Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example:  "To set the password to the connection parameter, the code fragment,  db_conn.setPassword(""), is issued."

A block of code is set as follows:

QSqlDatabase db_conn =
        QSqlDatabase::addDatabase("QMYSQL", "contact_db");

db_conn.setHostName("127.0.0.1");
db_conn.setDatabaseName("contact_db");
db_conn.setUserName("root");
db_conn.setPassword("");
db_conn.setPort(3306);

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

[default]
exten => s,1,Dial(Zap/1|30)
exten => s,2,Voicemail(u100)
exten => s,102,Voicemail(b100)
exten => i,1,Voicemail(s0)

Any command-line input or output is written as follows:

% mkdir helloWorld
% ./run_executable

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "It displays the text Hello world ! in a label."