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How to swap values between two variables without using a
third variable?
- 24 Answers
- 48733 Views
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Answer / banti sharma
main()
{
int a,b;
a=a+b;
b=a-b;
a=a-b;
}
in Answer of pinky she has taken a variale ia which is not
used in program. He He He
| Is This Answer Correct ? | 88 Yes | 16 No |
Answer / shobha
int x=10,y=20;
x=x+y (10+20=30)
y=x-y (30-20=10)
x=x-y (30-10=20)
x=20,y=10
x and y vales are swaped.
| Is This Answer Correct ? | 51 Yes | 12 No |
Answer / mona
swap(int var1,int var2)
{
var1=var1+var2;
var2=var1-var2;
var1=var1-var2;
}
thanks for asking.
| Is This Answer Correct ? | 45 Yes | 13 No |
Answer / siva
You can also do it with the exclusive or bitwise operator...
a = a ^ b;
b = a ^ b; ((a ^ b) ^ b == a)
a = a ^ b; ((a ^ b) ^ a == b)
| Is This Answer Correct ? | 27 Yes | 8 No |
Answer / gourab varma
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();
printf("enter value of a and b");
scanf("%d%d", &a,&b);
a=a+b;
b=a-b;
a=a-b;
printf("the value of a=%d\n the value of b is=%d", a, b);
getch();
}
| Is This Answer Correct ? | 8 Yes | 1 No |
How to swap two String values without using a
third variable?
In Java::
=========
String s1 = "Shyam Sundar Baishya" ;
String s2 ="Dilip Kumar";
System.out.println("Before swapping ............");
System.out.println("s3 == "+s1);
System.out.println("s4 == "+s2);
s1= s1+s2;
System.out.println("....................");
System.out.println("After swapping ............");
s2 = s1.substring(0,(s1.length()-s2.length()));
s1 = s1.substring(s2.length(),(s1.length()));
System.out.println("s3 == "+ s1);
System.out.println("s4 == "+ s2);
| Is This Answer Correct ? | 6 Yes | 0 No |
Answer / pushpendra
int x=10,y=20;
x=x+y (10+20=30)
y=x-y (30-20=10)
x=x-y (30-10=20)
x=20,y=10
x and y vales are swaped.
| Is This Answer Correct ? | 13 Yes | 9 No |
Answer / sriram
Hey guys, what about swaping variables contains string
values? All of your solutions will suck... Try this and swap
any datatype without third variable... Happy Sensible Coding..
$v = 'sriram';
$u = 'lakshmi';
$v .= $u;
$u = substr($v,0,(strlen($v) - strlen($u)));
$v = substr($v,(strlen($v) - strlen($u)-1), strlen($v));
echo 'u = ' . $u .'<br>';
echo 'v = ' . $v;
| Is This Answer Correct ? | 8 Yes | 4 No |
Answer / vinodkumar
main()
{
int a=10,b=8;
void swap(a,b)
/*it does not return any value because return statement can
return only one value at a time*/
{
a=a+b;/*a=10+8,a=18*/
b=a-b;/*b=18-8,b=10*/
a=a-b;/*a=18-10,a=8*/
printf("after swaping a= %dand b=%d",&a,&b);
}
getch()
}
| Is This Answer Correct ? | 5 Yes | 2 No |
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In Bioinformatics, a DNA sequence is made up of a combination of 4 characters, namely “A,C,G,T”. A subsequence of a given sequence of characters a0, a1, …an- 1, is any subset of the characters taken in order, of the form ai0 , ai1 ,…..aik-1 where 0 ≤ i0 <i1….< ik-1 ≤ n-1. For example in the sequence “A,C,G,T,G,T,C,A,A,A,A,T,C,G”, we can have subsequences “A,G,T”, “A,C,A,A” and many more. A subsequence is palindromic if it is the same whether read left to right or right to left. For instance, the sequence “A,C,G,T,G,T,C,A,A,A,A,T,C,G”, has many palindromic subsequences, including “A,C,G,C,A” and “A,A,A,A” (on the other hand, the subsequence “A,C,T” is not palindromic). Devise an algorithm (using dynamic programming) that takes a sequence of characters X[0 … n-1] from the alphabet set (A,C,G,T) and returns the (length of the) longest palindromic subsequence. Implement the algorithm in an appropriate language.
C 
