Questions about if statements (C ++ VS javascript)

I recently switched to c ++ and developed some c ++ projects. I am familiar with the js language features and have encountered great difficulties in programming, the most confusing issue is the issue of conditional judgment. Here we will compare it with c ++ and js. First, let's take a look at several tests. Test 1. c ++ source code: [cpp] int test () {printf ("test \ n"); return 1 ;}int main () {int I = 0; if (I & test () printf ("ok1"); else printf ("ok2");} running result: [cpp] view plaincopytest ok2 test II. js source code: [javascript] function test () {console. log ("test"); return 1 ;}var I = 0; if (I & test () console. log ("ok1"); else console. log ("ok2"); running result: [javascript] ok2 in principle, although I = 0 for the if condition, regardless of the result returned by the test function, it is 0 (false) after the operation, and the result should be "ok2", and the two languages operate completely on this mechanism. Obviously, c ++ has done a lot of useless work. Next let's take a look at the or operation. Test 3. c ++ source code: [cpp] int test () {printf ("test \ n"); return 0 ;}int main () {int I = 1; if (I | test () printf ("ok1"); else printf ("ok2");} running result: [cpp] ok1 test 4. js source code: [javascript] function test () {console. log ("test"); return 0;} var I = 1; if (I | test () console. log ("ok1"); else console. log ("ok2"); running result: [javascript] ok1 has the same or operation mechanism as c ++ and js. When the first condition is true, the result of the test function is no longer judged. I am confused, so I will test c # again. Test v. c # source code: [csharp] using System; using System. collections. generic; using System. componentModel; using System. data; using System. drawing; using System. linq; using System. text; using System. windows. forms; namespace WindowsFormsApplication1 {public partial class Form1: Form {public Form1 () {InitializeComponent () ;}string con = ""; bool test () {con + = "test "; return true;} private void button1_C Lick (object sender, EventArgs e) {con = ""; bool I = false; if (I & test () con ++ = "ok1 "; else con + = "ok2"; MessageBox. show (con) ;}} running result: c # has the same mechanism as js. The reason for this comparison is that if two conditions A, B, A, and B are both set up to do one thing, and A is not set up to B, then Javascript is used, the statement can be written in this way: [javascript] if (A & B) {} else {} When A is not successful, B is naturally not judged, so the running efficiency is not affected, however, if c ++ is used for writing, both conditions will be judged, and the efficiency will be affected. Therefore, you have to write: [cpp] if (A) {if (B) {} else {} Here is a summary of the confusions encountered during development. As for the deep-seated problems of the two languages, I cannot clearly explain them.