ในโปรแกรมนี้ เราหา Find size of array ใน C/C++ โดยไม่ใช้ 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.
ตัวอย่างโค้ด
#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; }ผลลัพธ์
Number of elements in array is 9
