Hello,
many times in interviews, A quesion is being asked that "How to swap two values with out using thrid variable".
We know how to swap using thrid vaiable i.e.
a=10;
b=20;
c=0;
c=a;
a=b;
b=c;
Now, if you want to swap two string variables without using third variable use
string A= "string A";
string B= "string B";
A+=b;
B = A.substring(0,A.Length-B.Length);
A = A.substring(B.Length);
in order to swap two integer values you can do the same as
int a = 10;
int b = 20;
A = A+B;
B = A-B;
A = A-B;
OR
A = A ^ B;
B = A ^ B;
A = A ^ B;
but there are exception in using the first option in swaping integer values. second will always give you the result, but sometimes first will result in over/under flow.
check it yourself.
