C
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 (note the double quotes "").
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 (note the single quotes ).
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
