Retrieving 64-bit Integer Values

The ValueInt64() method provides a direct, type-safe way to retrieve the value of a uCalc variable defined as a 64-bit integer (Int64 or Int64u).

Core Usage

This method is the counterpart to the ValueInt64 setter. It is used to access the current value of a variable from the host application, typically after it has been manipulated by a uCalc expression or set programmatically.

### 🆚 Comparative Analysis: Why Use a Type-Specific Getter?While uCalc offers several ways to retrieve a variable's value, `ValueInt64()` is the best choice for 64-bit integers due to performance and data integrity.1.  **`ValueInt64()` (Type-Safe Getter - Recommended)**    *   **Pros**: Fastest method, returns the exact binary value without conversion, and preserves the full precision of 64-bit integers.    *   **Cons**: Specific to one data type.    *   **Best for**: Performance-critical code and handling large numbers like timestamps, database IDs, or financial calculations.2.  **`Value()` (Generic Getter - Potential Precision Loss)**    *   This method always returns a `double`. While convenient, a `double` only has about 15-17 decimal digits of precision. A 64-bit integer can have up to 19 digits. Using `Value()` on large `Int64` values **will result in precision loss**.    *   **Best for**: General-purpose numeric retrieval where maximum precision is not critical.3.  **`ValueStr()` (String-Based Getter)**    *   This method returns the value as a string. It preserves precision but is slower due to the overhead of converting the number to a string and subsequent parsing if you need to use it as a number in your host application.    *   **Best for**: Displaying values or when a string representation is the desired final format.In summary, always use `ValueInt64()` to retrieve `Int64` or `Int64u` variables to guarantee both speed and data integrity.