Delphi 2 Developer's Guide by Xavier Pacheco PDF

By Xavier Pacheco

ISBN-10: 0672309149

ISBN-13: 9780672309144

Meant to capitalize at the developments in the direction of GUI-based software improvement utilizing visible programming instruments, object-oriention and the necessity for info expertise to unravel company difficulties, this booklet isn't really for the beginner. quite, it's for knowledgeable clients of Delphi or Pascal and people members looking an commercial energy instrument.

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Continue and break Before we leave this discussion of loops, you need to know about two keywords that help control program execution in a loop. The continue statement is used to force program execution back to the top of the loop. For example, you might have part of a loop that you don’t want to execute if a particular test returns true. done) { // some code bool error = SomeFunction(); if (error) continue; // jumps to the top of the loop // other code that will execute only if no error occured } The break statement is used to halt execution of a loop prior to the loop’s normal test condition being met.

Which one is being used? The one within the while loop, because it has the most immediate scope. NOTE A recent C++ draft rule change affects the visibility of a variable that is declared inside a statement like a for statement. (The C++ draft is a document that the C++ standards committee issues. 97 CH02 LP#3 Wading In Deeper 55 This code generates a compiler error because the variable i is visible only inside the for loop code block. In order to get this code to compile, you would have to declare i outside the for statement: int i; for (i=0;i<10;i++) { if (array[i] == 40) break; } index = i; Although this change won’t affect you if you are just learning C++, it threw many old C++ programmers for a loop when it was first announced.

Knowing the shortcuts also helps you understand C++ code that you read in examples and sample listings. In some cases you want to perform an action if the conditional expression evaluates to true and perform some other action if the conditional expression evaluates to false. In this case you can implement the else statement: if (x == 20) { DoSomething(x); } else { DoADifferentThing(x); } NEW TERM The else statement is used in conjunction with the if statement and identifies sections of code that are executed when the if statement fails (that is, evaluates to false).

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Delphi 2 Developer's Guide by Xavier Pacheco


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