Object Oriented Programming

GATE

Data Structures

Data Structures in Python

Power BI

Data Science

Django

Data Structure and Algorithm

Python

Recursion

Arrays

Searching

Sorting

String

Linked List

Data Structures in C

Maths

Strings

C++ Tricks

System Design

Theory of Computation

Computer Organization and Architecture

Operating System

Engineering Mathematics

Database

Digital Logic

Computer Networks

GATE 2022

Java

GeeksforGeeks School

Hashing

Competitive Programming

Problem of the Day

School

HTML

Javascript

Bootstrap

Web Development

Android

Microsoft Office

Machine Learning

Resume Builder

Miscellaneous

Gblog

TechTips

React

Advanced JavaScript

DSA Self Paced

CS-subjects

Data Structures and Algorithms

Operating Systems

C Language

DBMS

Basics of CPP

Data Structures ( Basics )

Object Oriented Design

Dynamic Programming

Data Interpretation and Logical Reasoning

Algorithms

Core Java

RESTful APIs

Spring Basics

CPP-Tricks

Basics of Java

Aptitude

GATE YT

Flutter

Application Development

Blockchain

GFG SDE Sheet

SDE Sheet

Deep Learning

Go Programming

Placement

C++ Programs

Data Visualisation

DevOps

Docker

Queue

Matrix

Trie

Stack

Graph

Tree

Magic Numbers

Divide and Conquer

React Native

React JS

Interview-Questions

Advanced Java

cloud-computing

income tax

Artificial Intelligence

Programming Languages

Computer Graphics

Cyber Security

Project Management

ML & Data Science

Interview Corner

CS Subjects

Software and Tools

School Learning

Practice Coding Problems

Tutorials

DSA / Placements

Development

Cloud / DevOps

All Courses

Courses

JavaScript

Languages

GfG 160

GfG 360

Core Subjects

Interview Questions

Interview Puzzles

Aptitude and Reasoning

Interview Preparation

Data Analytics

Complete Data Science

Full-Stack Web Dev

Software Testing

CyberSecurity

Dev Skills

Computer Fundamentals

AI Tools

MS Excel & Google Sheets

MS Word & Google Docs

Tools

Maths For Computer Science

Tracks

The sizeof operator in C is a compile-time unary operator used to calculate the size of its operand in bytes. It works with data types, variables, and expressions, returning a result of type size_t. Commonly used for memory management, its output may vary based on the machine architecture. The operator ensures optimized memory allocation in C programs.&nbsp; For more details, check out the <a href="https://www.geeksforgeeks.org/sizeof-operator-c/">full article here</a>.

sizeof Operator in C

In this video, we will write a C program on how to reverse a number. Examples: Input N= 54321 Output n= 12345 Here, we reverse a number using two different methods: 1. Using While loop 2. Using the recursion function Using While loop: Step 1: Take the number’s modulo by 10. Step 2: Multiply the reverse number by 10 and add the modulo value to the reverse number. Step 3: Divide the number by 10. Step 4: Repeat the above steps until the number becomes zero. Using the recursion method: The recursion method allows you to repeat an instruction or statement a set number of times. Step 1: If the number becomes zero then terminate the recursion, this will be the base condition. Step 2: Take the modulo and add it with the ‘rev*10’ multiplying. Step 3: Divide the number by 10 and call the reverse function on this number after updating it to number/10. Apart from that, we will see the time and space complexity of both the methods, i.e Time complexity = O(log(N)) Space complexity = O(log(N)) &nbsp; C Program to reverse the digits of a number using recursion <a href="https://www.geeksforgeeks.org/c-program-to-reverse-the-digits-of-a-number-using-recursion/">https://www.geeksforgeeks.org/c-program-to-reverse-the-digits-of-a-number-using-recursion/</a>

Write a C Program to Reverse a Number

In this video, we will see a C program to count digits in an integer.&nbsp; Here's the approach that we can follow: Step 1: Consider a number N. Step 2: Remove the last digit of the number by dividing it with 10. Step 3: Increase the count of digits by 1. Step 4: Repeat steps 2 and 3 untill the value of N becomes 0. Here we see iterative method to calculate count digits in an integer: 1. Using while loop: The integer entered by the user is stored in the variable n. Then the while loop is iterated until the test expression n != 0 is evaluated to 0 (false). For Examples: Input: 6785 Output: 4 Input: 787646678 Output: 9 C Program to count the digits of a number: <a href="https://www.geeksforgeeks.org/c-program-to-count-the-digits-of-a-number/">https://www.geeksforgeeks.org/c-program-to-count-the-digits-of-a-number/</a>

Count the Digits in a Number | C Program

In this video, we will be writing a C Program to count the number of lines in a file. We will be using two approaches to do the same.Approach-1: Using fgetc() methodApproach-2: Using fgets() methodC Program to count number of lines in a file: <a href="https://www.geeksforgeeks.org/c-program-count-number-lines-file/">https://www.geeksforgeeks.org/c-program-count-number-lines-file/</a>

C Program to count number of lines in a file

In this video, we will write a C Program to Segregate Even and Odd numbers. Segregating even and odd numbers mean putting even numbers first and odd numbers last in the array.&nbsp; Example: Input: [12,9,4,7,2,13] Output: [12,4,2,9,7,13] Alternate Output: [12,2,4,13,7,9]<h2>Methods to Segregate Even &amp; Odd Numbers</h2>1) Using nested while loop 2) Using the Lomuto partition method 3) Using Two pointer method 1) Using nested while loop: In this method, first we find the pivot element. So we have two pointers starting from the first and last digits and both the pointers will move towards each other. Now we will swap the elements if they are not in the desired position. 2) Using the Lomuto partition method: In this method, we will have a single for loop and a variable to store the index. If the element is even. We will increment the variable and swap the position of the current index and the variable. 3) Using Two pointer method: In this method, we will use 2 pointers, the first will be pointed at the first element, and the last pointer at the last element. Then we will iterate over every element and if the pointers contain odd and even numbers respectively. We will swap them as bring an even number forward. If the numbers are in right place, we will just decrement the second pointer.

C Program to Segregate Even and Odd numbers

In this video, we will write a C Program to Calculate the Grade of Students. So the task is in given integer array marks, which comprises marks scored by a student( out of 100) in different subjects and assign a grade to the student. The grade is found out by taking the percentage of the marks scored by the student.The grade is calculated using the formula = Total number of marks scored/ Maximum number of all marksExamples: Input&nbsp; Marks = { 55, 65, 46, 58, 78, 65} Output: &nbsp;Grade CInput marks = { 95, 88, 98, 98, 92, 96} Output: Grade A Basic Algorithm:&nbsp;<ol><li style="text-align:justify;">First Initialize a variable to sum all the marks scored by the student, total to 0.</li><li style="text-align:justify;">Then Initialize a variable to store the grade of the student, grade to ‘ F ’.</li><li style="text-align:justify;">Now, we iterate through the marks array and find the total marks scored by the student.</li><li style="text-align:justify;">We apply the formula described above to calculate the percentage.</li><li style="text-align:justify;">We also make nested if else or Switch case statements to construct to assign proper grades to the student.</li></ol>

C Program to Calculate Grade of Student

In this video, we will write a C program calculate the angle between the hour hand and the minute hand. So basically, clock angle problems relate to two different measurements, angles and time. The angle is typically measured in degrees from the mark of number 12 clockwise. The time is usually based on a 12-hour clock. In a clock, the hour hand revolves around 2 times a day and the minute hand revolves around 24 times a day. We want to find the shortest angle (acute angle) between both these hands at any given time. Examples: Input: h = 9:00 m = 60.00 Output: 60 degree<h2>Methods to Calculate angle between the hour &amp; minute hand:</h2>1. Using the Reference method 2. Using Direct formula Using Reference method: In this method, we will count degrees moved for both hands with reference to 12:00 O' clock time when both hands overlap each other. After subtracting both degrees and taking the minimum answer as compared to 360 degrees scale. We will get our desired output. Using Direct formula: In this method, we have the formula to calculate the angle between both hands directly. As hour hand moves 30 degrees in 1 hour, The angle is 30 degrees H.&nbsp; In a minute, the angle between the minute hand is 360/60 = 6° &amp; the angle between the hour hand is 30/60 = 1/2° So, relative distance between both hands = (6-1/2) *M = 11/2 * M Thus formula = (30* H) - (11/2*M)

C program to calculate the angle between hour and minute hand

In this video, we will write a C program to print kite pattern. A kite pattern is a pattern of three different three triangles. So, we break our code into three parts, i.e., upper triangle, lower triangle , and tail.&nbsp; Algorithm:&nbsp; Step 1:Take input of valid integer from user i.e N.&nbsp; Step 2: First make the upper part of size N using for loop.&nbsp; Step 3 : Now make the lower part of size N.&nbsp; Step 4: Finally make the tail of kite(constant size)&nbsp; Step 5: Print pattern.&nbsp; Time complexity : O(n^2) for given input n&nbsp;

C program to print Kite pattern

In this video, we will write a C program to find the area and perimeter of a semicircle. Semicircle is a one-dimensional locus of points that forms half of a circle. The area of a semicircle is half the area of the circle from which it is made. Any diameter of a circle cuts it into two equal semicircles.&nbsp; Formula:&nbsp; Area of Semi-Circle = 1⁄2 * π *r2&nbsp; The perimeter of Semi-Circle = π *r&nbsp; where “r” is the radius of the semicircle.&nbsp; Examples:&nbsp; Semicircle Area and Perimeter:&nbsp; A = πr²/2 = 12.5 * π [cm²]&nbsp; ≈ 39.27 [cm²]&nbsp; Perimeter (L) = πr + d = 5 * π + 10 [cm]&nbsp; ≈ 25.708 [cm]&nbsp;<h2> Calculate Area &amp; Perimeter of Semicircle - 2 Approaches &nbsp;</h2>1) Using formula:&nbsp; Step 1: Take input R from the user.&nbsp; Step 2: Calculate the area and perimeter using a simple formula of the semicircle.&nbsp; Step 3: Print the result.&nbsp; 2) Using function:&nbsp; Step 1: Create user define function.&nbsp; Step 2: Calculate area and perimeter using function.&nbsp; Step 3: Print the result.&nbsp; The Time and Space complexity of both the approaches are O(1).

C Program to find the Area and Perimeter of a Semicircle

In this video, we will write a C Program to find the square root of a negative number.&nbsp;Here, given a negative number N, the task is to write a C program to find the square root of that given number N.Examples:Input: N = -9 Output: 3iHere we see 2 different methods for finding the square root of a negative number:<ol><li style="text-align:justify;">Using binary search</li><li style="text-align:justify;">Using Sqrt(number)</li></ol>Using binary search:Step 1: Firstly take the abs(number). Step 2: Now, initialized start = 0 and end = number. &nbsp; Step 3: Calculate the mid value by using mid = (start+end)/2. Step 4: If mid*mid = Number, then store mid in ans and exit the loop. Step 5: If mid*mid &lt; Number, then &nbsp;ans = start &nbsp;and start = mid+ 1;. Step 6:If mid*mid &gt; Number, then end = mid-1;. Step 7: We will get an integral part, and we will find the fractional part. Step 8: initialize the increment by 0.1 and iteratively calculate the fractional part up to 5 decimal places in ans. Step 9: For each iteration change increment to 1/10th of its previous value. Step 10: Finally return the ans and print ans i. Using Sqrt(Number): In the second method, we use the inbuilt sqrt() function to return the sqrt of the negative number N.Apart from that, we will see the Time and Space complexity of both methods: Using binary search: Time Complexity: Sqrt(N), Space Complexity: O(1) Using Sqrt(number): Time Complexity: Sqrt(N), Space Complexity:O(1)

C program to find square root of a negative number

In this video, we will write a C Program to turn an image by 90 degrees. Rotation of an Image is one of the image transfigures operations that can be applied to an image. By using Image rotation, the image is rotated about its center by a specified number of degrees.&nbsp;Rotation is a geometric conversion. This can be done by using either forward mapping or inverse mapping.For Example:Input image: 1 &nbsp;2 &nbsp;3 &nbsp;0 5 &nbsp;6 &nbsp;7 &nbsp;8 9 10 11 12 Output Image9 &nbsp; &nbsp; 5 &nbsp; &nbsp;1 10 &nbsp; 6 &nbsp; &nbsp;2 11 &nbsp; 7 &nbsp; &nbsp;3 12 &nbsp; 8 &nbsp; &nbsp;0Then we see 2 different approaches for turning the image 90 degrees:1. Using another array: In this approach, we've another array to store the rotated image of an array. Then we use nested for loop to store the 2D array. 2. Using the Inplace methodology: In this approach, rather than creating another array, we will exchange the elements in the original array image itself. So we switch the top element to right, the right element to the bottom, the bottom element to left, and the left element to the top to have 90 degrees rotated image of an array.Here,&nbsp;<ul><li style="text-align:justify;">Time Complexity O( N * M)</li><li style="text-align:justify;">Auxiliary Space O( N * M)</li></ul>C Program to turn an image by 90 degrees : <a href="https://www.geeksforgeeks.org/c-program-for-turn-an-image-by-90-degree/">https://www.geeksforgeeks.org/c-program-for-turn-an-image-by-90-degree/</a>

C Program to turn an image by 90 degree

In this video, we will write a C Program Convert Kilograms to Grams &amp; vice versa.Conversion of Kilograms to Grams: 1 kg = 1000 g The mass m in grams( g) is equal to the mass m in kilograms( kg) times 1000 m( g) = m( kg) × 1000 Example Convert2.5 kg to grams m( g) = 2. 5 kg × 1000 = 2450 gConvert Grams to Kilograms 1 g = 1/1000 kg The mass m in kilograms( kg) is equal to the mass m in grams( g) time1/1000 m( kg) = m( g)/ 1000 Example Convert 4783 g to kilograms m( kg) = 4783/ 1000 = 4.783 kgAlgorithm to Convert Kilograms to Grams: Step 1: Take two variables. Step 2: &nbsp;Take the value of the kilogram from the user and store it in the variable. Step 3: Multiply the kilogram value by 1000 and store the result in the output variable. Step 4: Print the value.Algorithm to Convert Grams to Kilograms:Step1: Take two variables for store value gram and kilogram. Step 2: Now take the value of the gram from the user and store it in the gram variable. Step 3: In this step divide the gram value by 1000 and store the result in the kilogram variable. Step 4: Print the value of the kilogram as output.

C Program to Convert Kilograms to Grams & vice versa

Practice Problems

Linux