Programming Articles - Page 2831 of 3366

In this section we will see how to see the Host name and IP address of the local system in an easier way. We will write a C program to find the host name and IP.Some of the following functions are used. These functions have different task. Let us see the functions and their tasks.FunctionDescriptiongethostname()It finds the standard host name for the local computer.gethostbyname()It finds the host information corresponding to a host name from host databaseiten_ntoa()It converts an IPv4 Internet network address into an ASCII string into dotted decimal format.Example Code#include #include #include #include #include ... Read More

The wheel Sieve method is used to find the prime numbers within a given range. Wheel factorization is a graphical method for manually performing a preliminary to the Sieve of Eratosthenes that separates prime numbers from composites. In this method, prime numbers in the innermost circle have their multiples in similar positions as themselves in the other circles, forming spokes of primes and their multiples. Multiple of these prime numbers in the innermost circle form spokes of composite numbers in the outer circles. In this article, we have set the limit to 100. Our task is to implement the ... Read More

Emulating an n dice roller refers to rolling n number of dice simultaneously. In each roll, all the dice will return a different value from 1 to 6. In this article, we are having 'n' number of dices, our task is to emulate rolling n dices simultaneously. The approaches are mentioned below: Using Loop with rand() Function Using Recursion Using Loop with rand() Function In this approach, we have used the rand() function to generate a random value of dice in each roll. The srand() function with time() is ... Read More

Here we will see how to generate hollow pyramid and diamond patterns using C. We can generate solid Pyramid patterns very easily. To make it hollow, we have to add some few tricks.Hollow PyramidFor the pyramid at the first line it will print one star, and at the last line it will print n number of stars. For other lines it will print exactly two stars at the start and end of the line, and there will be some blank spaces between these two starts.Example Code#include int main() {    int n, i, j;    printf("Enter number of lines: ... Read More

In this section we will see how to make a digital clock using C. To work with time we can use the time.h header file. This header file has some function signatures that are used to handle date and time related issues.The four important components of time.h is like belowsize_t This size_t is basically the unsigned integral type. This is the result of sizeof().clock_t This is used to store the processor timetime_t This is used to store calendar timestruct tm This is a structure. It helps to hold the entire date and time.Example Code#include #include int main() { ... Read More

The multiply-with-carry method is a variant of the add-with-carry generator introduced by Marsaglia and Zaman (1991). The main advantages of this method are that it invokes simple computer integer arithmetic and leads to a very fast generation of sequences of random numbers with immense periods, ranging from around 260 to 22000000. In this article, our task is to generate random numbers using the multiply-with-carry method. Here is the formula of multiply-with-carry method: Multiply With Carry (MWC) Formula The multiply-with-carry formula is as follows: Xn = (a * Xn-1 + Cn-1) mod 232 Cn = (a * Xn-1 + Cn-1) ... Read More

The PGM is the Portable Gray Map. If we want to store a 2d array in C as images in PNG, JPEG, or any other image format, we have to do lots of work to encode the data in some specified format before writing into a file.The Netpbm format gives an easy and portable solution. The Netpbm is an open source package of graphics program and it is used basically in linux or Unix platform. It also works under Microsoft Windows systems.Each file starts with a two-byte magic number. This magic number is used to identify the type of the ... Read More

The Naor-Reingold pseudo-random function uses a mathematical formula for generating random numbers using an array of secret keys('a') and bits of an input number('x'). The generated random numbers can be repeated based on the array of secret keys. In this article, our task is to generate random numbers using the Naor-Reingold pseudo-random function. Formula of Naor-Reingold function The formula for generating random numbers using Naor-Reingold Pseudo-Random Function is given below: Example Here is an example of generating 5 random numbers using Naor-Reingold Function: Input: p = 31, g = 3, n = 4, a = [1, ... Read More

In this program we will see how to validate an IP address using C. The IPv4 addresses are represented in dot-decimal notation. There are four decimal numbers (all are ranging from 0 to 255). These four numbers are separated by three dots.An example of a valid IP is: 192.168.4.1To validate the IP address we should follow these stepsTokenize the string (IP address) using the dot “.” delimiterIf the sub strings are containing any non-numeric character, then return falseIf the number in each token is not in range 0 to 255, then return falseIf there are exactly three dots and four ... Read More

In this article we will see how we can print some characters without using any kind of format specifiers. The format specifiers in C are %d, %f, %c etc.These are used to print characters and numbers in C using the printf() function.Here we will see another way to print characters without using %c format specifier. This can be done by putting ASCII values directly in hexadecimal form.Example Code#include main () { printf("\x41 "); //41 is ASCII of A in Hex printf("\x52 "); //41 is ASCII of A in Hex printf("\x69 ... Read More