Chapter 2: Contact Management in C | File Handling

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If you remember we have categoried all the functions into two types user functions and operational functions. Here I will explain the operational function and its usage in user functions one by one.

First, let's define Variables and Data Structure.

// Define Constant Variables
#define ESC 27
#define MAX_NAME_SZ 15
#define MAX_NUM_SZ 25
#define READ_ARRAY_SZ 15
#define DATA_FILE "dataFile.dat"
#define TEMP_FILE "tempFile.dat"

//Define data structure

struct data{
    char fName[MAX_NAME_SZ];
    char lName[MAX_NAME_SZ];
    char mPhone[MAX_NUM_SZ];
    char wPhone[MAX_NUM_SZ];
    char hPhone[MAX_NUM_SZ];
};

We will use struct data types to store contact information. It has only five fields First Name (fName), Last Name (lName), Mobile Phone (mPhone), Work Phone (wPhone), Home Phone (hPhone), and all these variables are char types. We can't set primary key as in database but we will choose Mobile Phone i.e mPhone as a primary key and will make sure that Mobile Phone number will not be a null value or duplicate while adding data into the file.

Chapter 1: Contact Management in C | Flow Chart and Functions

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Application Flow Chart:

Functions: 

We will divide the above application into two kinds of functions. The first type of function is user functions which interact with the user to get input and display output, the second type of function is operational functions which do the actual tasks. 

The list of user functions is as follows:

• mainMenu(): It displays the options to the user. 
• viewItems(): It displays the list of contact information on the screen. 
• addItems(): It requests the user to input contact information added to the file.
• updateItems(): It requests the user to update the contact information in the file.
• deleteItems(): It requests the user to delete the contact information in the file.
• readData(): It requests the user to input contact information.

Quiz Game in C Part 3: Final Game Play and score

In previous articles, we created functions, multi-dimensional character array to store questions, options, and answers. Up to this point, we have everything ready to finish gameplay.
Here we will use the following techniques:

• Create for loop to display question one by one
• Create another infinite loop inside for loop to check the answer given by the user. The loop breaks only if the user-provided an answer is within options (a, b, c and d)  otherwise it will loop infinitely. 
• Calculate the score for the correct answer provided.
• Use gotoxy to manage text indentation.

Quiz game in C Part 2: Multi-dimensional C array

In this article, we will discuss the gameplay() function but not all only the usages of one dimension, two-dimension, and third dimension character array. Choosing the correct dimension of the array is very important to store information effectively. We have to display a question, four options and store the correct answer to compare the answer provided by the user. Remember these three information are connected to each other if we mismatch the order then the game will go wrong. 
Here, we will declare three character array to store questions, four options, and answer in the same order of the array index.

Question is a string which is an array of character and we will ask 10 questions in total. We create a two-dimension character array, the first index is a total number of questions i.e 10 and the second index is the length of a string.

    char question[10][250];
    strcpy(question[0], "This is question no 1");
    strcpy(question[1], "This is question no 2");
    strcpy(question[2], "This is question no 3");
    strcpy(question[3], "This is question no 4");
    strcpy(question[4], "This is question no 5");
    strcpy(question[5], "This is question no 6");
    strcpy(question[6], "This is question no 7");
    strcpy(question[7], "This is question no 8");
    strcpy(question[8], "This is question no 9");
    strcpy(question[9], "This is question no 10");

We can't assign string using "=" to the two-dimension array and correct way to use it is strcpy() function.

Quiz Game in C part 1 - Flow Chart and Main Menu

Application Flow Chart:

Start: Quiz program start

Main Menu: Program display menu to the user to start the game or to quit.

User Input: The application stops to get user input.

Decision Tree: If user input is S then Quiz game start else if user input is Q then the program will quit.

Quiz Game: User gets 10 questions one by one and each correct score is marked as 1.

Display Score: It display final score after ending the game and the user is directed to the main menu.

Stop: End of the game.

Basic GLFW Tutorials with C++

GLFW (OpenGL FrameWork) is open source library to create OpenGL Window and multi-platform  too. Very easy to manage OpenGL context and event with GLFW. It is specially suitable for game development. GLFW doesn't render 3D scene for that you have to use OpenGL library function. GLFW help to create window , handle keyboard , mouse and joystick events. This tutorials is for those who are new to OpenGL and GLFW. By the end of this tutoirals series understand the basic knowledge about OpenGL and handling events with GLFW.

Tutorials 1: Setup GLFW in Code::Blocks IDE in Windows Machine

Tutorials 2:  Introduction to GLFW

Tutorials 3: Drawing Basic Shapes

Tutorials 4: Transformation: Translation, Rotation and Scalling

Tutorials 5: Texture Mapping 

Modern OpenGL Tutorial Series

Modern OpenGL are different than ancient opengl version before 2.0. After opengl 2.0 vetex shader and fragment shader became compulsory. It is little bit difficult for beginner to start.

All chapter include basic concept of Modern OpenGL and especially focus on beginner. After going through all the chapter user can get concept of shader, drawing shapes, perspective projection, transformation, color, texture mapping and load 3D model wavefront OBJ.

Download all the code as a zip from here: https://github.com/smokindinesh/Modern-OpenGL-Series/archive/master.zip

All the code in this series of articles is available from github: https://github.com/smokindinesh/Modern-OpenGL-Series You can download a zip of all the files from that page, or you can clone the repository if you are familiar with git.