As described in problem statement, we have two linked lists represents as decimal numbers. We aim to find its sum as a linked list. Let us understand this with an example. We can solve this problem in two different ways. Digit by digit sum calculation. Converting a list to the number and calculate the sumRead More »
To obtain the sum of the digits in an input number, we can use the modulus operator (with 10) to divide each digit and add the results together. Let’s explore this concept with an example. We can solve this problem both iteratively and recursively; let’s take a look at the code for both methods. RecursiveRead More »
We are given a linked list of integers and an integer, which we want to calculate occurrences. We aim to find the count of events of the object in the linked list. To find the count of occurrences, we simply iterate over each item and checks if the current thing is equivalent to the givenRead More »
As a first step to solve this problem, we need to have a file descriptor with a read (“r”) mode to read the contents of the file. In this problem, we need to read each character and need to check if that character is in capital letter boundary (i.e., between ‘A’ to ‘Z’). If so,Read More »
A Data Type in C is a metadata that represents the program data, which also tells the compiler or interpreter about the data. These data types also defines all its proper operations on corresponding data. Every variable that we use in the C Program created with specific data types. Based on the type of dataRead More »
Array is a data type to store similar types of elements in contiguous memory segments, pictorial representation of arrays is as shown below. Above array of 7 integers represents with variable “a” is {1, 5, 1, 2, 6, 8, 3} starts at address 1000. In a 32bit machine size of an integer value is 4bytesRead More »
Let us take two linked lists which at some point merge as one list. Our goal is to find the point where the given two linked lists merging. The most optimized solution for this problem is to find the maximum length list and jump each node until both lists length becomes the same. Below isRead More »
Every C program starts with an implicit function _start(), which calls the function main implicitly. If we don’t provide function “main” in the C program, the compiler throws “_main” undefined symbol from entry error. Any program written in C should provide the main function to compile it properly. We can write a hack before preprocessorRead More »
Allocating dynamic memory using malloc & calloc is a basic functionality of any C program. Whereas allocating a 2D dynamic memory is a complex task to C beginners. Here in this article, we will see how to allocate memory for a two-dimensional integer pointer using malloc. First of all let us write a simple 2×3Read More »
One of the fundamental databases for C programming is Files (IO). In this article we are going to count the number of lines in a given file. Function reads the FILE pointer as an input argument and returns the count of lines in the given file pointer. To finish this requirement we are going toRead More »
sizeof operator is one of the most useful C operators to find the size of any operator or variable in bytes. This usually takes the difference between the next and current address of the given variable. To understand this in a better way, let us take a variable array with 5 elements. Now, lets printRead More »
Given a file with all types of characters. Our aim here is to convert file contents into their upper case. Let us take below example program file and convert its content to capital letters. Our program should convert this file as shown below. To solve this problem, we need to have a temporary file thatRead More »
Given an array of binary (0 or 1) numbers, we aim to sort that binary array in ascending order with minimum possible complexity. Let us take the below example requirement. We can sort these binary elements iteratively. In every iteration we swap left-most “1” with rightmost “0”. This iteration continuous until right most “0” indexRead More »
This article demonstrates how to get all characters in a text file in reverse order using the C program. Let us take below the example text input file and expected outputs. Our C program should display the above file in reverse order as shown below. Let’s write the C program to solve the above requirement.Read More »
Before we start learning C programming, it is good to understand how the memory of a C program organizes. Every C program contains five types of memory in it. TEXT/CODE Segment. DATA Segment. UNINITIALIZED DATA (B SS) Segment. HEAP Segment. STACK Segment. These memory segments from top to bottom arranged from low memory to highRead More »