Wrong answer in Xor PRofit Problem

#1

what is wrong in my code?
#include
using namespace std;

int main() {

int x,y;
cin>>x;
cin>>y;

int a=x;
int b=y;
int xr;
int max=0;
while(a<=b){
xr=a^b;
a++;
b–;
if(xr>max){
max=xr;
}
}

cout<<max<<endl;

return 0;
}

#2

@anikcode hey aniket your code is not giving right output for this senario like
1
1000
your output is 1001
but expected output is 1023

#3

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