Swapping 2 No.s without using 3rd variable

Batman · 02-08-07, 10:00 PM

Hi, can any1 tell me how to write a swapping of 2 no.s prog in c/c++ by using only 2 variables... Urgent reqd...

udayc · 03-08-07, 12:18 AM

take 2 vaiables a and b and the logic goes this way
a=a+b;
b=a-b;
a=a-b;
check it out.

**sk_kireeti** · 03-08-07, 12:30 PM

Please refer this thread which points to all posts which discuss the same issue.

How many temp variables are required to swap two numbers?

Thanks,
Krishna

gouriproutray · 16-09-07, 12:19 AM

Swapping 2 No.s without using 3rd variable
take 2 vaiables a and b and the logic goes this way

a=0001010=10
b=0101001=41
a=a^b;
b=a^b;//b=10
a=a^b;//a=41

gouri p. routray

02-08-07, 10:00 PM	#1 (permalink)
Batman Junior Member Join Date: Aug 2007 Age: 21 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 2	Swapping 2 No.s without using 3rd variable Hi, can any1 tell me how to write a swapping of 2 no.s prog in c/c++ by using only 2 variables... Urgent reqd...

03-08-07, 12:18 AM	#2 (permalink)
udayc Junior Member Join Date: Jul 2006 Location: hyderabad Age: 24 Posts: 27 Thanks: 1 Thanked 0 Times in 0 Posts Thanks: 1 Thanked 0 Times in 0 Posts Rep Power: 3	Re: Swapping 2 No.s without using 3rd variable take 2 vaiables a and b and the logic goes this way a=a+b; b=a-b; a=a-b; check it out. __________________ uday

03-08-07, 12:30 PM	#3 (permalink)
sk_kireeti Super Moderator Join Date: Feb 2006 Location: Hyderabad Posts: 2,355 Thanks: 117 Thanked 241 Times in 198 Posts Thanks: 117 Thanked 241 Times in 198 Posts Blog Entries: 4 Rep Power: 51	Re: Swapping 2 No.s without using 3rd variable Please refer this thread which points to all posts which discuss the same issue. How many temp variables are required to swap two numbers? Thanks, Krishna __________________ Give 1 cup rice to a hungry Indian just by a mouse click. No money, no form filling, no hassle... Click here for the donation.

16-09-07, 12:19 AM	#4 (permalink)
gouriproutray Junior Member Join Date: Sep 2007 Age: 25 Posts: 16 Thanks: 1 Thanked 0 Times in 0 Posts Thanks: 1 Thanked 0 Times in 0 Posts Rep Power: 2	Re: Swapping 2 No.s without using 3rd variable Swapping 2 No.s without using 3rd variable take 2 vaiables a and b and the logic goes this way a=0001010=10 b=0101001=41 a=a^b; b=a^b;//b=10 a=a^b;//a=41 gouri p. routray

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