C Programming Part 1

Reserved words that have a specific meaning in the language. Examples: int, return, if, while, and for

Specifies the type of data that a variable can hold. Examples: int, float, char, double, and void

A block of code designed to perform a specific task. Examples: main(), printf(), scanf(), and strlen()

A sequence of characters used to represent special characters. Examples: \n, \t, and \r

Specifies the type of data to be used in various I/O operations. Examples: %d, %f, %c, and %s

A user-named storage location for storing data values. Examples: int pizza; float large;

An immutable value defined in the program. Examples: const int max = 100; #define PI 3.14159

Symbols that perform operations on variables and values. Examples: +, -, *, /, %, ==

A control structure that repeats a block of code. Example: for, while, do-while

Statements that perform different actions based on conditions. Examples: if, else, switch, and case

A collection of elements identified by index or key. Examples: int arr[5]; char name [10];

A variable that stores the memory address of another variable. Examples: int *p; char *str;

A user-defined data type containing multiple data types. Example: struct Student { int id; float grade; };

A data structure that can hold different data types, but only one at a time. Example: union Data { int i; float f; char c; };

Instructions to the compiler before actual compilation. Examples: #include, #define, #ifdef, #ifndef

A user-defined data type that consists of integral constants Example: enum Days {Sun, Mon, Tue, Wed, Thu, Fri, Sat};

Converting one data type to another, explicitly. Examples: (int) 3.14, (float) 5

Defines a new name for an existing data type. Example: typedef unsigned char BYTE;

Values passed into a function. Example: void greet(char name[], int age);

Actual values supplied to a function's parameters. Example: greet("Alice", 30);