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4 variable, 4 states, bitwise operation

  • Post #1
  • Quote
  • First Post: Feb 24, 2008 3:24pm Feb 24, 2008 3:24pm
I"ve got 4 variable shich can be one of the following states:

ignore
long
short
no trade

I need to do a bitwise type operation on the four variables and return true only if all of them match, excluding any that are "ignore".

Example:

var1: ignore
var2: short
var3: short
var4: short

Result: true

var1: long
var2: long
var3: short
var4: long

Result: false

Etc.

Any ideas?
everytime the value is assigned to a variable increment a counter. 1 counter for short 1 counter for long and 1 for ignore. Then apply the following formula to the equation:

result =false;
if(mathabs(long-short)+ignore)==4)result=true;


in the first example the formula would have worked out to abs(0-3)+1=4 so you would have gotten a true;

the second example would have came out false abs(3-1)+1=3.
Hi magnumfreak,

Interesting twist.

Regards,
lucidlamp
Quoting TraderGeek
I"ve got 4 variable shich can be one of the following states:
[...]
Any ideas?
Hi,

My idea:
Firstly define your states as the following powers of 2:

Inserted Code
#define STATE_IGNORE 1
#define STATE_LONG 2
#define STATE_SHORT 4
#define STATE_NOTRADE 8
Now checking your condition is really simple:

Inserted Code
bool check(int v1, int v2, int v3, int v4) {
    int all = v1 | v2 | v3 | v4 | STATE_IGNORE;
    return ((all == (STATE_LONG | STATE_IGNORE)) ||
        (all == (STATE_SHORT | STATE_IGNORE)) ||
        (all == (STATE_NOTRADE | STATE_IGNORE)));
}
You can test it:

Inserted Code
var1 = STATE_IGNORE;
var2 = STATE_SHORT;
var3 = STATE_SHORT;
var4 = STATE_SHORT;
Print(check(var1, var2, var3, var4));

var1 = STATE_LONG;
var2 = STATE_LONG;
var3 = STATE_SHORT;
var4 = STATE_LONG;
Print(check(var1, var2, var3, var4));

I hope it will help.
Good grief some of you guys make me feel pretty insolent when it comes to programming, able to belt out these solutions that I'd be running into a wall over. this is definitely the right place to look for help!
Never underestimate the powers of the Force.
  • Post #6
  • Quote
  • Last Post: Feb 25, 2008 7:29pm Feb 25, 2008 7:29pm
Great ideas. Thanks to all.
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