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Add new range constraints to a model. A range constraint states that the value of the input expression must be between the specified lower and upper bounds in any solution.

 GRBConstr* addRanges ( const GRBLinExpr* exprs, const double* lower, const double* upper, const string* names, int count )
Arguments:

exprs: Linear expressions for the new range constraints.

lower: Lower bounds for linear expressions.

upper: Upper bounds for linear expressions.

name: Names for new range constraints.

count: Number of range constraints to add.

Return value:

Array of new constraint objects. Note that the result is heap-allocated, and must be returned to the heap by the user.