An important Keywords list in C Programming Language for software developers should know. Keywords are reserved terms in programming that have a specific meaning for the compiler. Keywords are part of the syntax and can’t be utilized to identify something. Keywords are reserved terms in programming that have a specific meaning for the compiler. Keywords are part of the syntax and can’t be utilized to identify something.
Auto – The auto keyword can be used to declare a variable with a complicated type in a simple fashion. You can use auto to declare a variable if the initialization phrase contains templates, pointers to functions, or references to members, for example.
Const – The “const” keyword can be used before the datatype of a variable to define it as a constant. The constant variables can only be set up once. Constant variables have a default value of zero. Any variable can be declared with the qualifier const to indicate that its value will not be modified. We can alter the value of a const variable by using a pointer, depending on where the const variables are stored.
Break – In C, the break keyword is used to remove the program control from the loop. Inside loops or switch statements, the break statement is utilized. The break statement breaks each loop one by one, therefore in nested loops, the inner loop is broken first, followed by the outer loops.
Case – A switch statement allows a variable to be compared against a list of values for equality. Each value is referred to as a case, and each switch case is compared to the variable that is being turned on.
Char – In several programming languages, such as C, C++, C#, and Java, the abbreviation char is used as a reserved keyword. It stands for character, a data type that can carry only one character of data. In C, this is the most fundamental data type. In virtually all compilers, it stores a single character and requires a single byte of memory. int: An int variable is used to store an integer, as the name suggests.
Continue – In C programming, the continue statement is similar to the break statement. Instead of terminating the loop, it compels the next iteration to begin, bypassing any code in the interim. The conditional test and increment components of the for loop are executed when the continue statement is used.
Default – If no case constant-expression value equals the value of expression, the default statement is executed. None of the lines in the switch body are executed if there is no default statement and no case match is detected. It’s not necessary for the default statement to be at the end.
Do – The do while loop is a loop that has been post-tested. We can repeat the execution of many sections of the statements using the do-while loop. The do-while loop is mostly utilized when the loop must be executed at least once. The do-while loop is commonly employed in menu-driven programs where the end user determines the termination condition.
Double – In the C programming language, a double is a data type for storing high-precision floating-point data or integers in computer memory. It’s named a double data type because it can carry twice as much data as a float data type. Double has a range of 1.7E-308 to 1.7E+308.
Else – An else statement is an alternate statement in programming languages that is performed if the outcome of a prior test condition evaluates to false.
Enum – In C, enumeration (also known as enum) is a user-defined data type. It’s mostly used to give integral constants names, which make a program easier to comprehend and maintain. A set of values is referred to as an enumeration. You can use enumerations to generate sets of constants for use with variables and properties because they are treated as data types.
Extern – The extern keyword is used to make variables and functions more visible. The usage of extern in function declarations or definitions is unnecessary because functions are visible throughout the program by default. Its application is self-evident. When you use extern with a variable, you’re merely declaring it, not defining it.
Float – A decimal number that represents a signed real number is known as a “floating-point constant.” A signed real number is represented by an integer portion, a fractional portion, and an exponent. To represent floating-point values that can’t be modified, use floating-point constants.
For – The for statement allows you to specify how many times a statement or compound statement should be repeated. A for statement’s body is executed one or more times until an optional condition is met.
Goto – The goto statement is a type of jump statement that is also known as an unconditional jump statement. Within a function, the goto statement can be used to jump from one place to another. goto is a program control transfer function that moves the program control to a predetermined label. The goto statement is used to repeat a section of code for a certain circumstance. It can also be used to break many loops that a single break statement couldn’t handle.
If – The block of code inside the ‘if’ statement will be executed if the Boolean expression evaluates to true. If the Boolean expression evaluates to false, the first set of code after the closing curly brace after the ‘if’ statement is performed.
Int – In computer programming, an integer is a data type that is used to represent real numbers that do not contain fractional values. In several common programming languages, a small integer, for example, has a range of 32,767 to -32,768.
Long – The Long datatype is represented by the term long in Java. The long data type is a 64-bit two-s complement integer with the following properties: 64-bit size.
Register – Because registers are faster to access than memory, the most frequently used variables in a C program can be placed in registers using the register keyword. The keyword register indicates to the compiler that a variable can be stored in a register. It is up to the compiler to decide whether or not to save it in a register.
Return – The return statement marks the end of a function’s execution and hands control back to the calling function. The calling function continues execution at the place where the call was made. The calling function can also get a value via a return statement.
Short – short is the abbreviation for “short integer.” They are interchangeable. The data types short, short int, signed short, and signed short int are all the same.
Signed – In computer programming, the phrase “signed” denotes that a variable can have both negative and positive values. Most numeric data types, including int, char, short, and long, can be used with this feature.
Sizeof – The sizeof keyword is a compile-time operator for determining the size of a variable or data type in bytes. The sizeof operator can be used to find the size of any user-defined data type, including classes, structures, unions, and arrays.
Static – The keyword static is used in the C programming language. It can be used with both variables and functions, allowing us to declare a static variable as well as a static function. The scope of a regular variable is confined to the scope in which it is defined, but the scope of a static variable is unlimited.
Struct – The C programming language allows programmers to send a single or whole structure to or from a function. Function parameters can be used to pass structure information. The structure variable can be referenced or supplied as a value. Using the return statement, the function will return the value.
Switch – Long if statements that compare a variable to numerous integral values can be replaced with switch case statements. A multiway branch statement is the switch statement. It makes it simple to route execution to different areas of code based on the expression’s value.
Typedef – The typedef keyword is used in C programming to give meaningful names to variables that already exist in the program. It works similarly to how we construct aliases for commands. In a nutshell, this keyword is used to change the name of a variable that already exists.
Union – In the C programming language, a union is a user-defined datatype. It’s a collection of variables with various datatypes stored in the same memory region. C unions allow mutually exclusive data members to share the same memory. When memory is valuable, such as in embedded devices, this is critical.
Unsigned – Unsigned char is a character datatype in which the variable occupies all of the memory’s 8 bits and has no sign bit which is there in signed char. As a result, the unsigned char data type has a range of 0 to 255.
Void – The void keyword, when used as a function return type, indicates that the function does not return a value. When used as a parameter list for a function, void indicates that the function takes no parameters. When void is used in a pointer declaration, it indicates that the pointer is “universal.”
Volatile – In C, a volatile keyword is just a qualifier that a programmer uses when declaring a variable in source code. It’s used to tell the compiler that the variable value can be updated at any time without the source code having to do anything. When we declare a variable, we commonly use the word volatile.
While – The while statement allows you to iterate over a statement until a defined expression is false.