Swap Two Numbers Without Using Third Variable in C# | C Sharp Interview Questions

Swap two numbers without using third variable using C#.
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[@sandeepchary3602]

If one of them is negative or both Positive numbers
int a,b;
Console.WriteLine("Enter first value");
a=int.Parse(Console.ReadLine());
Console.WriteLine("Enter second value");
b=int.Parse(Console.ReadLine());
Console.WriteLine("a:{0} and b: {1}",a,b);
a=a-(-b);
b=a-b;
a=a-b;
Console.WriteLine("a:{0} and b: {1}",a,b);

[@questpondvideos]

But what if one of them is negative number or infinite number ?... :-) Write down in comment other ways of solving this problem.

[@jayjeckel]

A neat math trick, but, please, don't anybody ever do this in production code, just use a temp variable. There is nothing simpler than t = a; a = b; b = t;. Any tricks you use will almost certainly be slower and will definitely be less maintainable to future developers.

[@suhanavideos3096]

Sometimes interviewer ask this question dear

[@questpondvideos]

I agree so much. But its sad interviewers asks these kind of Questions or they part of aptitude for freshers. As a developer we should follow KIS ( Keep it Simple). But then there is other world out their who hires developers on these criterias. Happy learnig,

[@RajKumar-nh8ko]

X = X+Y
Y = X-Y
X = X-Y