Although this is C program. But prime number logic will be same for C and Java both Prime number Each natural number that is divisible only by 1 and itself is prime. Also, 2 is the first prime number. For example, we want to test that number 100 is a prime number or not. we … Read more
First you need to understand the mathematics behind it. Any number (that is a whole number, without a fraction part like for example 1.5) will give the reminder 0 when divided by one: n % 1 == 0 This condition will therefore always be true. If your case, once you are at n = 1, … Read more
The range function creates an array of numbers between its parameters. For example: >>> range(1, 4) => [1, 2, 3] In your code you’re saying a%b which is finding the remainder between a number the user inputted and a range object. Think of the range object as a python list. So what you’re doing is … Read more
while (aPhrase[i]) { c = aPhrase[i]; if (isVowel(c)) c=”!”; else if ((i % 3) == 0) c = toupper(c); putchar(c); ++i; } solved C++ How do you make every third letter of a char array into an uppercase letter? [closed]
To check if number is prime you have to validate is it devisible by any number in range [2, sqrt(n)]. Following code does exactly the same: import math def is_prime(n): for i in range(2, int(math.sqrt(n))+1): if n % i == 0: return False return True This method is good for small number, but if n … Read more
I did sthg like this; I write two for loop to scan both side, and a prime method to find prime numbers. public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int minPrime = 0; int maxPrime = 0; System.out.println(“Please give a number “); int number = scanner.nextInt(); for (int i = number … Read more
These are two tasks: get the list of primes (or just something like nextPrime(int)) and get the triangle, both are very simple. For the implementation of first, you may look at Next Prime number Java only working with certain numbers For the implementation of second, just do something like: for (int i = 1; i … Read more
First for future reference you should probably post that on code review, unless there is a specific problem then you should create a Minimal, Complete, and Verifiable post. There is nothing inherently wrong other than you do not check that N>0 which could lead to an infinite loop, j should be going to i not … Read more
This does feel a lot like a school project/task rather than anything meaningful. There are libraries built into Ruby that you can use for high performance Prime calculations puts “Enter the maximum number of the range in which to find the prime numbers: ” last = gets.chomp.to_i prime = [2] all_numbers = (2..last).to_a print “We … Read more
121 = 11 * 11 would be the first non-prime listed as prime by your code. So your code is only a solution up to n = 120. I.e.: No. 3 solved Is this a good approach for finding number of prime numbers within a certain range? [closed]
Here’s a way with nested loops (semi-pseudocode): int x ; //check if x is a multiple of any two factors < x for (int i1 = 2 ; i1 < x ; i1++) { for (int i2 = i1 ; i2 < x ; i2++) { prod = i1 * i2 ; if (prod > … Read more
This was a trick question: you are supposed to use recursion, but unless you are barred from using loops, a classic solution with a for loop can be made to comply with the recursion requirement. Here is a function isPrime that has a single argument and uses a classic loop and recursion to test prime … Read more
I am guessing you were translating this from another language? You really should have pointed out which lines were failing and what you researched. The “”: Smart quotes. This is typical of when copying between applications, so be careful. The speech marks for use in the visual basic editor need to be “” in order … Read more
Just a small improvement based on your code to find limit primes instead of limit numbers. limit = 1000 def is_prime(n): for i in range(2, n): if n%i == 0: return False return True sum = 0 num = 2 for i in xrange(limit): while not is_prime(num): num += 1 sum += num num += … Read more
isPrime is being used to exit from the for loop & do while loop by conditionally. 1. in For Loop Our goal is to find out the next greater prime number of candidate. If we have the 25 as candidate, we are going to execute the for loop upto 3 to 5(sqrt of 25). if … Read more