multi-parameter constructor can still be a converting constructor, if all but the first parameter have default values. The explicit keyword can be applied to a constructor or (since C++11) a conversion operator, to are either input to the function, output from the function, or both. Input parameters are usually values or const references, while output and input/output parameters will be non-const pointers. When ordering string *out); 23 In fact it is a very strong convention in Google code that input arguments are values or const references while output arguments are pointers. Input parame- ters may be const pointers

Default Iterators and Operators Generators Lambda Functions Conditional Expressions Default Argument Values Properties True/False evaluations Deprecated Language Features Lexical Scoping Function and Method using all caps with underscores; see Naming below. • It is sometimes useful for globals to cache values needed or returned by functions. • If needed, globals should be made internal to the module and accessed preserved for each call. A generator uses less memory than a function that creates an entire list of values at once. Cons: None. Decision: Fine. Use “Yields:” rather than “Returns:” in the doc string for

Definitions and Calls Function definitions should first list arguments without default values, followed by those with default values. In both function definitions and function calls, multiple arguments per line calculated. # y: The other vector. x and y must have the same length, greater than one, # with no missing values. # verbose: If TRUE, prints sample covariance; if not, not. Default is TRUE. # # Returns: # The sample 6 if (TRUE %in% is.na(x) || TRUE %in% is.na(y)) { stop(" Arguments x and y must not have missing values.") } covariance <- var(x, y) if (verbose) cat("Covariance = ", round(covariance, 4), ".\n", sep =

2021/22 Presentation – Figures, cont.  Fair Ranges of Parameters  Evaluate common ranges of values  Don’t hide important information Experiments and Result Presentation Don’t limit range to make