j];
  41.     //    os << '\n';
  42.     //}
  43. }
  44.  
  45. int main()
  46. {
  47.     print(std::cout, CreateVector2d());
  48. }
Success #stdin #stdout 0s 3028KB
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stdin
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Standard input is empty
stdout
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 1 0 0
 0 1 0
 0 0 1
https://ideone.com/4xnFYA
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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