hey faggots how wuold you switch the value of 2 variables with

>>61243071
Install gentoo

>>61243071
install ubuntu

>>61243071
Do your own homework, fag.

a=b=a;

>>61243080
what a poorfag, ok i hope after this you will stop being butthole and starts talk serious.
when you have to swith to variables you have to declare a dummy variable right? wrong.
i tested this and it works and the program gains performances:
x=-x+(y=x)
your move now...

>>61243112
>swith to variables
switch the value of two variables

>>61243112
>y == x
>x == 0
Fucking idiot.

>>61243124
lol what are you talkin about you learned yesterday to code

Doesn't mean shit bcuz the uC will still use 2 instructions to change its registers values

>>61243138
can you please try it before judging... it works.... i wanted only to spread knowledge

File: 1484974434734.jpg (20KB, 500x281px) Image search: [Google]

20KB, 500x281px

x^=y^=x^=y;

>>61243071

a = 42
b = 69
a = a^b
b = a^b
a = a^b

>>61243130

$ cat test.c 
#include <stdio.h>

int main()
{
    int x = 1, y = 2;

    printf("%d %d\n", x, y);
    x = -x + (y = x);
    printf("%d %d\n", x, y);
}
$ gcc test.c
$ ./a.out
1 2
0 1

>>61243166
it was x=y of course at the beginnig

>>61243166
x=y-x+(y=x)

>>61243112
the most arrogant are always the most ignorant.
that kind of code is incorrect because it can over/underflow.
your code is also identical to a naive version that use temporary storage and three instructions.
you also probably have never heard of the XCHG instruction.
most languages will also first evaluate y=x and return x as the result, so that you get x = -x + x, which means that x = 0 no matter what value x and y have.

>i tested this
haha no you have not

>>61243153
that doesn't require additional storage but is still three instructions.

>>61243160
still three instructions.

x=c + (y=x)
where c is c(x,y) or c is a constant, it doesn't really matter

a, b = b, a

https://en.wikipedia.org/wiki/Assignment_(computer_science)#Parallel_assignment

>>61243071
Unless the ISA your using has an instruction for it, you can't.

>>61243188
oh fuck I thought he wanted with no extra variables, welp.

>>61243188
i misstyped it was x=y-x(y=x)

>>61243185
That's undefined behaviour.
You have multiple uses of the same value (with side effects) that are sequenced relative to each other.

>>61243188
y=x returns 1 as the result in the only good programming language, gtfo pajeet

*you're

swap(&a, &b);

>>61243206
again, that is incorrect you dumb friend. What happens if y is the maximum positive integer and x is the minimum negative integer?

>>61243207
>sequenced
unsequenced, I mean.
It's the same shit as

i = ++i;

>>61243207
at the end of the equation x as the y value and y has the x value

>>61243227
The program is undefined behaviour, therefore invalid.
Any and all output is meaningless.

Either some C nested assignment magic, or many languages have memswap operation.

>>61243071
xchg rax, rbx

File: rekt.jpg (106KB, 611x438px) Image search: [Google]

106KB, 611x438px

>>61243222
>>61243222
i feel like you said things looking into a mirror.
pic related ahaha