Crystal Report Formula Default Value for NULL

Crystal Report formula generally used to Count, Summarize, or any other Arithmetic function in Crystal Report. Depends on query result, the value for one of the field either NULL or NOT NULL. The problems are: Formula in Crystal Report wouldn’t count or do any arithmetic function, if the component of the formula  is NULL, then the result will be shown as Empty. (Sometimes causing error while executing crystal report). Example 1: String1 + NULL , will show empty result, the expected result is String1 Example 2: 1000 + NULL, will show empty result, the expected result is 1000,  we can