### Constants and Variables in C

#### Constants in C: Constants are the terms that can't be changed during the execution of a program.

Examples: Integer Constants: 0, 1, 2, 3, 4, 5, 6, 7 . . . . . . .
Floating Constants: 0.0, 0.1, 0.2, 0.3, -0.4, 0.5, 5.1546, 2.5465, -1.02545 . . . . . . .
Character  Constants:  Character  constants  are  the  constant  which  use  single  quotation  around
characters. For example: 'a', 'l', 'm', 'F' etc.

#### Basic Data Types in C:

Char: a single byte that can hold a character (‘a’, ’b’, ’c’, ’d’, ’e’ . . . . . . . )
Int: An Integer can hold 2 or 4 byte integers (0, 1, 2, 3, 4, 5, 6, 7 . . . . . . .)
Float: A float can hold 4 byte floating points (0.0, 0.1,0.2, 0.3, -0.4,0.5,5.1546, 2.5465, -1.02545 . . .)
Double: Double is same as float just the difference is it can hold up to 8 byte (0.0, 0.1, 0.2, 0.3, -0.4,
0.5, 5.1546, 2.5465, -1.02545 . . . . . . .)

#### Rules for writing variable name in C:

The first letter of a variable should be a letter, Variable name can be made up of both uppercase and lowercase letters, digits and underscore (_) only.
Examples:

 Declaration of Variable #include void main(){int a1, a2;int a_1;} #includevoid main ( ){ char b_1;double db;} #includevoid main(){float a_1, b2, b3, b4;char jvh;} a1, a2 and a_1 are declared as integer now they can store integers. b_1 and db are declared as char and do uble respectively now b_1 can store characters(fonts) and db can store fractioned numbers. Here a_1, b2, b3, b4 can store floating points and jvh can store charac

 Initialization of Variable #includevoid main ( ){float b1 ;b1 = 2.302;double a;a = 7.202;} #includevoid main ( ){ char b_1 ;b_1 = ‘r’;int a;a = 7;} #include void main(){int a1 = 5;int b1;b1 = 5; } B1 and a are declared and initialized. Here b_1 is stores / initialize rAnd a store’s 7 .. a1 is initialized during declaration and b1 firstly initialize then declare on second line.

1. Injection molding is essentially the most generally used manufacturing process for the fabrication of plastic parts. A extensive variety of products are manufactured using injection molding, which range tremendously in their measurement, complexity, and application. The injection molding process requires utilization of} an injection molding machine, uncooked plastic materials, and a mould. The plastic is melted within the injection molding machine and then injected into the mould, where it cools and solidifies into the ultimate half. The steps on this process are described in greater detail within the subsequent section. The trade expanded quickly within the Nineteen Forties outcome of|as a end result of} World War II created a huge demand for inexpensive, Mittens mass-produced products.