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Puzzles T01 ... T10

Struct Problems

A struct is a bundle of variables that has a name. The variables of a struct are called its members. For example, the following struct has the name bulb and contains two members, watts and lumens. Think of the struct as representing a light bulb that has particular values for watts and lumens.

struct
{
  int watts;
  int lumens;
} bulb;

The declaration allocates memory for the struct and provides for a way to access its members using dot notation: bulb.watts and bulb.lumens. The syntax of struct declaration is this:

struct tag { member-list } variable-list;

The tag is the name of the type of struct being declared. The tag is optional if there is a variable-list. The member-list is a list of members contained this struct. The members may be of different types (although in this example they are both int.

The variable-list is a list of identifiers. Each identifier is the name of a variable of this type of struct. The variable-list is optional if there is a tag. Here is a declaration of three variables:

struct
{
  int watts;
  int lumens;
} bulb20, bulb60, bulb100;

Here is a declaration of a struct with a tag, but no variables. This declares a way to lay out memory, but no variables have been declared, yet.

struct BulbType
{
  int watts;
  int lumens;
};

Following the above, struct variables may be declared by using the struct's tag:

struct BulbType bulb20, bulb60, bulb100;