c swaping program

Question

1.00/5 (3 votes)

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C++

Java

How to swap two numbers without using third variable?

Posted 5-Oct-10 9:16am

amolapatil88

Updated 15-Jan-18 19:00pm

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Comments

Richard MacCutchan 5-Oct-10 17:44pm

Why would you care?

Dylan Morley 7-Oct-10 9:25am

^ because it's a question on his homework?

Yusuf 7-Oct-10 13:33pm

why can't you figure your own homework. Give me 10 dollars I give you back 1 dollar. You see we swapped dollars with no third party involved.

6 solutions

Solution 3

Only one of the above choices will protect against overflow/underflow.

b = a ^ b;
a = b ^ a;
b = a ^ b;

Posted 7-Oct-10 7:11am

krmed

Solution 2

One more to the list:

// x:4; y:7  
x = x*y;  // 4*7  
y = x/y;  // 28/7 = 4  
x = x/y;  // 28/4 = 7

Posted 5-Oct-10 10:47am

Sandeep Mewara

Solution 4

//why to go for three lines of code when i have single line code

//int a=20;b=10

b=(a+b)-(a=b);

Posted 15-Feb-12 16:45pm

The Doer

Solution 5

x XOR y
y XOR x
x XOR y

(XOR == Exclusive OR for those not familiar with PDP-10 assembly code :))

It is an exercise for the student to write than in their favorite language or C++ or Java or whatever other language tags you feel like adding to this question.

Posted 15-Feb-12 17:15pm

Chuck O'Toole

Solution 6

Dear that's so symple use that code

a=a+b;
b=a-b;
a=a-b;

thats better way of swapping......
without use temporary variable.

Posted 17-Feb-12 6:37am

Pradeep yaduvanshy

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#realJSOP · Accepted Answer · 2010-10-05T09:42:00

Solution 1

Given:

int a = 1;
int b = 2;

You can do this:

a = a + b;
b = a - b;
a = a - b;

or this:

b = a ^ b;
a = b ^ a;
b = a ^ b;

or just use the std:swap method.

Posted 5-Oct-10 9:42am

#realJSOP

Updated 7-Oct-10 3:17am

v2

Comments

thatraja 7-Oct-10 9:19am

Hi john, i just replaced x & y into a & b in your answer which you have forgot, But later i found that i should have changed just the variables a & b into x & y. :-) cheers