interchange of variables

[awaismalik82]

Hi all, this is a pretty simple question but has been haunting me for quite sometime now so here goes....How is it possible to interchange the values of two variables without having to store one of their value temporarily? Need an answer quick!

Thanx in advance
Awais

[Oliver Twesten]

Use pointers and swap them instead of the variable values

[Guysl]

consider:
A = 2;
B = 8;

A=A+B; ==> now A=10, B=8
B=A-B; ==> now A=10, B=2
A=A-B; ==> now A=8, B=2

Regards,
Guy

[marsh_pottaye]

Originally posted by Oliver Twesten
Use pointers and swap them instead of the variable values

... and furthermore, use only those pointers, because each variable remains in its initially place.

[Marc G]

What kind of variables do you want to swap?
If these are numeric variables, you can use the xor-swap method:

// swap x and y
x ^= y;
y ^= x;
x ^= y;

or directly use the XCHG i386 opcode

[Andreas Masur]

[Merged threads]

[Napaseredak]

swap(A,B);