How do I use std::vector::resize in C++11?

Can you explain how to use std::vector::resize in C++11?

Sure! The std::vector::resize function changes the size of the vector. You can increase or decrease its size.

What happens if I resize a vector to a smaller size?

If you resize a vector to a smaller size, the elements beyond the new size are removed.

And what if I resize it to a larger size?

When you resize to a larger size, new elements are added, and they are initialized to the default value.

Can you show me a code example?

Of course! Here's a simple example:

#include <vector>
#include <iostream>

int main() {
    std::vector<int> vec = {1, 2, 3};
    vec.resize(5); // Now vec contains {1, 2, 3, 0, 0}
    for (int i : vec) std::cout << i << ' ';
}

This will output: 1 2 3 0 0.