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# Numeric Codes

Gurobi makes use of numeric codes to keep API usage consistent across different supported programming languages. This section provides a reference for:

- Optimization Status Codes, which report the solving state of a model;

- Batch Status Codes which report the status of a batch solve;

- Callback Codes, which provide a way to query the state of an in-progress solve; and

- Error Codes, which define the failure mode of a Gurobi API call; and

- Nonlinear Operation Codes, which define the operators applied in nonlinear expression tree nodes.

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