Klase Notes

Keywords are also known as reserved words. Have standard, predefined meanings and must be used only for their intended purpose. Therefore, these keywords should not be used as identifiers in the program.

Basic Data Types of C

Modifier is used to alter the meaning of the base type to fit the needs of various situations more precisely. The list of modifiers includes the following:

Escape Sequence always begin with a backslash \ and is followed by one or more special characters.

Variable Declaration

Whatever data type all variables and constants must be declared prior to their use. General declaration is

type variable_name;

Examples:

int age; //declares age as an integer variable

char ch; //declares ch as a character variable

float amount; //declares amount as a floating-point variable

Character Constants : ‘$’ ‘*’ ‘z’ ‘G’

String Constants: “Name: “ “Address:” “Zip Code”

Variables with the same data type can be placed in the same statement, separated by commas.

int x, y, z;

float amount, total;

Initializing Variables

//Variable Declaration

int x, y;

float amount, total;

//Variable Initialization

x = 10;

y=0;

total = 0;

Kinds of Variable

Local Variables are variables that are declared inside a function. It can only be referenced by statements that are inside the block in which the statements are declared.

Global Variables are variable that are known throughout the entire program and may be used by any piece of code. Global variables are created by declaring them outside of any function.