Method1) Using temporary variable
         temp=a;
         a=b;
         b=temp
 
 

Method2 ) Using Macro
#define swap(type,a,b) type temp;  temp=a; a=b; b=temp;
 
 

Method3) Using add/subtract
         a=a+b;
         b=a-b;
         a=a+b;
 
 
Method4) Using Multiplication/division
         a=a*b;
         b=a/b;
         a=a/b;
 
 
Method5) Using XOR method
         a=a^b;
         b=a^b;
         a=a^b;
 
 
Method6) Wrong!! Because evaluation of expression can not be guesses
         a=a+b-b=a;