April 2018
Beginner
714 pages
18h 21m
English
book
Game Programming using Qt 5 Beginner's Guide - Second Edition
by Pavel Strakhov, Witold Wysota, Lorenz Haas
Content preview from Game Programming using Qt 5 Beginner's Guide - Second Edition
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Converting between numbers and strings
QString also provides some methods for convenient conversion between textual and numerical values. Methods such as toInt(), toDouble(), or toLongLong() make it easy to extract numerical values from strings. All such methods take an optional bool *ok parameter. If you pass a pointer to a bool variable as this parameter, the variable will be set to true or false, depending on whether the conversion was successful or not. Methods returning integers also take the second optional parameter that specifies the numerical base (for example, binary, octal, decimal, or hexadecimal) of the value:
bool ok; int v1 = QString("42").toInt(&ok, 10); // v1 = 42, ok = true long long v2 = QString("0xFFFFFF").toInt(&ok, 16); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.