Stage 0: Operators + Java Fundamentals#20
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ArchdukeTim
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ArchdukeTim
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There are already many free online courses that teach an introduction to java and its syntax. Would it be better to just recommend one of them as a precursor, rather than trying to reinvent the wheel?
| Data types refer to the type of value that our variable has. It helps tell our program more information about our variables such as what type of information it holds and how it can be used. | ||
| Data types can include numbers, characters or a string of words. Some examples of data types that are commonly used in FRC programming are: | ||
| * Int: integers or numbers that are positive or negative. Int only allows numbers without decimals. Example: 12 | ||
| * Double: Double: numbers that are positive or negative. Unlike int, double allows numbers with or without decimals. Example: 34.1 |
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| * Double: Double: numbers that are positive or negative. Unlike int, double allows numbers with or without decimals. Example: 34.1 | |
| * Double: numbers that are positive or negative. Unlike int, double allows numbers with or without decimals. Example: 34.1 |
| ## Syntax | ||
| As you start programming, you might make a mistake or make a typo. When that happens, your code will have a red line under it. This is because Java has rules called syntax. Syntax is a set of rules that have to be followed so that the computer can understand and run your code. It’s important to pay attention to the syntax! |
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Syntax errors are common, but not the only reason that you might get a compiler error. For example, using a misspelled variable name is valid syntax, but still an error.
| The name of your variable can be whatever you want. However, it should be easy to read and make sense to others who may be reading your code. | ||
| There are also some rules with variable names. The name of the variable can not include spaces. Instead you can write variables with camel case (frontLeftDrive) and snake case (front_Left_Drive). | ||
| Variable names can not start with a number. However, they can have a number at the end of the name. |
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can be whatever you want...rules with variable names
It would be better to just state what the rules and maybe conventions are
they can have a number at the end of the name
They can have a number anywhere except the start
Co-authored-by: Tim Winters <twinters007@gmail.com>
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roboteer5291
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roboteer5291
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Java fundamentals looks good.
I didn't call out the instances of this, but in line with what's standard convention and used in the rest of the course, variables used in the operators section shouldn't be capitalized.
Also, maybe we should include all references to variables names and operators in single tick code blocks? If we do this throughout the course, that may help call things out better and improve readability.
Co-authored-by: Andrew Haselton <13470989+roboteer5291@users.noreply.github.com>
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| <Aside type="note"> | ||
| When dividing two integers, the result will be an integer instead of a | ||
| double. Example: ```java System.out.print(7 / 2); ``` The example above will |
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Remove java from code block, this should be a single-tick (inline) code block too
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| ## Comparison Operators |
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Examples in this section still need to be refactored to use lowercase variable names
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| ## Logical Operators |
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Lowercase variable names here too
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| ## Logical Operators | ||
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| Logical operators are symbols that let a program make decisions by combining true or false statements. |
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| Logical operators are symbols that let a program make decisions by combining true or false statements. | |
| Logical Operators are symbols that let a program make decisions by combining true or false statements. |
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| ## Logical Operators |
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Should include a note about order of operations and parenthesis for these
| System.out.println(--y); | ||
| // [/increments] | ||
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| // [arithmetic] |
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Here and below needs refactoring to lowercase variable names
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| In the example below, we have two variables. | ||
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| ```java stage0/snippets/operators.java#increments |
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Refactor to have x++ and y++ on own lines (as discussed)
| <summary>Answer</summary> | ||
| <div class="content"> | ||
| <p> | ||
| * false. && returns true if both statements are true. `AnswerTwo` is |
| <summary>Answer</summary> | ||
| <div class="content"> | ||
| <p> | ||
| * `answer1` is 6 because 2 + 4 = 6 * `answer2` is 2 because 6 / 3 = |
| // [/multiplication] | ||
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| // [increments] | ||
| int x = 6; |
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Refactor to have x++ and y++ on own lines (as discussed)
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Added information about operators for stage 0
It includes: Arithmetic, Assignment, Comparison and Logical operators.
No exercise yet but I plan to add one in after all stage 0 material is written