c++ why does ((1 / 2) * 2) return 0 -

this question has answer here:

• why division result in 0 instead of decimal? 6 answers
• integer division 0 [duplicate] 1 answer

first time i'v posted here must know what's wrong simple peace of code:

#include <iostream>  using namespace std;  int main() {     double test = (1 / 2) * 2;     cout << test << endl;     return 0; } 

when ever run code displays 0, should casting something, happens regardless of compiler use , returns stranger results if '1' divided form of decimal.

because in integer maths 1 / 2 == 0 , 0 * 2 == 0.

try 1.0 , 2.0 instead.