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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


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