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Application Development with Qt Creator - Second Edition

Application Development with Qt Creator - Second Edition

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Application Development with Qt Creator - Second Edition

Application Development with Qt Creator - Second Edition

4 (25)

Overview of this book

This book is great for developers who are new to Qt and Qt Creator and who are interested in harnessing the power of Qt for cross-platform development. If you have basic experience programming in C++, you have what it takes to create engaging cross-platform applications using Qt and Qt Creator!
Table of Contents (15 chapters)
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14
Index

Getting started – our sample library

This chapter's example code has two pieces: a library that defines a public function and a console application that calls this function. Libraries are a great way to break up your applications, and while this example is simple, it also lets me show you how to create a library and include it in your application.

I'm going to stretch your imagination a bit; let's pretend that you're responsible for setting up a library of math functions. In this example, we'll only write one function, factorial. You should be able to recollect the factorial function from introductory programming; it's represented by a ! and is defined as follows:

  • 0! is 0
  • 1! is 1
  • n! is n × (n - 1)!

This is a recursive definition and we can code it in the following way:

unsigned long factorial(unsigned int n)
{
    switch(n) 
    {
        case 0: return 0;
        case 1: return 1;
        default: return n * factorial(n-1);
    }
}

An alternate definition...

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