Brian Dunning's FileMaker Custom Functions

BaseConvert ( string ; baseFrom ; baseTo )

Convert a number (up to 10 billion) from one base to another.

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Debi Fuchs   Debi Fuchs - Show more from this author
Aptworks Consulting
http://www.aptworks.com

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  Sample input:
BaseConvert ( "F1"; 16; 2 )
  Sample output:
"11110001"

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

CUSTOM FUNCTION: BaseConvert ( string ; baseFrom ; baseTo )
//written by Debi Fuchs of Aptworks Consulting, debi@aptworks.com
//bug fix by Rico Meier, MeiSol AG

Convert a number (up to 10 billion) from one base to another.

EXAMPLES:

BaseConvert( "F1"; 16; 2 ) // --> "11110001"
BaseConvert( -5; 10; 2 ) // --> "-101"
BaseConvert( 255; 10; 16 ) // --> "FF"
BaseConvert( "-101" ; 2; 10 ) // --> "-5"
BaseConvert( -101 ; 2; 10 ) // --> -5
BaseConvert( "FF"; 16; 10 ) // --> "255"
BaseConvert( "-101" ; 16; 2 ) // --> "-100000001"
BaseConvert( "-101" ; 2; 16 ) // --> "-5"
BaseConvert( "FF"; 16; 2 ) // --> "11111111"

IMPLEMENTATION: See comments. No helper functions are required. Limit is set at 10^10 so that the math does not break down, as log calculations on large numbers can be incorrect.

LAST MODIFIED: 22-JUL-2019 by Debi Fuchs of Aptworks Consulting

 

Comments

Rico Meier   Rico Meier, MeiSol AG
Jul 1, 2019
To avoid an error by submit BaseConvert( "00"; 16; 2 ) -> 0?

change this:
// Return a 0 value if the string represents 0;
string = 0 or string = "0";
Case( baseTo=10; 0; "0" );

to
// Return a 0 value if the string represents 0;
getasnumber (string) = 0 or string = "0";
Case( baseTo=10; 0; "0" );

thanks
 
Rico Meier   Rico Meier, MeiSol AG
Jul 2, 2019
Sorry, this will not working because "AB"; 16; 2 will get -> 0.

change to:
// Return a 0 value if the string represents 0;
( length (string) = patternCount ( string; "0") and GetAsNumber (string) = 0 ) or string = "0";
Case( baseTo=10; 0; "0" );
 
Debi Fuchs   Debi Fuchs, Aptworks Consulting
Jul 22, 2019
Thanks, Rico, for finding that bug. I've edited the function and given you credit within it.
 

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