Arrays in C++

C++ Arrays

This is the c++ way of doing arrays. It is a lightweight wrapper for c-style arrays.

std::array<type, size>

Example:

#include <iostream>
#include <array>

int main() {
  std::array<std::string, 3> myArray = {"en", "to", "tre"};

  std::cout << "Length of array: " << myArray.size() << std::endl;

  for (std::string e : myArray) {
    std::cout << e << std::endl;
  }

  return (0);
}

Old C-style Arrays

This is the C way of doing arrays.

WARNING: The length of the array must be known at compile time! WARNING: Accessing an invalid index results in undefined behavior.

Allocate then Assign

// Allocate memory for three integers. 
int myArray[3]; 

// We can set each value like this
myArray[0] = 0;
myArray[1] = 0;
myArray[2] = 0;

Assign and Allocate

int myArray[] = {1, 2, 3, 4};

Lengh of Array

You cannot get the length of the array directly.

You can however use the sizeof(myArray) function to find out how much memory is allocated.

It is probably best to just remember the length as it must always be constant.

#cpp

;

// We can set each value like this myArray[0] = 0; myArray[1] = 0; myArray[2] = 0;

##### Assign and Allocate
```cpp
int myArray[] = {1, 2, 3, 4};

Lengh of Array

You cannot get the length of the array directly.

You can however use the sizeof(myArray) function to find out how much memory is allocated.

It is probably best to just remember the length as it must always be constant.

#cpp

= 0; myArray[1] = 0; myArray[2] = 0;

##### Assign and Allocate
```cpp
int myArray[] = {1, 2, 3, 4};

Lengh of Array

You cannot get the length of the array directly.

You can however use the sizeof(myArray) function to find out how much memory is allocated.

It is probably best to just remember the length as it must always be constant.

#cpp

= 0; myArray[2] = 0;

##### Assign and Allocate
```cpp
int myArray[] = {1, 2, 3, 4};

Lengh of Array

You cannot get the length of the array directly.

You can however use the sizeof(myArray) function to find out how much memory is allocated.

It is probably best to just remember the length as it must always be constant.

#cpp

= 0;

##### Assign and Allocate
```cpp
int myArray[] = {1, 2, 3, 4};

Lengh of Array

You cannot get the length of the array directly.

You can however use the sizeof(myArray) function to find out how much memory is allocated.

It is probably best to just remember the length as it must always be constant.

#cpp

= {1, 2, 3, 4};

#### Lengh of Array
You *cannot get the length* of the array directly.

You can however use the `sizeof(myArray)` function to find out how much memory is allocated.

It is probably best to just remember the length as it must always be constant.