The FSUB function subtracts num2 from num1, expressed as either numbers or as strings, and returns the result. Leading plus signs and leading and trailing zeros are ignored. A string is parsed as a number until a non-numeric character is encountered. Thus “7dwarves” is parsed as 7. If a num value is a null string or a non-numeric value, FSUB parses its value as 0 (zero).
The FSUB function performs a subtraction on two numbers and returns the result. You can perform the same operation using the subtraction operator (-). Refer to the Operators page of this manual.
To perform numeric comparison operations, use the SCMP function, or use the standard comparison operators.
The following example uses the FSUB function to subtract two floating point numbers:
a=11.95 b=10.25 PRINT FSUB(a,b); ! returns 1.7