The 3D vector in C++
A 3D vector is a type of multidimensional vector having 3 dimensions. It can also be interpreted as a vector with a collection of 2D vectors inside it.
Syntax:
vector<vector<vector<int>>> v;
Example:
1 D vector -> { 1 , 2, 3 }
2 D vector -> { { 1,2,3 } , {4,5,6} }
3 D vector -> { { { 1,2,3 } , {4,5,6} } , { { 11,12,13 } , {14,15,16} } , { { 21,22,23 } , {24,25,26} } }
Below is the code of the example:
C++
#include <iostream>#include <vector>using namespace std;int main(){ // 1D Array vector<int> a = { 1, 2, 3 }; cout<<"1D vector\n"; for (int i = 0; i < a.size(); i++) { cout << a[i] << " "; } // 2D Array vector<vector<int> > b = { { 1, 2, 3 }, { 4, 5, 6 } }; cout<<"\n\n2D vector\n"; for (int i = 0; i < b.size(); i++) { for (int j = 0; j < b[0].size(); j++) { cout << b[i][j] << " "; } cout << endl; } // 3D Array vector<vector<vector<int> > > c = { { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } }, { { 11, 12, 13 }, { 14, 15, 16 }, { 17, 18, 19 } }, { { 21, 22, 23 }, { 24, 25, 26 }, { 27, 28, 29 } } }; cout<<"\n\n3D vector\n"; cout << "[\n"; for (int i = 0; i < c.size(); i++) { for (int j = 0; j < c[0].size(); j++) { cout << " [ "; for (int k = 0; k < c[0][0].size(); k++) { cout << c[i][j][k] << " "; } cout << "]"; } cout << endl; } cout << "]"; return 0;} |
Output
1D vector 1 2 3 2D vector 1 2 3 4 5 6 3D vector [ [ 1 2 3 ] [ 4 5 6 ] [ 7 8 9 ] [ 11 12 13 ] [ 14 15 16 ] [ 17 18 19 ] [ 21 22 23 ] [ 24 25 26 ] [ 27 28 29 ] ]
Initializing Vector using an Existing Vector in C++ STL
A vector is a type of container which can store objects of similar data type. Vector acts like a dynamic array where we can insert elements and the size of the array increases depending upon the elements inserted.
Syntax:
vector<data_structure/type> vector_name(size, item)
To know more about vectors refer to vectors in C++.