Simple .NET/ASP.NET PDF document editor web control SDK

Most options can usually be left as the default, but the -prefix option is good to use You can direct the installation to go to a specific location by specifying a path just after the option For instance, to install Qt in a directory called inst/qt4 in your home directory, use the following configure command: /configure prefix ~/inst/qt4 The Mac OS X platform has two other options that are important to note First, adding the -universal option creates universal binaries using Qt If you plan to use a PowerPC-based computer for your development, you have to add the -sdk option The configure script also makes you accept the open source license (unless you have a commercial license) before checking that all the dependencies are in place and starting to create configuration files in the source tree.

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< > <= >= == !=

Meaning Less than Greater than Less than or equal to Greater than or equal to Equal to Not equal to

Just as you can combine numeric expressions into more complex and powerful expressions, C# provides operators that let you combine Boolean expressions to test multiple conditions. The && operator combines two Boolean expressions into a single expression that s true only if both conditions are true. In our race example, we might use this to hide the low-fuel warning if we re near the end of the race and the car has enough fuel to make it to the finish line. Imagine that we added an extra argument to pass in the number of remaining laps in the race, and an additional variable to hold that value; we could write:

if ((predictedLapsUntilOutOfFuel < 4) && (predictedLapsUntilOutOfFuel < remainingLapsInRace)) { Console.WriteLine("Low on fuel. Laps remaining: " + predictedLapsUntilOutOfFuel); }

When the script is done, you can build Qt using the following command: make This process will take a relatively long time to complete, but after it finishes you can install Qt by using the next line: make install.

This has the same effect as the following slightly more verbose code:

JavaScript Object Notation (JSON)

if (predictedLapsUntilOutOfFuel < 4) { if (predictedLapsUntilOutOfFuel < remainingLapsInRace) { Console.WriteLine("Low on fuel. Laps remaining: " + predictedLapsUntilOutOfFuel); } }

Only if both conditions are true will the message be displayed. There s also a || operator. Like &&, the || operator combines two Boolean expressions, but will be true if either of them is true.

Listing 1-13. Populating a QList and printing the contents QList<QString> list; list << "foo" << "bar" << "baz";

The if statement examples we ve looked at so far just decide whether to execute some optional code, but what if we want to choose between two actions An if statement can optionally include an else section that runs if the condition was false, as in this hypothetical post-race example:

if (weWonTheRace) { Sponsors.DemandMoreMoney(); } else { Driver.ReducePay(); }

One type of if/else test comes up often enough that C-family languages have a special syntax for it: sometimes you want to pick between one of two values, based on some test. You could write this:

foreach( QString s, list ) qDebug() << s; Listing 1-13 shows how Qt developers think lists ought to be: easy to use. Using the foreach macro shortens the code, but iterator instances are used behind the scenes. Qt offers both STL-style iterators and Java-style iterators. The code in Listing 1-14 shows how both iterators are used. The while loop at the top of the list uses the Java-style iterator QListIterator. The function hasNext checks to see whether there are any more valid items in the list, whereas the next method returns the current item and moves the iterator to the next item. If you want to look at the next item without moving the iterator, use the peekNext method. The for loop at the end of the listing uses STL-style iterators. The iterator name can be specified using either STL naming or Qt naming const_iterator and ConstIterator are synonyms, but the latter is more Qt-ified. When iterating in for loops, it is valuable to use ++iterator instead of iterator++. This gives you more efficient code because the compiler avoids having to create a temporary object for the context of the for loop. Listing 1-14. STL-style iterators and Java-style iterators side by side QList<int> list; list << 23 << 27 << 52 << 52; QListIterator<int> javaIter( list ); while( javaIter.hasNext() ) qDebug() << javaIter.next(); QList<int>::const_iterator stlIter; for( stlIter = list.begin(); stlIter != list.end(); ++stlIter ) qDebug() << (*stlIter); When comparing STL- and Java-style iterators, it is important to remember that STL-style iterators are slightly more efficient. However, the readability and code clarity provided by the Java-style iterators might be enough motivation to use them.

string messageForDriver; if (weWonTheRace) { messageForDriver = "Congratulations"; } else { messageForDriver = "You're fired"; }

Sometimes it s more convenient to be able to put this inside an expression. This can be done with the ternary operator, so called because it contains three expressions: a Boolean test expression, the expression to use if the test is true, and the expression to use if the test is false. The syntax uses and : characters to separate the expressions, so the basic pattern is test resultIfTrue : resultIfFalse. We can collapse the previous if...else example to a single assignment statement by using the ternary operator in the expression on the righthand side of the assignment: