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ch04-getting-stuff-done-i
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ch04-getting-stuff-done-i [2017/08/30 22:57] mithat |
ch04-getting-stuff-done-i [2017/09/27 23:26] (current) mithat |
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| Some modern languages, like Python 3, define //all// division as floating-point division by default. If you want to perform truncating division, you have to explicitly ask for it. JavaScript takes this one step further: it doesn't differentiate between floating-point and integer types at all; that is, in JavaScript there is only one numeric type. | Some modern languages, like Python 3, define //all// division as floating-point division by default. If you want to perform truncating division, you have to explicitly ask for it. JavaScript takes this one step further: it doesn't differentiate between floating-point and integer types at all; that is, in JavaScript there is only one numeric type. | ||
| - | The potential performance advantage of integer math is particularly important in real-time processes---including animations. Therefore, it's a good idea in Processing to be in the habit of not using floating-point variables and operations unless you have a good reason for it. | + | The potential performance advantage of integer math is particularly important in real-time processes---including animations. Therefore, it's a good idea in Processing to be in the habit of not using floating-point variables and operations unless you have a good reason to do so. |
| </WRAP> | </WRAP> | ||
| === Modulus === | === Modulus === | ||
| - | TODO | + | The ''%%%%%'' operator is used for the modulus operator. The modulus operator operates on two operands that must be (or evaluate to) integer (not just numeric) values. Despite appearances, this operation has nothing to do with percentages. The operation produces the //remainder// that results from the division of the two operands. |
| + | |||
| + | <code> | ||
| + | int x = 5; | ||
| + | int y = 3; | ||
| + | int z; | ||
| + | |||
| + | z = x % y; | ||
| + | </code> | ||
| + | |||
| + | The result of the above is that ''%%z%%'' holds the value 2. ((To be pedantic, there is a difference between modulus and remainder, but it only applies to negative numbers. FIXME)) | ||
| === Assignment === | === Assignment === | ||
| Line 148: | Line 158: | ||
| ==== Mixing numeric types ==== | ==== Mixing numeric types ==== | ||
| + | FIXME TODO | ||
| ==== Logical operators ==== | ==== Logical operators ==== | ||
| - | TODO | + | FIXME TODO |
| ==== The number of operands ==== | ==== The number of operands ==== | ||
| Line 163: | Line 174: | ||
| Theoretically, it's possible for a language to define an operator with an arbitrary number of operands, but I am not aware of any operators that take more than three operands in Processing. | Theoretically, it's possible for a language to define an operator with an arbitrary number of operands, but I am not aware of any operators that take more than three operands in Processing. | ||
| + | |||
| + | ---------------------------------- | ||
| ===== Expressions ===== | ===== Expressions ===== | ||
| Line 168: | Line 181: | ||
| Expressions are made of up one or more operations and return a value. | Expressions are made of up one or more operations and return a value. | ||
| - | TODO | + | FIXME TODO |
| ==== Order of precedence ==== | ==== Order of precedence ==== | ||
| - | TODO | + | FIXME TODO |
| ==== Whitespace ==== | ==== Whitespace ==== | ||
| - | TODO | + | FIXME TODO |
| (Spaces, tabs, and the invisible characters that mark the end of a line. In short, whitespace in Processing (and Java, C++, and C) is interchangeable. In other words, from Processing’s point of view, a space is the same thing as a tab is the same thing as the end of a line.) | (Spaces, tabs, and the invisible characters that mark the end of a line. In short, whitespace in Processing (and Java, C++, and C) is interchangeable. In other words, from Processing’s point of view, a space is the same thing as a tab is the same thing as the end of a line.) | ||
ch04-getting-stuff-done-i.1504133864.txt.gz · Last modified: 2017/08/30 22:57 by mithat
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