C/C++ simple challenge

[shoegoe]

we all know how to swap numbers in a program..

BUT we use a variable temp/like that to store the initial value..

can the same be done without using a TEMP variable?

 

[cg84]

very simple...
take 2 nos. x & y and do the following:
x=x+y
y=x-y
x=x-y
and ur nos r swapped...

 

[sujithtom]

That was a cool idea. How about manipulating fuctions???

 

[cg84]

That was a cool idea. How about manipulating fuctions???

what??? didnt get ur question...

 

[sms_solver]

cg84 from where did you find this solution?

take 2 nos. x & y and do the following:
x=x+y
y=x-y
x=x-y

 

[alib_i]

its very old question !!

there are many more answers possible
x= x*y
y= x/y
x= x/y

 

[NikhilVerma]

Ok now here is another simple one....

Do the same swapping with strings... without using temp variable...

 

[cooljeba]

very simple...
take 2 nos. x & y and do the following:
x=x+y
y=x-y
x=x-y
and ur nos r swapped...

this is the best way to do it with out using a temp variable


..:: peace ::..
jeba

 

[vysakh]

c++

if you have c++ programs please mail me
vysakh007@gmail.com

 

[alib_i]

Write the smallest C program which prints itself.

 

[swatkat]

main()
{
getche();
}
How about this?

 

[lamrinnirmal]

That was a cool idea. How about manipulating fuctions???

you mean manipulating program execution flow?as in the main calls function A but you wanna call B, without B(); anywhere in the program?

 

[alib_i]

main()
{
getche();
}
How about this?

dont know the answer ..
but i dont think that's correct

 

[shoegoe]

O...

 

[cnukutti]

What is the thing about manipulating functions??
and what do you mean by printing itself.
should it read the .c file and print the source code???

 

[swatkat]

"Write the smallest C program which prints itself."
What do you mean by this?

 

[DKant]

Ok now here is another simple one....

Do the same swapping with strings... without using temp variable...

Simple? Well I dunno. Sumthin' with pointers? But I don't see how u can do any manips on pointers.

Apart from that, swapping without temps isn't fool-proof. For example, if ur dealing with 2 integers of the order of 32767/65535 (basically sumwhere close to the max.) , then u cld run into problems.

 

[alib_i]

@swatcat ...
frankly speaking .. even i dont know ... this exactly was a problem statement in one programming contest long time back ..
i still dont know wht it means and how to solve it

 

[vysakh]

i give up
whats the answer???

 

[shoegoe]

very simple...
take 2 nos. x & y and do the following:
x=x+y
y=x-y
x=x-y
and ur nos r swapped...

Ths...
BUT

How to swap more than 2 variables .....
(DONT TELL ME TO USE THE SAME CODE FOR EACH 2 SWAPS

ANSWERS??