C :: Calculate Prime Number Using Loops
Oct 10, 2013how would I write a while() loop that calculates the sum of all prime numbers from 1 - 50.
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C++ :: Finding Only Prime Numbers With For Loops
Feb 18, 2013A prime number is a number greater than 1 which is only evenly divisible by 1 and itself. For this assignment you will find which numbers from 2 to n (where n is a user-specified number) are prime. Ask the user for a number, n, greater than 2. Keep asking for a number until a number greater than 2 is provided. Assume that the user will only enter numbers (that is, you do not need to check if a user enters text).
Use a loop to iterate on a variable, i, from 2 through n. For each iteration, check all numbers from 2 through i to determine whether the number is prime. If it is prime, print out i and the word "Prime". Use the modulus operator, %, to determine if a number is prime
Example output:
Please enter a number larger than two: -939 Please enter a number larger than two: 2 Please enter a number larger than two: 20 2 Prime 3 Prime 5 Prime 7 Prime 11 Prime 13 Prime 17 Prime 19 Prime
This is what I have so far. I suppose i'm not really understanding how to continue with the second for loop. The first one just prints out a list of numbers from 2 to the number designated by the user. In my case that variable is user_input.
Code:
// Alen
// Prime
//
# include <iostream>
using namespace std;
[Code] ....
C :: Calculate Prime Numbers In Range And Return Count Of Prime Numbers
Apr 28, 2013I wrote a program which sends a starting and ending range to other processes and the processes calculate the prime numbers in that range and return the count of prime numbers to the head process, process 0. But this is not working properly at the moment. I realize I still have to split up the range based on how many processes I have...I still have not figured out how I want to set that up. I
Code:
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
int isPrime(int num);
int main(int argc, char **argv){
}
[code]....
C++ :: Prime Number Program Not Working With Odd Non-prime Numbers
Dec 2, 2014I have a program that gets prime numbers that doesn't work. It looks like it works for all prime numbers except odd non-prime ones. Here is the code:
Code:
#include <iostream>
using namespace std;
bool isPrime(int prime) {
while(true) {
int track = 0;
[Code] ...
C/C++ :: Finding All Prime Numbers To Nth Prime Number
Aug 24, 2014I'm a new coder for C++, and I've recently learned java before starting this programming language. I'm attempting to find all prime numbers up to the number a user enters (i.e. User enters 10, System shows "1,2,3,5,7"),
#include <iostream>
#include <cstdlib>
using namespace std;
int main(int argc, char** argv) {
int num;
cout << "Enter a positive number." << endl;
[Code] ....
I've been looking at my forloop, and I can't seem to pinpoint the problem with it.
Visual C++ :: Calculate Prime Numbers In Order
May 12, 2013So if i write a Loop to calculate Prime Numbers in order, is there any way possible for this to happen in a shorter period of time.
The loop that i constructed took about 11hrs on a Win 7 2GB ram machine to calculate about 150,000 primes, could this be done any faster................
C++ :: Calculate Angle Value In Form Of Trigonometric Functions - Loops And Void
Jul 24, 2013This is an assignment which the purpose is to calculate an angle value in form of trigonometric functions. These are the codes that I've wrote so far.
#include <iostream>
#include <cstdlib>
using namespace std;
void menu(double &value) {
system("cls");
cout<<"*****Trigonometry Program*****"<<endl;
[Code] ....
I have completed the codes for the interface part. Before I proceed with the formula for the trigonometric functions, I would like to make sure the program is Error-free, which if there is accidental invalid input from the user, the program would the user to enter another input until it is a valid response.
The only problem I have encountered for this matter was in menu(value)
If I enter an integer, the program will proceed without error. However, If I enter a character, the program will slip into an endless loop which constantly shows this
*****Trigonometry Program*****
Please enter an angle value => Is the angle in Degree or Radian?
Type D if it is in Degree
Type R if it is in Radian
Your response=> 0 //my initial input for value
Do you want to continue?
Type Y to continue
Type any other key to stop
Your response =>
Where is the source of the problem? I'm pretty sure it's the loop, but I don't know what to do.
Visual C++ :: Program To Calculate Sales Totals For A General Store - While Loops
Jan 25, 2013I need coding this project using while loops and cout/cin.. It is suppose to be one while loop for the whole thing and inside of the first while loop is the second while loop for each sale separately.
You have been asked to write a program to calculate sales totals for a general store. Your program will not know how many products each customer will buy, so your program will have to repeat the process until the last product has been entered (use -1 for Product ID to end each sale). After each sale your program must ask if you want to do another sale (Y - continue, N - end program).
At the beginning of the day, the cash drawer has $500 in it. At the end of the program you must display how much money is in the drawer after handling all your sales transactions.
Input
Your program must take the following input:
- Product ID Number (int)
- Quantity for each item purchased (int)
- Cash Received at the end of the sale
Use the following dataset to determine the price and taxability for each item.
First Sale:
Product ID Price Quantity Taxable
101 $65.00 2 Yes
102 $12.50 1 No
103 $24.50 5 No
104 $38.75 4 Yes
105 $17.80 6 Yes
106 $16.50 2 No
107 $42.85 8 Yes
108 $32.99 2 Yes
109 $28.75 1 Yes
110 $51.55 1 No
Second Sale:
Product ID Price Quantity Taxable
102 $12.50 1 No
103 $24.50 1 No
106 $16.50 1 No
107 $42.85 1 Yes
108 $32.99 1 Yes
109 $28.75 1 Yes
Third Sale:
Product ID Price Quantity Taxable
106 $16.50 4 No
107 $42.85 3 Yes
108 $32.99 1 Yes
109 $28.75 5 Yes
110 $51.55 2 No
Calculating Tax
For those items that are taxable, assume a 7.5% sales tax. Be sure to keep a running total of tax for the each sale.
Getting Started
You must use the starter file provided with this assignment.
What to turn in:
- A copy of your source code
- A printout of your program's output
C :: Program That Allow User To Enter A Number N And Print Nth Prime Number
Nov 3, 2013I need to write a program that will allow the user to enter a number "n" and the program tell you that the nth prime number is .....
EXAMPLE
user enters 55
printf("The 55th prime number is %i", variable");
C++ :: Receive Number From User And Output Largest Prime Number
Nov 20, 2014I am attempting to write code that receives a number from the user and outputs the largest prime number underneath the user's number. There are no errors in my code, but no matter what number is imputed, the program says the largest prime number is 1. I cannot find where the issue is in the code. Here is the code I wrote:
#include <cstdlib>
#include <iostream>
#include <cmath>
using namespace std;
bool isPrime(int num);//function prototype
[Code] ....
C++ :: Number Is Prime Or Not
Nov 7, 2013#include <iostream>
using namespace std;
int main() {
//input output
[code]....
its supposed to tell whether the inputted number is prime or not
C++ :: Prime Factors Of A Number?
Oct 22, 2013I have to create a program where I need to find the prime factors of a number and express it using exponents.
For example, for the number 1368 should output:
1368 = 2^3 * 3^2 * 19^1
This is my code:
void primeFact (int n){
int i;
int score = 0;
[Code].....
C++ :: Prime Number Factorization
Dec 9, 2013I am trying to factorize semi-prime numbers by using a brute force method and a square root method.The brute force method should start by multiplying all odd numbers between 1 and the semi-prime number. Meaning that 1 should multiply 3 then 5 then 7, etc. Then three should multiply 5 then 7 then 9 and so forth. The first number would never multiply a number equal to or less than itself.
bruteForce(int x){
f1 = 1;
f2 = f1 + 2;
while (f1 < x){
for (f2 = x; f2 <= x; f2-2){
[Code] ....
For my other algorithm, I want it to get the square root of the semi-prime and then start multiplying odd numbers around it. I made it so that the square root would have to be set to the next even number (in case it was a factor). If the product of the two odd numbers (a * b) is greater than the original semi-prime, I would multiply b by the next smaller number than a. Conversely, if the product of a and b is less than the original semi-prime, it will multiply a by the next odd number larger than b. This will repeat until the two correct factors of the original semi-prime are found.
Algorithm:
SquareRootFactorize(int x){
int N = x;
sqrtN = sqrt(N);
if (isOdd(sqrtN) == true)
sqrtN = sqrtN + 1;
f1 = sqrtN - 1;
f2 = sqrtN + 1;
[code].....
C++ :: Prime Number Between Two Values
Mar 14, 2014I wrote this program to print prime numbers between 2 and 10 but it only prints '3'. here is the code
#include<iostream>
#include<conio.h>
using namespace std;
int prime(int x, int y);
void main(){
int n=2;
[code].....
C/C++ :: MPI Prime Number Search?
Mar 14, 2015We are working on building a cluster and needed to create or find a program writen in C that we can run. I was thinking a program that finds prime numbers and insert them into a MySQL database. I have never worked with C so I don't know where to start or anything. I have a week to prove our project is worth keeping and our cluster is almost completely installed we just need to create a program.
View 4 Replies View RelatedC++ :: Finding If A Number Is Prime Or Not
Oct 3, 2013cin.ignore (10);
return 0;
}
Its not working
C/C++ :: Prime Number Counter?
Feb 23, 2014I have to write a program that asks the user to input a positive integer, counts how many primes there are before this integer, then divide the number of primes by the integer. Here's what I have so far:
int n;
int counter = 0;
cout<<"Enter a positive integer n.";
cin>>n;
[Code]....
the value of the integer counter is supposed to increase whenever a prime number is identified but it's increasing n times
C++ :: Finding If A Number Is Prime?
Oct 3, 2013We need it to say if the number is prime or not we need the equation for the if statement or if we have something else wrong to let me know.
#include <iostream>
using namespace std;
int main () {
int number;
bool countr;
for (countr = 0; countr <= 2; countr ++)
[Code] ....
C/C++ :: Test If A Number Is A Prime?
Mar 13, 2014my assignment is to print out the numbers from 2 to 20 stating if they are primes or not using loops and/or a function..once i execute, it throws the program into an infinite loop...
#include <iostream>
#include <cmath>
using namespace std;
bool prime(int n);
int main()
{
int i;
C++ :: Program That Loops X Number Of Times
Feb 20, 2015I'm trying to create a program that loops "x" number of times, where "x" is going to be a user-input number.
View 2 Replies View RelatedC++ :: Variable Initiation - Calculate Number Of Multiplications It Took To Reach A Certain Number
Feb 19, 2014So I have a template, part of a larger code, that is designed to calculate the number of multiplications it took to reach a certain number. The problem is, whenever I execute the program, mults is always printing out a strange number, perhaps its actual address.
template <class T>
T power3(T x, unsigned int n, unsigned int& mults) {
if (n == 0) return 1;
if (n == 1) return x;
if (n == 2){
[Code] ....
C++ :: Faster Prime Number Algorithm
Oct 19, 2014Can I possibly get a better implementation of a prime number detecting algorithm than the one I already have below?
Code:
#include <cstdio>
#include <cstdlib>
int main() {
int no, high, low;
int divisor;
[Code] .....
C :: How To Store The Highest Prime Number
Feb 17, 2013Basically, I am suppose to compute 10 numbers and find their highest prime number for each of them. I've already have the inputs working, and set up 2 arrays to store inputs and their highest prime number. But I am uncertain on how to find and store their highest prime number. How to start it off?
View 7 Replies View RelatedC++ :: Choose A Number To Check If Prime Or Not
Oct 20, 2014#include "stdafx.h"
#include "iostream"
using namespace std;
int main (){
int x;
int i;
int e;
[Code] ....
is the logic good ? and why the program is looping
C/C++ :: Finding Prime Factors Of A Number
Mar 18, 2015I am trying to find the prime factors of a number but when i compile and run my code after i enter a number it just closes it doesn't print ....
included library : [URL] ....
#include "std_lib_facilities.h";
void prime(int n) {
int result;
result = 0;
int i;
for (i = 2; i == n*n; ++i)
[Code] .....
C++ :: Show Prime Number Between A And B And Count Them
Dec 24, 2014This shows any prime number between a and b and also counts them*/
#include <iostream>
using namespace std;
int main(){
int a;
int b;
[Code] .....