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This function returns an instance of IloNumExprArg, the
 internal building block of an expression, representing the scalar product of
 the variables in the arrays vars and values
 or the arrays leftExprs and rightExprs.
This function returns an integer value representing the scalar product of
 integer values in the arrays vals1 and vals2.
This function returns a numeric value representing the scalar product of
 numeric values in the arrays vals1 and vals2.
This function returns an instance of IloIntExprArg, the internal building block of an
 integer expression, representing the scalar product of
 the variables in the arrays vars and values
 or the arrays leftExprs and rightExprs.