what will the out be ? And why ?!

Question

#include<iostream>
using namespace std ;
int main ()
{
int x=3 ,y=1 ;
x = y+++x ;
y = --y+x-y ;
cout<< x << y ;
return 0 ;
}

Answer 1

x = 4 ,y = 4
on line x= y++ + x
here y = 1 and x = 3 become 4 and y increment bt 1

on line y=--y+x-y
here y =2 x=4
first y is decremented and then calculation done
y = 1+4-1
y=4

Answer 2

Read more about "Prefix" and "Postifx" incrementors / decrementors.