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The boolean data type is a VT_BOOL parameter that takes on the value of VARIANT_TRUE (–1) or VARIANT_FALSE (0). The following table lists the difference between the programmatic representations of logical TRUE in C/C++ and the Automation type.
| Language | Value | Numerical value |
|---|---|---|
| C/C++ | TRUE | 1 |
| Automation | VARIANT_TRUE | –1 |
Both types are nonzero and therefore not FALSE, but have different representations for TRUE.