Structures in Cs

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Structures In C

• A structure is a collection of one or more variables, possibly of different data types, grouped together under a single name for convenient handling.

• Structure declaration• Nested structures• Arrays of structures• Pointers to structures• Structures and functions

Structure declaration• A structure type is usually defined near to the start of a file

using a typedef statement.

• typedef struct• { • char name[64]; • char course[128]; • int age; • int year; • } student;

Nested structures • Structures can contain other structures as

members; in other words, structures can nest. Consider the following two structure types:

• struct first_structure_type { • int integer_member; • float float_member; • }; • struct second_structure_type { • double double_member; • struct first_structure_type struct_member; };

Arrays of structures

• Just as arrays of basic types such as integers and floats are allowed in C, so are arrays of structures. An array of structures is declared in the usual way:

• struct personal_data my_struct_array[100];

Pointers to structures

• A pointer to a structure types variable is declared by a statement such as the following:

• struct personal_data *my_struct_ptr;

Example of structuer•

#include<stdio.h>

struct person{ char *name;int age;

• };

int main(){ struct person p;p.name = "John Smith";p.age = 25;printf("%s",p.name);printf("%d",p.age);return 0;

• }

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