How to create a Two Dimensional Vector in C++ - Step by Step Examples

How to create a Two Dimensional Vector in C++ ?

Answer

To create a two-dimensional vector in C++, you can use a vector of vectors.


✐ Examples

1 Create a Numeric Two-Dimensional Vector

In this example,

  1. We declare a variable matrix as a vector of vectors, where each inner vector represents a row of the two-dimensional vector.
  2. We initialize matrix with numeric vectors using the push_back method.
  3. Finally, we print the two-dimensional vector to standard output.

C++ Program

#include <iostream>
#include <vector>

int main() {
    // Step 1: Create a numeric two-dimensional vector
    std::vector<std::vector<int>> matrix;
    matrix.push_back({1, 2, 3});
    matrix.push_back({4, 5, 6});
    matrix.push_back({7, 8, 9});
    
    // Step 2: Print the two-dimensional vector
    std::cout << "[";
    for (const auto& row : matrix) {
        std::cout << "[";
        for (int num : row) {
            std::cout << num << ", ";
        }
        std::cout << "], ";
    }
    std::cout << "]";
    
    return 0;
}

Output

[[1, 2, 3], [4, 5, 6], [7, 8, 9]]

2 Create a String Two-Dimensional Vector

In this example,

  1. We declare a variable matrix as a vector of vectors, where each inner vector represents a row of the two-dimensional vector.
  2. We initialize matrix with string vectors using the push_back method.
  3. Finally, we print the two-dimensional vector to standard output.

C++ Program

#include <iostream>
#include <vector>
#include <string>

int main() {
    // Step 1: Create a string two-dimensional vector
    std::vector<std::vector<std::string>> matrix;
    matrix.push_back({"a", "b", "c"});
    matrix.push_back({"d", "e", "f"});
    matrix.push_back({"g", "h", "i"});
    
    // Step 2: Print the two-dimensional vector
    std::cout << "[";
    for (const auto& row : matrix) {
        std::cout << "[";
        for (const std::string& str : row) {
            std::cout << str << ", ";
        }
        std::cout << "], ";
    }
    std::cout << "]";
    
    return 0;
}

Output

[[a, b, c], [d, e, f], [g, h, i]]

Summary

In this tutorial, we learned How to create a Two Dimensional Vector in C++ language with well detailed examples.


More C++ Vectors Tutorials

  1. How to create an Empty Vector in C++ ?
  2. How to Initialize a Vector in C++ ?
  3. How to Get Length of a Vector in C++ ?
  4. How to create a Vector of Size N in C++ ?
  5. How to create a Vector of Numbers from 1 to N in C++ ?
  6. How to create a Vector of Integers in C++ ?
  7. How to create a Vector of Strings in C++ ?
  8. How to create a Vector of Empty Vectors in C++ ?
  9. How to Access Items in a Vector in C++ ?
  10. How to get Item in a Vector at a Specific Index in C++ ?
  11. How to get First Item in a Vector in C++ ?
  12. How to get Last Item in a Vector in C++ ?
  13. How to Iterate Over a Vector in C++ ?
  14. How to Iterate Over a Vector with Index in C++ ?
  15. How to Iterate Over a Vector in Reverse Order in C++ ?
  16. How to check if a Vector is Empty in C++ ?
  17. How to check if a Vector is Not Empty in C++ ?
  18. How to get Sub Vector in C++ ?
  19. How to get the Index of Specified Item in a Vector in C++ ?
  20. How to check if a Specific Item is present in the Vector in C++ ?
  21. How to check if a Vector contains all the items of Another Vector in C++ ?
  22. How to count the Number of Occurrences of Specific Item in the Vector in C++ ?
  23. How to find the Item with Maximum Number of Occurrences in a Vector in C++ ?
  24. How to find the Item with Minimum Number of Occurrences in a Vector in C++ ?
  25. How to Sort a Vector in C++ ?
  26. How to Sort a Vector in Ascending Order in C++ ?
  27. How to Sort a Vector in Descending Order in C++ ?
  28. How to create a Two Dimensional Vector in C++ ?
  29. How to Iterate over a Two Dimensional Vector in C++ ?
  30. How to create a Three Dimensional Vector in C++ ?
  31. How to Copy a Vector in C++ ?
  32. How to Split a Vector in C++ ?
  33. How to Join Vectors in C++ ?
  34. How to Append an Item to a Vector in C++ ?
  35. How to Insert an Item at Specific Index in a Vector in C++ ?
  36. How to Append a Vector to another Vector in C++ ?
  37. How to Concatenate Two Vectors in C++ ?
  38. How to check if Two Vectors are Equal in C++ ?
  39. How to check if Two Vectors have Same Items (Regardless of Order) in C++ ?
  40. How to Convert a Vector of Integers to a Vector of Strings in C++ ?
  41. How to Convert a Vector of Strings to a Vector of Integers in C++ ?
  42. How to Convert a Vector of Floats to a Vector of Strings in C++ ?
  43. How to Convert a Vector of Strings to a Vector of Floats in C++ ?
  44. How to Reverse a Vector in C++ ?
  45. How to Shuffle a Vector in C++ ?
  46. How to Slice a Vector in C++ ?
  47. How to get First N Items from a Vector in C++ ?
  48. How to get Last N Items from a Vector in C++ ?
  49. How to Rotate Items in a Vector in C++ ?
  50. How to Filter Items of a Vector based on a Condition in C++ ?
  51. How to Remove Duplicates in a Vector in C++ ?
  52. How to Remove Item at a Specific Index from a Vector in C++ ?
  53. How to Remove Specific Item from a Vector in C++ ?
  54. How to Remove Items from Vector based on a Condition in C++ ?
  55. How to Sort a String Vector in Dictionary Order in C++ ?
  56. How to Concatenate Strings in Vector in C++ ?
  57. How to create a Vector of Vectors in C++ ?