C API Reference# AMPL functions# All functions provided by the AMPL C API have prefix AMPL_. AMPL AMPL_DATAFRAME AMPL_ENVIRONMENT AMPL_ERRORHANDLER AMPL_OUTPUTHANDLER AMPL_RunnablePtr AMPL_TUPLE AMPL_VARIANT AMPL_TYPE Algebraic entities functions# AMPL_ENTITY AMPL_INSTANCE AMPL_CONSTRAINT AMPL_CONSTRAINTINSTANCE AMPL_OBJECTIVE AMPL_PARAMETER AMPL_SET AMPL_SETINSTANCE AMPL_VARIABLE AMPL_VARIABLEINSTANCE