Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Find size of array in C/C++ without using sizeof
In this program, we find out Find size of array in C/C++ without using sizeof.
Algorithm
Begin Initialize the elements of the array. &a => This is the pointer to array which points at the same memory address as a. &a + 1 => It points at the address after the end of the array. *(a+1) => Dereferencing to *(&a + 1) gives the address after the end of the last element. *(a+1)-a => Subtract the pointer to the first element to get the length of the array. Print the size. End.
Example Code
#include <iostream>
using namespace std;
int main() {
int a[] = {6,7,5,3,1,4,2,10,9};
int s = *(&a + 1) - a;
cout << "Number of elements in array is "<< s;
}Output
Number of elements in array is 9
Updated on: 30-Jul-2019
4K+ Views
Advertisements