Swapping Two Variables without Temp Variable

[Adrian]

Is it possible to swap two variables even wiithout using a temporary variable? If so, how is it done?

[zsk_00]

for integers x and y
x=x+y
y=x-y (now y has original x value)
x=x-y (now x has original y value)

[Allan]

Hi,
You can do the swapping of two variables without using third variable in number of ways. One of the simple approaches of doing this is given below:
main( )
{
int a,b;
a=a+b;
b=a-b;
a=a-b;
printf("%a=%d b=%d",a,b);
}

For example if a=5,b=7 then above gets executed as
a=a+b becomes a=12
then b=a-b becomes b=12-7 = 5
again a=a-b becomes a= 12-5 = 7
Thus a=7 and b-5 value is swapped without using third variable.

Regards,
Allan

[silvan]

Hi,

One more method of doing the swapping is using the bitwise operators,

main()
{
int a,b;
a^=b; // a=a^b;
b^=a; // b=b^a;
a^=b; // a=a^b;
}

Regards
Silvan

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[sammy]

To add to this discussion of Swapping Two Variables without Temp Variable one more way of doing this is to use the concept of pointers and achieve this.