| Chapter 15: Tables |

| 15.7. Blank entries

We are allowed to leave certain entries blank (perhaps to be filled in later, perhaps not) by writing "--" instead of the relevant value:

> Table 2.1 - Selected Elements

> Element | Symbol | Atomic number | Atomic weight
> "Hydrogen" | "H" | 1 | 1
> "Iron" | "Fe" | -- | 56
> "Zinc" | -- | 30 | 65
> "Uranium" | "U" | 92 | 238

Should we do this, then the condition

> if there is a symbol corresponding to an atomic number of 30 in the Table of Standard Elements ...

will be false, and any attempt to get the value there will result in an error when the game is in play. Similarly, this will also prove false:

> if there is an atomic number in row 2 of the Table of Standard Elements ...

Previous | Contents | Next