1. Generally, where a numeric type is required, a string type can be supplied. If the character data turns out not to be numeric in form, a conversion error will occur.

2. Generally, where a string type is required, a numeric type can be supplied. This is the case for all integers, decimal, and all floats.

3. When an operator combines two values of the same data class, string or number, then the following precedence, shown from highest to lowest, is followed:

4. The exception to Rule 3 is the "+" operator, which is an arithmetic operator as well as a concatenation operator for strings. The two modes coexist, but if a number is added to a string, then the result type is a number.

5. Mixed type comparisons between character and numeric data are virtually coerced into Numeric String data before being compared.