Solution in Java
			
first = second - first;  // first = oldsecond - oldfirst
second = second - first;  // second = oldsecond - (oldsecond - oldfirst) = oldfirst
first = first + second;  // oldsecond - oldfirst + oldfirst = oldsecond 
    
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first = second - first;  // first = oldsecond - oldfirst
second = second - first;  // second = oldsecond - (oldsecond - oldfirst) = oldfirst
first = first + second;  // oldsecond - oldfirst + oldfirst = oldsecond