How to swap the content oftwo variables without a temporary variable

Questions by udaykalai   answers by udaykalai

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sivasubrmaniam

  • Mar 29th, 2006
 

x = x + yy = x - yx = x - y

Sharath

  • Mar 31st, 2006
 

void swap(int a,int b)

{

a =a+b;

b=a-b;

a=a-b;

}

amit kumar

  • Mar 31st, 2006
 

x=x+y

x=(x+y)-x;

y=(x+y)-x;

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sanesh raj

  • Mar 31st, 2006
 

x = x + yy = x - yx = x - y

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Geeta.Sanikop

  • Apr 3rd, 2006
 

Hello!!It can be done by calling a Function with the concept of Pointers.Also its done using ^ operator.Just try it!!

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meeran

  • Apr 12th, 2006
 

# include#includemain(){void swap(int*,int*);int a,b;puts("enter the number to swap");scanf("%d",&a);scanf("%d",&b); swap(&a,&b);printf("%d,%d",a,b);getch();}void swap(int*a,int*b){*a=*a+*b;*b=*a-*b;*a=*a-*b;return;}

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Yada Kishore

  • Apr 12th, 2006
 

Swapping two ints x,y using XORx = x ^ y;y = x ^ y;x = x ^ y;

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ganapathy

  • Apr 16th, 2006
 

hi,

#include<stdio.h>

main()

{

int a,b;

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

}

ZZ

  • Apr 23rd, 2006
 

Cannot use y=x+y x=y-x y=y-x

because it may be beyond the rang of the variable.

always uses XOR version

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smithi

  • May 6th, 2006
 

the most easy logic for swap is:

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

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lappy

  • May 9th, 2006
 

this will fail if either x or y is 0

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Mahendar

  • May 22nd, 2006
 

hello everyone....nice to see the solutions from u guys............i have one question for u all, hw du u swap two variables (having string contents) without making use of any third variable ???? try to find it out ...!!!

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Chieh Haan

  • May 26th, 2006
 

how to usw a Function with the concept of Pointers to deal with this problem?I think it will confront with the problem of overflowed.

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ARUNESHWAR

  • Jul 8th, 2006
 

we can swap in the following ways:

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

2.b=a+b;a=b-a;b=b-a;

3.b=a^b;a=a^b;b=a^b;

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gpreddy

  • Nov 8th, 2006
 

This won't work if any one of two nymbers is 0

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ramsoi

  • May 15th, 2008
 

Using XOR, we can swap two numbers. we use pointers as we can only return one number, to return two numbers, we must pass by reference. The following code is in C. 

void XOR_SWAP (int *a, int *b)
 {
     if (a != b) 
     {
         *a ^= *b;
         *b ^= *a;
         *a ^= *b;
     }
 }

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paragmalshe

  • May 29th, 2008
 

if(a>=0&&b>=0||a<0&&b;<0)
{
    if(a>=b)
    {
     a=a-b;
     b=a+b;
     a=b-a;
    }
    else
   {
    b=b-a;
    a=a+b;
    b=a-b;
   }
}
else
{
a=a+b;
b=a-b;
a=a-b;
}

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