Swaping Values

[Ali Rizwan]

I have two variables suppose a an b of integer type.
Now i want to swap their values.
Suppose if a =10 and b=5 then a=5 and b=10
But not want to declare another variable like

temp=a
a=b
b=temp

i don't want to use this style.

I have done a lot of things but sometime it only swap when first value is bigger than 2nd and only for when both values are evene or values are even odd if i input both odd nothing done.

and i have not the code yet have done it in my univ.
So somebody can help me
Thanx

[pp08]

Hi

To Swap to value (let a =10 & b =5 to a = 5 & b = 10) u can follow following process without using 3rd variable as u have done (temp)

a = a+b;

b = a-b;

a = a-b;

Hope this will help some..

Best Regards,
PP

[femina]

you could also use bitwise xor ^ operator in swapping two numbers without an intermediate variable

    a      b    output
    0      0       0
    0      1       1
    1      0       1
    1      1       0

int main()
{
int a=10,b=20;
a=a^b;
b=b^a;
a=a^b;
printf("%d   %d",a,b);
}

[Ali Rizwan]

Hi

To Swap to value (let a =10 & b =5 to a = 5 & b = 10) u can follow following process without using 3rd variable as u have done (temp)

a = a+b;

b = a-b;

a = a-b;

Hope this will help some..

Best Regards,
PP

Thanx for the reply
But i think this will only work for those in which one value will half of other suppoes
4 and 8
3 and 6
but not for
3 and 8
But ill try it hope this will worj=k

Thanx
>> Ali <<

[pp08]

Hi Ali,

Let me explain the swapping code according to ur values i.e. a=3 & b =8

a = a + b (in this case a value = 11, correct but B is same as usual so b =8)

b = a - b (as a= 11 and b =8, so a-b =3 is now the value of b)

a = a-b (as a= 11 and b =3 , so a-b =8 is now the value of a)

so atlast we got a = 8 and b = 3

Hope this will give a clear picture..

Have A nice time
Thanks
pp

[vinaykk]

This is case is also works for ur question.

a=a*b;
b=a/b;
a=a/b