Download Delphi 2 Developer's Guide by Xavier Pacheco PDF

By Xavier Pacheco

Meant to capitalize at the developments in the direction of GUI-based program improvement utilizing visible programming instruments, object-oriention and the necessity for info know-how to resolve company difficulties, this ebook isn't for the amateur. relatively, it truly is for skilled clients of Delphi or Pascal and people members looking an business power software.

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If the user enters a number greater than 10, the expression x > 10 evaluates to true and the message is displayed; otherwise nothing is displayed. Note that if the conditional expression evaluates to true, the statement immediately following the if expression is executed. NEW TERM NOTE The if statement is used to test for a condition and then execute sections of code based on whether that condition is true or false. Be sure not to follow the if expression with a semicolon. A semicolon by itself represents a blank statement in code.

Here’s an example: if (x > 10) if (x < 20) cout << “X is between 10 and 20” << endl; Keep in mind that these are simplified examples. In the real world you can get lost in the maze of braces that separate one function block from the next. Take a look at this code snippet, for instance: if (x > 100) { y = 20; if (x > 200) { y = 40; if (x > 400) { y = 60; DoSomething(y); } } } else if (x < -100) { y = -20; if (x < -200) { y = -40; if (x < -400) { y = -60; DoSomething(y); } } } Even this is a fairly simple example, but you get the idea.

It would be convenient to be able to have a single data variable that could be used to hold all the fields needed in a typical mailing list. A structure will allow you to do that. You first declare a structure and then later create an instance of that structure when you want to put the structure to use. A structure is declared with the struct keyword: struct mailingListRecord { char firstName[20]; char lastName[20]; char address[50]; char city[20]; char state[4]; int zip; bool aFriend; bool aFoe; }; Each of the elements of a structure is called a data member.

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