Naive Approach to Convert Vector to Array

2. Using copy() function in C++ STL

The vector can be converted to an array by first allocating the array’s memory sufficient to accommodate all vector elements. Then we run a for loop and copy every element of the vector to the array.

Example:

C++

// C++ program to convert vector to 
// array using naive approach
#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    vector<int> v({ 1, 2, 3, 4, 5 });
    int n = v.size();
     
    // Printing original vector
    cout<<"Vector: ";
    for (int i: v) {
        cout << i << ' ';
    }
    cout<<endl;
  
    int arr[n];
    for (int i = 0; i < n; i++) {
        arr[i] = v[i];
    }
     
    // Printing the array
    cout<<"Array: ";
    for (int i: arr) {
        cout << i << ' ';
    }
    cout<<endl;
  
    return 0;
}

Output

Vector: 1 2 3 4 5 
Array: 1 2 3 4 5

Time Complexity: O(n)
Auxiliary Space: O(n)

Different Ways to Convert Vector to Array in C++ STL

An array is the collection of data belonging to a primitive data type. The data in this is kept in a continuous memory location. Vectors are dynamic arrays that can be resized to meet the needs. We can convert vectors to arrays in the following ways given below.

Example:

Input : Vector: [1, 2, 3, 4, 5]
Output: Array: [1, 2, 3, 4, 5]

Input : Vector: [‘G’, ‘e’, ‘e’, ‘k’, ‘s’]
Output: Array: [‘G’, ‘e’, ‘e’, ‘k’, ‘s’]

Here, we will discuss the 5 ways to convert Vector to Array in C++ STL:

Naive Approach to Convert Vector to Array
Using copy() function in C++ STL
Using transform() function in C++ STL
Using data() function in C++ STL
Using & operator in C++

Tags:

#cpp-array #cpp-vector #STL #Technical Scripter 2022 #C++ #Technical Scripter #CPP #STL

2. Using copy() function in C++ STL

Naive Approach to Convert Vector to Array

C++

Different Ways to Convert Vector to Array in C++ STL

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