Logical error in code

#1

int RangeOfBits(int n,int i,int j)
{
int mask = (~0)<<(j+1);
int end = (1<<(i+1))-1;

mask = mask+end;

return n&mask;

}

this code is giving me incorrect answer. pls point out the mistakes in my code

#2

you don’t have to add these
instead take “OR” of both the masks

mask = mask || end;