Difference between revisions of "C"
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=General Skills= | =General Skills= | ||
| + | ==Helloworld== | ||
| + | |||
==Constants - Variables - Data Types== | ==Constants - Variables - Data Types== | ||
| + | There are 9 types of data types. These include: | ||
| + | *boolean | ||
| + | *string | ||
| + | *integer | ||
| + | *double | ||
| + | *decimal | ||
| + | *character | ||
| + | *byte | ||
| + | *float | ||
| + | *long | ||
| + | |||
| + | To declare a variable you state the data type followed by the name of the variable: | ||
| + | |||
| + | DataType VariableName; | ||
| + | |||
| + | You can declare and assign a variable at the same time: | ||
| + | |||
| + | DataType VariableName = Value; | ||
| + | |||
| + | ===Examples=== | ||
| + | |||
| + | '''Boolean''' is a binary value, being either true or false. | ||
| + | |||
| + | <syntaxhighlight lang="csharp">bool example = true;</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''String''' is used for storing characters in word form. | ||
| + | |||
| + | <syntaxhighlight lang="csharp">string example = "hello world";</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Integer''' is used to store whole numbers (32 bit values). | ||
| + | |||
| + | <syntaxhighlight lang="csharp">int example = 457568368;</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Double''' is used to store numbers where there are numbers before and after the decimal point, using 64 bits of memory. | ||
| + | |||
| + | <syntaxhighlight lang="csharp">double example = 3.3;</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Decimal''' is used to store larger numbers with information before and after the decimal point, using 128 bits of memory. | ||
| + | |||
| + | <syntaxhighlight lang="csharp">decimal example = 12.593;</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Character''' is used to store single letters. | ||
| + | |||
| + | <syntaxhighlight lang="csharp">char example = 'A';</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Byte''' is used to store a byte (eight bits). In C#, it is specifically an 8 bit integer (0-255). | ||
| + | |||
| + | <syntaxhighlight lang="csharp">byte example = 255;</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Float''' is used to store a 32 bit decimal number, which must be defined as being a float using "F" or "f" to distinguish it from a double, or it may cause compilation errors. | ||
| + | |||
| + | <syntaxhighlight lang="csharp">float example = 9.4F;</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Long integer''' is also used to store whole numbers (However these are 64 bit values). | ||
| + | |||
| + | <syntaxhighlight lang="csharp">long example = 7846354759340276482;</syntaxhighlight> | ||
| + | |||
| + | |||
| + | '''Constants''' are used to create a variable of a specified data type that can never be changed after declaration, all global variables should be declared constant. The only way to change it is to edit the code and re-compile. | ||
| + | |||
| + | <syntaxhighlight lang="csharp">const int example = 32</syntaxhighlight> | ||
| + | |||
==Selection== | ==Selection== | ||
Revision as of 08:46, 20 June 2019
Contents
General Skills
Helloworld
Constants - Variables - Data Types
There are 9 types of data types. These include:
- boolean
- string
- integer
- double
- decimal
- character
- byte
- float
- long
To declare a variable you state the data type followed by the name of the variable:
DataType VariableName;
You can declare and assign a variable at the same time:
DataType VariableName = Value;
Examples
Boolean is a binary value, being either true or false.
bool example = true;
String is used for storing characters in word form.
string example = "hello world";
Integer is used to store whole numbers (32 bit values).
int example = 457568368;
Double is used to store numbers where there are numbers before and after the decimal point, using 64 bits of memory.
double example = 3.3;
Decimal is used to store larger numbers with information before and after the decimal point, using 128 bits of memory.
decimal example = 12.593;
Character is used to store single letters.
char example = 'A';
Byte is used to store a byte (eight bits). In C#, it is specifically an 8 bit integer (0-255).
byte example = 255;
Float is used to store a 32 bit decimal number, which must be defined as being a float using "F" or "f" to distinguish it from a double, or it may cause compilation errors.
float example = 9.4F;
Long integer is also used to store whole numbers (However these are 64 bit values).
long example = 7846354759340276482;
Constants are used to create a variable of a specified data type that can never be changed after declaration, all global variables should be declared constant. The only way to change it is to edit the code and re-compile.
const int example = 32
