Category:LSL Float

float min = 1.175494351E-38;
float max = 3.402823466E+38;
float sci = 2.6E-5;
float sci_a = 2.6E+3;
float sci_b = 2.6E3;
float sci_c = 26000.E-1;
float f = 2600;//implicitly typecast to a float
float E = 85.34859;
float Infintity = (float)"inf"; //-- may be negative, will cause a math error if evaluated in LSO, see 'caveats' below
float NotANumber = (float)"nan"; //-- may be negative, will cause a math error if evaluated in LSO, see 'caveats' bleow

If you need to validate an arbitrary float without limitations then the following function is ideal:

integer isValidFloat(string s) { return (string)((float)s) != (string)((float)("-" + llStringTrim(s, STRING_TRIM_HEAD))); }

However, the following is more efficient, but comes with the noted caveats. If these are not an issue to you then it is the recommended option, particularly under Mono:

integer isValidFloat(string s) { return (float)(s + "1") != 0.0; }

Caveats:

• Under LSO-LSL scientific notation with an exponent greater than 38 will fail (throw a Math Error). Mono is unaffected as it supports infinity
• Under both Mono and LSO-LSL you may find strange results if dealing with strings containing more than 9 decimal places. Remember that string casting in LSL only gives up to 6 so is safe, and human input is rarely going to be that accurate, plus values that small are not usually all that useful.
• "nan", "inf" and their negatives are special text values that can be cast from a string (with any leading spaces or trailing characters). those values will cause a math error when the variable is evaluated in LSO. If you are parsing user data, by casting a string to a float, use the following code (replacing vStrDta with your string variable name) see SVC-6847

  • (float)llList2String( llParseStringKeepNulls( llToLower( llStringTrim( vStrDta, STRING_TRIM ) ), ["inf", "nan"], [] ), 0 )

Articles

• LSL Examples: Format Decimal
• LSL Examples: Float2String