|numstr1||The minuend. An expression that resolves to a number or numeric string.|
|numstr2||The subtrahend. An expression that resolves to a number or numeric string.|
The SSUB function subtracts numstr2 from numstr1, 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. Non-numeric strings and null strings are parsed as 0.
To perform numeric comparison operations, use the SCMP function, or use the standard comparison operators.
The following examples use the SSUB function to subtract two numeric strings. All of these examples return 4:
PRINT SSUB(7,3) PRINT SSUB("7","3") PRINT SSUB("+7.00","003") PRINT SSUB("7dwarves","3wishes")
All of the following examples return 7:
PRINT SSUB(7,0) PRINT SSUB("7","") PRINT SSUB("7","three")