C-and-C++/C4/Working-With-Structures/English

Title of script: Structures

Author: Ashwini Patil

Keywords: Strucutre, structure variable, Video tutorial.

Visual Cue	Narration
Slide 1	Welcome to the spoken-tutorial on Structures in C and C++.
Slide 2 Learning Objectives	In this tutorial we will learn what, Is a Structure. Declaration of a structure We will do this through an example
Slide 3 System requirements	To record this tutorial, I am using, Ubuntu Operating System version 11.04, gcc and g++ Compiler version 4.6.1
Slide 4 Introduction	Let us start with the introduction to Structure When one or more variables are grouped under one name it is known as structure. Strucutre is used to group different data into one object. It is called as compound data-type. It is used to group related information together.
Slide 5	Now we will see The syntax to declare a structure Here the keyword struct tells the compiler that a structure is declared strcut_name is the name of the structure. eg. struct employee; You can give any name.
Slide 6	Now we will see how to declare a structure variable. The Syntax for this is struct struct_name and struct_var; struct_var is the variable of type struc_name eg. struct employee addr; addr is the variable of type employee.
	Let us move on to our example
	I have already typed the program on the editor So let me open it.
Point to struct.c	Note that our filename is structure.c
	In this program we will calculate the total marks of three subjects using structure
	Let me explain the code now.
Highlight #include <stdio.h>	This is our header file.
Highlight struct student	Here we have declared a structure as student.
Highlight int eng; int maths; int science;	Then we have declared three integer variables as english, maths and science. Variables defined under the structure are called as members of the structure.
Highlight int main()	This is our main function
Highlight int total	Here we have declared an integer variable total.
Highlight struct student st;	Now we have declared a structure variable stud, stud is the variable of type student,it is used to access and modify the structure members
Highlight st.eng = 75; st.maths = 70; st.science = 65;	Here we have modified the members By assigning them values of 75, 70 and 65.
Highlight total = st.eng + st.maths + st.science;	Here we calculate the total of the three subjects.
Highlight printf("Total is %d\n",total);	Then we print the result.
Highlight return 0;	This is our return statement.
Click on Save	Now click on Save
	Let us execute the program
Press Ctrl, Alt and T keys	Please open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
Type gcc struct.c -o struc Type ./struc	To compile Type gcc space structure.c space -o space struct And press Enter To execute Type ./struct Press Enter
Highlight Output	The output is displayed as: Total is 210
In C++	Now we will execute the same program in C++
On the editor	Come back to our program.
	I will edit the same code
Click on Save as option Type .cpp	First press shift, cntrl and S keys simultaneously on the keyboard Now save the file with an extension .cpp and click on save
Type iostream	Let us change the header file as iostream
Type using namespace std;	Now include the using statement and click on save
	Structure declaration in C++ is same as in C So no need to change anything here
Type cout <<	At the end we will replace the printf statement with the cout << statement.
Delete \n and , Type << << “\n”	Delete the format specifier and \n Now delete the comma Type two opening angle brackets. Here delete the closing bracket and type two opening angle backets And within the double quotes type \n
Click on Save	Now click on Save
	Let us execute the program
On the terminal Type g++ struc.cpp -o st2 Type ./st2	Come back to our terminal To compile type g++ space structure.cpp space -o space struct1 Here we have struct1 because we dont want to overwrite the output parameters for the file structure.c Now press Enter To execute type ./struct1 Press Enter
Highlight Output	The output is displayed as: Total is 210 You can see that the output is same as our C code Now come back to our slides.
Slide 7 Summary	We will summarize now. In this tutorial we learned, Structure. Syntax of a structure. eg. struct struct_name; To access members of a structure. Eg: stud.maths = 75; To add the structure variables. Eg: total = stud.eng + stud.maths + stud.science;
Slide 8 Assignment	As an assignment, Write a program to diplay the records of an employee. Like name, address, designation and salary.
Slide 9 http://spoken-tutorial.org /What\_is\_a\_Spoken\_Tutorial About the Spoken Tutorial Project	Watch the video available at the link shown below It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it
Slide 10 Spoken Tutorial Workshops	The Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates to those who pass an online test For more details, please write to contact@spoken-tutorial.org
Slide 11 Acknowledgement	Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at the link shown below: http://spoken-tutorial.org\NMEICT-Intro
	Ashwini Patil from IIT Bombay Thank You for joining

Contributors and Content Editors

Ashwini