Answer / p.muthukumar

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

Answer / 3uggy3oy

Answer #16 is totally wrong it fails
when x>y and many other situation.

Answer / alex

When swapping integers or characters, use:
a^=b;
b^=a;
a^=b;
When swapping floats or doubles use:
a+=b;
b=a-b;
a=a-b;
When swapping strings use:
a=(char*)((int)a^(int)b);
b=(char*)((int)a^(int)b);
a=(char*)((int)a^(int)b);
This works by modifying the address values of the pointer.

Answer / shubham

NOne of the answer is correct except the 2ND one.....Please
don't give wrong answers.

Answer / hanmanth reddy

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

Answer / bhaskar.mantrala

void main()
{
int a,b;
clrscr();
printf("\n Enter the values of a and b ");
scanf(" %d %d ", &a,&b);
a=a*b;
b=a/b;
a=a/b;
printf("\n \n After swapping ----> a = %d \t b = %d",a,b);
getch();
}

Answer / trinath somarouthu

using X-OR
#define SWAP(x,y) x^=y^=x^=y

x = x ^ y --> x^=y -- (1)
y = y ^ x --> y^=x -- (2)
x = x ^ y --> x^=y -- (3)

(3) in (2) --> y^=x^=y -- (4)
(4) in (1) --> x^=y^=x^=y -- :-)

all togeather, he single line code

#define SWAP(x,y) x^=y^=x^=y

Answer / sunil kharat

a^=b^=a^=b;

try it...
it works. one line solution

Answer / sujata

i think first is right.

Answer / perl guru

($a,$b)=($b,$a)
....this is how we do in PERL....Ha Ha Ha pretty cool !!!!

And BELIEVE me it works not only for NUMBERS but also for
STRINGS, ARRAYS or any Data Structure or any garbage
value....this is mine Challenge.....

None of the any programming language can come close to PERL
in this much of SIMPLICITY and ROBUSTNESS....just one line
does the Magic....

Again I would say the Question itself is very silly one "How
to swap two variables, without using third variable
?"....and I see alot of stupid Answers posted here....

Everyone posting the answer is assuming that Question is
about swapping INTEGER NUMBERS....I would like to ask what
if I provide FLOATING POINT NUMBERS, NEGATIVE NUMBERS, REAL
NUMBERS, and surely it does not work for STRINGS....

That is why I say "Perl is immensely powerful. If you think
something can't be done, the problem is likely to be it is
beyond your ability, not that of Perl."

Welcome to the world of PERL....its more precious than PEARL....

main() { int (*functable[2])(char *format, ...) ={printf, scanf}; int i = 100; (*functable[0])("%d", i); (*functable[1])("%d", i); (*functable[1])("%d", i); (*functable[0])("%d", &i); } a. 100, Runtime error. b. 100, Random number, Random number, Random number. c. Compile error d. 100, Random number

1 Answers   HCL, rsystems,

main() { int c=- -2; printf("c=%d",c); }

1 Answers   TCS,

main() { int i=5; printf("%d%d%d%d%d%d",i++,i--,++i,--i,i); }

7 Answers  

Write a program that produces these three columns sequence nos. using loop statement Sequence nos. Squared Squared + 5 1 1 6 2 4 9 3 9 14 4 16 21 5 25 30

1 Answers   GoDB,

Given an array of size N in which every number is between 1 and N, determine if there are any duplicates in it. You are allowed to destroy the array if you like.

21 Answers   ABC, eBay, Goldman Sachs, Google, HUP, Microsoft, TATA,

/*what is the output for*/ void main() { int r; printf("Naveen"); r=printf(); getch(); }

4 Answers  

#define SQR(x) x * x main() { printf("%d", 225/SQR(15)); } a. 1 b. 225 c. 15 d. none of the above

3 Answers   HCL,

program to Reverse a linked list

12 Answers   Aricent, Microsoft, Ness Technologies,

Implement a t9 mobile dictionary. (Give code with explanation )

1 Answers   Amazon, Peak6, Yahoo,

Sorting entire link list using selection sort and insertion sort and calculating their time complexity

1 Answers   Infosys, Microsoft, NetApp,

Cau u say the output....?

1 Answers  

What is data _null_? ,Explain with code when u need to use it in data step programming ?

0 Answers   Abbott,