CPP

size of array

#include <bits/stdc++.h>
using namespace std;     
int main()
{
    int arr[] = {1, 2, 3, 4, 5};
    int n = sizeof(arr)/sizeof(arr[0]);
    return 0;
}

size of array

// Alternately, use the containers from the STL, e. g. std::array or std::vector. 
// These containers behave very similar to standard arrays, but you can query their 
// size at runtime, no problem.


std::vector<int> array;
array.pushback(2);
array.pushback(7);
array.pushback(344);
array.pushback(45);
array.pushback(89);
array.pushback(28);
std::size_t length = array.size(); // easy!

size of array

int array[] = {4,78,3,7,9,2,56,2,76,23,6,2,1,645};
std::size_t length = sizeof(array)/sizeof(int); // see solution 1

size of array

#include <stdio.h>
#include <stdlib.h>

void printSizeOf(int intArray[]);
void printLength(int intArray[]);

int main(int argc, char* argv[])
{
    int array[] = { 0, 1, 2, 3, 4, 5, 6 };

    printf("sizeof of array: %d
", (int) sizeof(array));
    printSizeOf(array);

    printf("Length of array: %d
", (int)( sizeof(array) / sizeof(array[0]) ));
    printLength(array);
}

void printSizeOf(int intArray[])
{
    printf("sizeof of parameter: %d
", (int) sizeof(intArray));
}

void printLength(int intArray[])
{
    printf("Length of parameter: %d
", (int)( sizeof(intArray) / sizeof(intArray[0]) ));
}

size of array

If all you have is the pointer to the first element then you can't:

int array[6]= { 1, 2, 3, 4, 5, 6 };
void main() 
  {
  int *parray = &(array[0]);
  int len=sizeof(array)/sizeof(int);
  printf("Length Of Array=%d
", len);
  len = sizeof(parray);
  printf("Length Of Array=%d
", len);
  getch();
}
// output: Will give two different values: 6, and 4.

size of array

// If you have s statically allocated array, you can determine the number of elements
//from the arrays name. However, if that is the case, and you don't use C++ functionality,
//then most likely there wouldn't be a need for this in the first place.

int array[10];
std::size_t length = 10; // big surprise, that number is right in the definition!

Size Of Array

<?php

$array = array(
    "f" => "f",
    "b" => "b",
);
print(sizeOf($array))
?>

get array size

// C++ program to find size 
// of an array by using a 
// pointer hack
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    int arr[] = { 1, 2, 3, 4, 5, 6 };
    int size = *(&arr + 1) - arr;
    cout << "Number of elements in arr[] is " << size;
    return 0;
}