C++ How to Program, 10/e

... 10005206 6 9996802 

As the output shows, we can simulate rolling a six-sided die by scaling and shifting the values rand produces. The default case (lines 41–42) in the switch should never execute, because the switch’s controlling expression (face) always has values in the range 1–6. We provide the default case as a matter of good practice. After we study arrays in Chapter 7, we show how to replace the entire switch in Fig. 6.7 elegantly with a single-line statement. This will be another of those “light-bulb” moments.

Error-Prevention Tip 6.4

Provide a default case in a switch to catch errors even if you are absolutely, positively certain that ...