C Keywords
C Keywords
A list of useful C keywords can be found in the table below.
| Keyword | Description |
|---|---|
| break | Breaks out of a loop or a switch block |
| case | Marks a block of code in switch statements |
| char | A data type that can store a single character |
| const | Defines a variable or parameter as a constant (unchangeable) |
| continue | Continues to the next iteration of a loop |
| default | Specifies the default block of code in a switch statement |
| do | Used together with while to create a do/while loop |
| double | A data type that is usually 64 bits long which can store fractional numbers |
| else | Used in conditional statements |
| enum | Declares an enumerated type |
| float | A data type that is usually 32 bits long which can store fractional numbers |
| for | Creates a for loop |
| goto | Jumps to a line of code specified by a label |
| if | Makes a conditional statement |
| int | A data type that is usually 32 bits long which can store whole numbers |
| long | Ensures that an integer is at least 32 bits long (use long long to ensure 64 bits) |
| return | Used to return a value from a function |
| short | Reduces the size of an integer to 16 bits |
| signed | Specifies that an int or char can represent both positive and negative values (for int this is the default so the keyword is not usually necessary) |
| sizeof | An operator that returns the amount of memory occupied by a variable or data type |
| static | Specifies that a variable in a function keeps its value after the function ends |
| struct | Defines a structure |
| switch | Selects one of many code blocks to be executed |
| typedef | Defines a custom data type |
| unsigned | Specifies that an int or char should only represent positive values which allows for storing numbers up to twice as large |
| void | Indicates a function that does not return a value or specifies a pointer to a data with an unspecified type |
| while | Creates a while loop |
