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
}c++ array with variable size
int n = 10;
double* a = new double[n]; // Don't forget to delete [] a; when you're done!Copyright © 2021 Codeinu
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