how to extract character on the right

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Hi,

I’ve got some variables

Int var1= 12.598

Int var2 = 96.325

Int var3=12544.3658882

Int var4=9865.010144

How can I extract the last 2 characters on the right (98 , 25 or 82 etc.. )

With the function « StringSubstr »?

Because StringSubstr (var1,0,2) =12

Thanks for all your help!

 
natsirte:

Hi,

I’ve got some variables

Int var1= 12.598

Int var2 = 96.325

Int var3=12544.3658882

Int var4=9865.010144

How can I extract the last 2 characters on the right (98 , 25 or 82 etc.. )

With the function « StringSubstr »?

Because StringSubstr (var1,0,2) =12

Thanks for all your help!

First, your StringSubstr works only with string, your variables are not string.
Second, any numbers stored into an integer variables will be truncated, removing the fraction.

So you should use something like below:
double dVar = 12544.3658882;
string sVar = StringConcatenate( dVar );
string subSVar = StringSubstr( sVar, StringLen(sVar)-2 );
Print( subSVar );
 
fireflies:
natsirte:

Hi,

I’ve got some variables

Int var1= 12.598

Int var2 = 96.325

Int var3=12544.3658882

Int var4=9865.010144

How can I extract the last 2 characters on the right (98 , 25 or 82 etc.. )

With the function « StringSubstr »?

Because StringSubstr (var1,0,2) =12

Thanks for all your help!

First, your StringSubstr works only with string, your variables are not string.
Second, any numbers stored into an integer variables will be truncated, removing the fraction.

So you should use something like below:
double dVar = 12544.3658882;
string sVar = StringConcatenate( dVar );
string subSVar = StringSubstr( sVar, StringLen(sVar)-2 );
Print( subSVar );


Good thinking, man. Only one mistake in the substring function, which has three parameters, so I think the correct operation is as follows:

string subSVar = StringSubstr( sVar, (StringLen(sVar)-2), 2 );
 
Not really. Without the 3rd parameter means taking the rest of the string. Try it.
 
fireflies:
Not really. Without the 3rd parameter means taking the rest of the string. Try it.
"Length of the substring extracted. If the parameter value exceeds or equals to 0 or the parameter is not specified, the substring will be extracted starting from the given position and up to the end of the string."

My mistake :).
 

Hi

Thanks you for your help

But I've got the message below

")" Wrong parameter count

// for string sVar = StringConcatenate( dVar );

How can I do please

Best regards

 
natsirte:

// for string sVar = StringConcatenate( dVar );

Sorry, try this:
string sVar = "" + dVar;
 
fireflies:
natsirte:

// for string sVar = StringConcatenate( dVar );

Sorry, try this:
string sVar = "" + dVar;

Hi

The result is : 00

if I write "string subSVar = StringSubstr( sVar, StringLen(sVar)-6 );"

the result is : 590000

Why?

Best Regards

 

Howdy natsirte

how bout this?

seems bit long winded but getting at digits is fiddly imho. MQL4 casts double to destination string with 8 string digits after decimal point. The loop starts at right moving left long as '0' seen. It will stop when only 2 chars are left to look at (as you wanted rightmost 2, seemed place to cut losses and run :) If sees any char other than '0' it gives up. The if(..) at end decides if can return substring containing the next 2 leftmost digits. Not completely foolproof but could be basis for ideas?

Seems totally over the top but is best I could come up with - it works... and guess that might mean something - lol

string sfGet2RightMostDigits(double d)
{
    string s = d;
    int iPos = StringLen(s)-1;
    int iChar;
    while( iPos >= 1 )
    {
        iChar = StringGetChar(s,iPos);
        if( iChar != '0' ) break;
        iPos--;
    }
 
    if( iPos >= 1 && iChar != '.' && StringGetChar(s,iPos-1) != '.' )
        return( StringSubstr(s,iPos-1,2) );
 
    return("");
}
//------------------------------
int start()
{
    //some numbers - anything valid can be tested out...
    double da[]={12.598,96.325,12544.3658882,9865.010144,1.23,12345.67890123,1.2,23.0};
 
    for(int i=0;i<ArraySize(da);i++)
    {
        string s = da[i];
        //log number as string + (2 rightmost digits OR empty string)
        Print(s,",  \"",sfGet2RightMostDigits(da[i]),"\"");
    }
 
    return(0);
}

edit forgot to include test o/p:

2007.09.15 00:14:31 testBed GBPUSD,M15: removed
2007.09.15 00:14:31 testBed GBPUSD,M15: 23.00000000, ""
2007.09.15 00:14:31 testBed GBPUSD,M15: 1.20000000, ""
2007.09.15 00:14:31 testBed GBPUSD,M15: 12345.67890123, "23"
2007.09.15 00:14:31 testBed GBPUSD,M15: 1.23000000, "23"
2007.09.15 00:14:31 testBed GBPUSD,M15: 9865.01014400, "44"
2007.09.15 00:14:31 testBed GBPUSD,M15: 12544.36588820, "82"
2007.09.15 00:14:31 testBed GBPUSD,M15: 96.32500000, "25"
2007.09.15 00:14:31 testBed GBPUSD,M15: 12.59800000, "98"
2007.09.15 00:14:31 testBed GBPUSD,M15: loaded successfully

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