[Moved] Doubt on C programming (swapping of variables)

[nthulasiram]

Hi Friends,

how to swap two variables without using third variable without arithmetic operations and without bitwise operator. thanks for helping me.

 

[Y.SAI SARASWATHI]

Re: Doubt on C programming (swapping of variables)

Let the two variables be a,b then code to swap them is
a=a+b;
b=a-b;
a=a-b;
(you can even do it using *,/ operators but it works only for integers.)

 

[nthulasiram]

Re: Doubt on C programming (swapping of variables)

Let the two variables be a,b then code to swap them is
a=a+b;
b=a-b;
a=a-b;
(you can even do it using *,/ operators but it works only for integers.)

Those are arithmetic operations only na.( x = x*y; y = x/y; x = x/y; and a = b -~a-1; b = a+ ~b+1;
a = a+~b+1; and a = a^b; b = a^b; a = b^a

In the above, I mention without arithmetic and without 3rd variable without bitwise operator. how to swap two variables am looking for.

 

[btbass]

Use assembler and the stack,

Push a
Push b
Pop a
Pop b