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A structure is a collection of variables under a single name. These variables can be of different types, and each has a name which is used to select it from the structure. A structure is a convenient way of grouping several pieces of related information together.
Declaring Structures
struct mystruct
{
int numb;
char ch;
}
Structure has name mystruct and it contains two variables: an integer named numb and a character named ch.
Declaring structure variable
struct mystruct s1;
Accessing Member Variables
s1.numb=12;
s1.ch=’b’;
printf(“\ns1.numb=%d”,s1.numb);
printf(“\ns1.ch=%c”,s1.ch);
typedef can also be used with structures. The following creates a new type sb which is of type struct chk and can be initialised as usual:
typedef struct chk
{
char name[50];
int magazinesize;
float calibre;
} sb;
ab arnies={"adam",30,7};
Unions:
A union is an object that can hold any one of a set of named members. The members of the named set can be of any data type. Members are overlaid in storage. The storage allocated for a union is the storage required for the largest member of the union, plus any padding required for the union to end at a natural boundary of its strictest member.
union {
char n;
int age;
float weight;
} people;
people.n='g';
people.age=26;
people.weight=64;
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