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字数 204 阅读 12 评论 6

1. Pushing the values one-by-one

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int main() {
  vector<int> vec;
  vec.push_back(1);
  vec.push_back(2);

  for (int i = 0; i < vec.size(); i++) {
    cout << vec[i] << " ";
  }
  return 0;
}

2. Using the overloaded constructor of the vector class

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int main() {
  int num_of_ele = 10;
  // the overloaded constructor takes the number of
  // values and the value itself as parameters.
  vector<int> vec(num_of_ele, 1);
  for (int i = 0; i < vec.size(); i++) {
    cout << vec[i] << " ";
  }
  return 0;
}

3. Using arrays

Pass an array to the constructor of the vector class

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int main() {
  vector<int> vec{1,2,3,4,5};
  for (int i = 0; i < vec.size(); i++) {
    cout << vec[i] << " ";
  }
  return 0;
}

4. Using another, already initialized, vector

Pass another vector to the constructor of the vector

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int main() {
  vector<int> vec_1{1,2,3,4,5};
  vector<int> vec_2(vec_1.begin(), vec_1.end());
  for (int i = 0; i < vec_2.size(); i++) {
    cout << vec_2[i] << " ";
  }
  return 0;
}