Hello Processing - Vula

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An Introduction To Programming With Processing There are two points worth noting here, firstly we have input data into the println() function and secondly it has returned data back to us, that being what it has printed to the debugger console. When a function is used in this way we are said to be calling a function. Functions are the building blocks of Processing and we will be using them regularly and even creating our own. The process of calling a function visualized. Syntax and syntax errors The arrangement of components within a statement is exceptionally important in programming. Unlike in natural languages, where sentences can be structured in several different configurations and still have the same meaning. In programming a specific syntax exists for all languages and must be adhered to or your compiler/ interpreter might throw an exception or a syntax error. Syntax errors are generally quite common when you first start programming, it is easy to forget to place a semi-colon at the end of a statement or close parenthesis that have been left hanging open. Errors like these are often easy to debug, particularly when using the PDE. For example if we were to make a mistake in our Hello World 1.0 program and forget to close the open parenthesis, when trying to run the sketch we could get an error looking something like this... Hello World Program 1.0 48
An Introduction To Programming With Processing Syntax errors are common when one first starts programming, but with the help of the debugging console they can be relatively easy to identify. As you can see debugging the program in this case is really quite simple, in fact the PDE tells us exactly where the error is. In larger programs however it might not be so obvious where the problem lies, although the PDE will try to help you in tracking down a bug where ever it can. Some pointers to remember when constructing statements in Processing • Always end statements with a semi-colon • All parenthesis (), brackets [] and braces {} that are opened with their corresponding left characters must be closed with the right version of the same character. None of these sets are interchangeable, but some of these sets are nestable. • A String of literal characters (such as “hello world”) must exist between double quotes. Single quotes are reserved for the char data type (discussed later). • If you have any uncertainties about your program, such as how to use a function or it's syntax, look it up in the Processing reference which can be accessed online at http://processing.org/reference/ or from the PDE ,for offline viewing, click : Help → Reference Of course there are many other points worth noting on syntax and program structure but we will get to these in due time, for now there's no need to get ahead of ourselves. Hello World Program 1.0 49
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Hello Processing - Vula

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