How to Find size of Array in C, C++

How to find the size of an array in C and C++.


Let's first declare an array.

int arr[]={4,2,3,1,6,7};

/* Take the memory allocated by whole array divided by
   the memory allocated of a single element in an array. */

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

// Now len contains the size of array.

How to Find size of Array in C, C++

#include<stdio.h>

int main(){

  int arr[]={4,2,3,1,6,7};
  
  int len = sizeof(arr)/sizeof(arr[0]);
  
  
  printf("Size of an array is %d ",len);
  
  return 0;

}

C, C++ Interview Questions

  C++ Code

#include <iostream>

using namespace std;

int main() {
 
 
 int arr[]={4,2,3,1,6,7};
  
   int len = sizeof(arr)/sizeof(arr[0]);
  
  
   cout<<"Size of an array is " <<len;
  
   return 0;
  
}

Output :

Size of an array is 6.