| Input Parameters | Significance |
| char *str | real-number string to be checked |
| char sig | kind of decimal delimiter (point or comma) |
| Output Parameters | Significance |
| none | - |
| Return Code | Significance |
| 0 | no error |
| 1 | wrong decimal delimiter |
| 2 | no real-number string |
DataView calls tis function by default when leaving a field of the float or money type.
If the string to be checked does not conform with the real format, DataView will issue a standard error message.