get array size code example

Example 1: c++ get length of array

int arr[5];
int len = sizeof(arr) / sizeof(arr[0]);
// returns 5

Example 2: size of an array c

int a[20];
int length;
length = sizeof(a) / sizeof(int);

Example 3: can't find lenght

it's written length not lenght

Example 4: array length c++

#include <iostream>
using namespace std;

#define size(type) ((char *)(&type+1)-(char*)(&type))

int main(){
  int arr[5] = {1, 2, 3, 4, 5};
  cout << size(arr) / size(arr[0]) << endl; //returns 5
  //alternatively
  cout << sizeof(arr) / sizeof(int) << endl; //returns 5
}

Example 5: length of array in java

arr.length;

Example 6: get length of array

// In Javascript
var x = [1,2,3];
console.log(x.length);