What is the difference between an array and a vector in C++?

Point	C array	std::array	std::vector
Size	Fixed	Fixed	Changes at run time
Knows its size	No	Yes	Yes
Memory	Stack	Stack	Heap
Bounds check with at()	No	Yes	Yes
Add items	No	No	push_back

#include <array>
#include <iostream>
#include <vector>

int main() {
    int c[3] = {1, 2, 3};
    std::array<int, 3> a = {1, 2, 3};
    std::vector<int> v = {1, 2, 3};
    v.push_back(4);
    std::cout << sizeof(c) / sizeof(c[0]) << ' ' << a.size() << ' ' << v.size() << '\n';
}

See Arrays and Vectors.

• Previous Interview Question
• Next Interview Question

---

Tutorials
No Content Found.

Exercises & Assignments
No Content Found.

Interview Questions & Answers
No Content Found.