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http://sandwichc-life.blogspot.com/2007/10/cc-pointer-reference.html

void swap(char &a, char &b)
    {
     char tmp = a;
     a = b;
     b = tmp;
    }

main(void)
        {
         char tempA=10,tempB=20;
         swap(tempA, tempB);
         ........................
        ........................
       }