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4 variable, 4 states, bitwise operation

  • #1
  • First Post: Feb 24, 2008 2:24pm Feb 24, 2008 2:24pm
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?
  • #2
  • Feb 24, 2008 4:10pm Feb 24, 2008 4:10pm
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.
  • #3
  • Feb 24, 2008 5:44pm Feb 24, 2008 5:44pm
Hi magnumfreak,

Interesting twist.

Regards,
lucidlamp
  • #4
  • Feb 25, 2008 7:55am Feb 25, 2008 7:55am
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.
  • #5
  • Feb 25, 2008 6:28pm Feb 25, 2008 6:28pm
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.
  • #6
  • Last Post: Feb 25, 2008 6:29pm Feb 25, 2008 6:29pm
Great ideas. Thanks to all.
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