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Lab9 Mech

Lab 9 focuses on the differences between structures and unions in C programming. It covers the definition, declaration, and examples of structures and unions, emphasizing their usage for combining different data types and efficient memory management. Several exercises are provided to practice creating and manipulating structures related to employee and student details.

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29 views18 pages

Lab9 Mech

Lab 9 focuses on the differences between structures and unions in C programming. It covers the definition, declaration, and examples of structures and unions, emphasizing their usage for combining different data types and efficient memory management. Several exercises are provided to practice creating and manipulating structures related to employee and student details.

Uploaded by

ahmedhamada.hs123
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Lab 9

Computer Programming
ECO 123

1/4/2022 1
Lab 9
Lab objectives
1. Difference between structures & unions
2. Structures declaration
3. Structures examples • Structures

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structures in C

A structure is a user-defined data type available


in C that allows to combining data items of
different kinds. Structures are used to represent a
record.

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Defining a structure: To define a structure, you must use the
struct statement. The struct statement defines a new data type,
with more than or equal to one member. The format of the struct
statement is as follows:

struct [structure name]


{
member definition;
member definition;
...
member definition;
};
1/4/2022 4
Union

A union is a special data type available in C that allows


storing different data types in the same memory
location. You can define a union with many members,
but only one member can contain a value at any given
time. Unions provide an efficient way of using the
same memory location for multiple purposes.

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Defining a Union: To define a union, you must use the union
statement in the same way as you did while defining a
structure. The union statement defines a new data type with
more than one member for your program. The format of the
union statement is as follows:

union [union name]


{
member definition;
member definition;
...
member definition;
};
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Ex1: C program to create, declare and initialize structure

In this program, we will learn how to declare a structure


with different types of variables, declare and
initialization of structure variable? Here we are not
reading values from keyboard; we are assigning the
values to the structure members at the time of structure
variable declaration.
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Ex2: Write C program to accept the details of
employee and display them using structure.
Details consist of Employee ID, Name,
Designation, Department, Salary.

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Ex3: C program to read information of
student. It contains Name, Roll number,
Birthday, admission date. Calculate age of
student at the time of admission.

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Ex4: Write a 'C' Program to create a structure
of student having fields roll_no, stud_name,
mark1, mark2, mark3. Calculate total marks
and average marks. Arrange the records in
descending order of marks.

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