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Pointers in C

A pointer is a variable that stores the memory address of another variable. They are essential in C for dynamic memory allocation, array manipulation, and implementing complex data structures.

1. Declaring and Initializing Pointers

A pointer variable must be declared to hold the address of a specific data type.

A. Declaration

The asterisk (*) is the dereference operator or value-at-address operator. When declaring a pointer, it signifies that the variable is a pointer to a specific type.

data_type *pointer_name;

• Example: int *ip; // Declares ip as a pointer that can hold the address of an integer variable.

B. Initialization

A pointer is initialized by assigning it the address of a variable using the address-of operator (&).

int num

That's a great request! C is a foundational language in computer science. Here is a comprehensive look at C, covering its history, importance, structure, and fundamental components.
📜 History of C
C is a general-purpose, procedural computer programming language developed in the early 1970s by Dennis Ritchie at Bell Labs.
 

• Origin: It was primarily developed to write the UNIX operating system, which was previously written in assembly language.
• Predecessors: C evolved from earlier languages:
  • ALGOL 60 (1960)
  • CPL (Combined Programming Language, 1963)
  • BCPL (Basic CPL, 1967)
  • B (developed by Ken Thompson, 1970)
• Standardization: The language was later standardized by the American National Standards Institute (ANSI) in 1989, resulting in ANSI C or C89. This

📏 One-Dimensional Arrays

A one-dimensional array is a linear collection of elements of the same data type, stored in contiguous memory locations.

Declaration

Declaring an array tells the compiler its name, data type, and size.

data_type array_name[size];

Example:

int scores[5];  // Declares an array named scores that can hold 5 integers.

Initialization

You can initialize an array at the time of declaration or assign values later. Methods:

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This document provides a detailed, exam-ready note sheet covering essential topics in digital electronics, including key points, formulas, comparisons, and revision tips. The content is structured for quick and effective study.

R-2R Digital-to-Analog Converter (DAC)

Definition:
A digital-to-analog converter that converts a binary input to an analog voltage using only R and 2R resistors. This design is common in ICs due to its simplicity and accuracy.

Operation:

• Each bit controls a switch connecting to Vref (1) or GND (0).
• The ladder network ensures each bit contributes a weighted current.
• Output voltage formula:

V_{out} = V_{ref} \times \frac{D}{2^n} \quad (D = \text{decimal equivalent of input})

Advantages:

• Only two resistor values, simplifying IC fabrication.

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Essential English Grammar: Verb Patterns

Verbs Followed by Gerund (V + ING)

These verbs require the gerund form (V + ING):

• love, hate, like, be good at, admit, appreciate, avoid, can’t help, consider, delay, deny, discuss, dislike, enjoy, finish, give up, imagine, involve, mention, mind, miss, practice, and suggest.

Verbs Followed by Infinitive (To + Verb)

These verbs and phrases require the to + infinitive form:

• afford, agree, appear, arrange, ask, attempt, be careful, choose, be difficult, decide, expect, fail, happen, help, hope, intend, learn, manage, offer, need, plan, prepare, pretend, promise, refuse, seem, tend, tell, want, wish, and would like.

Verbs Followed by Bare Infinitive (Base Form)

The bare infinitive is used with:

• Modal verbs (e.

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Key Acts and Sections Related to Sexual Crimes