Linked Questions

Possible Duplicates: C - determine if a number is prime Is there any way to test easily in C whether a selected number is prime or not?

I'm currently learning c++ for the first time and I've written a cpp bool function to find if an integer is a prime number. The code was: bool isPrime(int n) { for (int i = 2; i < n; i++) { ...

This is C program. This is my code in the below. I used nano in terminal. When I compile and test with ./a.out 9872349901 but it's took me exact one minute to get a result... Does anybody know why is ...

Can anyone help me out? I am trying to test primality but I cant seem to get this to work. For whatever reason, whenever I run it, it runs fine as long as I start with a number that is not prime. ...

In C, why is signed int faster than unsigned int? True, I know that this has been asked and answered multiple times on this website (links below). However, most people said that there is no difference....

I'm creating a basic prime number checker, based on C - determine if a number is prime , but utilising OpenMP. int isPrime(int value) { omp_set_num_threads(4); #pragma omp parallel for ...

Generating Prime numbers is a toy problem that I often attempt from time to time, especially when experimenting with a new programming language, platform or style. I was thinking of attempting to ...

I started learning C the previous day and I wrote a program to print within a given range. Minimum and Maximum of range is given by user. #include <stdio.h> int check(int number) { if (...

My question is about the conditional test in trial division. There seems to be some debate on what conditional test to employ. Let's look at the code for this from RosettaCode. int is_prime(...

Well, the problem is the above. To sum it up, it compiles, but I guess my main idea is just wrong. What I'm trying to do with that code is: I want the person to give us the elements of the array, how ...

int prime(unsigned long long n){ unsigned val=1, divisor=7; if(n==2 || n==3) return 1; //n=2, n=3 (special cases). if(n<2 || !(n%2 && n%3)) return 0; //if(n<2 || n%2==0 || n%...

I used the following code and it showed numbers like 49 as prime and not composite. I am new to programming so please help me with the correct code. #include <stdio.h> int main() { int n; ...

So, I'm just practicing something in C language (I'm a beginner), but I'm now stuck on this program: #include <stdio.h> #include <string.h> int main(){ int numbers[12] = {2, 3, 5, 7, ...

I have written the following code to compute the greatest prime factor of a number supplied through standard input but it is taking ages to execute.How can i reduce the execution time of the program? ...