# help me

• October 21st, 2012, 04:45 PM
dovip
help me
I don't know what should I doing. About cmath. Here

Code:

#include <iostream> #include <cmath> using namespace std; int main() {     int n;     int i;     int is_prime = true;         cout << "Enter a number and press Enter: ";     cin >> n;         i = 2;     while (i <= sqrt(n)) {         if (n % i == 0)             is_prime = false;         i++;     }         if (is_prime)         cout << "Number is prime." << endl;     else         cout << "Number is not prime." << endl;             system("pause");     return 0; }
Please fix it for me. Thanks
• October 21st, 2012, 05:02 PM
dovip
Re: help me
I mean, Number 15 is error. It is said that C:\Users\Duy N. Le\Desktop\C++\prime1.cpp
call of overloaded sqrt(int&)' is ambiguous
• October 21st, 2012, 05:23 PM
GCDEF
Re: help me
Check the documentation for sqrt and see what type of argument it expects. Compare that to what you're passing it.
• October 24th, 2012, 08:52 PM
jbarrera03
Re: help me
Do you have to use the sqrt() function?
Here's a code I did a while ago, it lists prime numbers from a given range.
It can be modified to just tell if a number is prime.
Hope it Helps
Code:

// Prime Number Notes 10-7-2011.cpp : main project file. #include "stdafx.h" #include <iostream> #include "resource.h" using namespace std; void DisplayEvens(int, int); int main() {         // Declare and init two intergers         // Beginning num and ending numbers         int intBeginNum = 0;         int intEndNum = 0;         // Prompt user for range         cout << "Enter a beginning number for the range:" << endl;         cin >> intBeginNum;         cout << "Enter an ending number for the range:" << endl;         cin >> intEndNum;         DisplayEvens(intBeginNum, intEndNum);     system ("pause");         return 0; } void DisplayEvens(int intBeginNumDE, int intEndNumDE) {         // Initialization and declare         // this is done inside of for loop                 bool bolPrime = false;         for (int i = intBeginNumDE; i <= intEndNumDE; i++)         {                                 for (int j = 2; j < 10; j++)                 {                         if (i != j && i != 1)                                                {                                 if (i % j != 0)                                         bolPrime = true;                                 else                                 {                                         bolPrime = false;                                         break;                                 }                         }                 }                 if (bolPrime)                         cout << "Prime Number: " << i << endl;         }         return; }
• October 24th, 2012, 09:12 PM
dovip
Re: help me
Never mine. I already problem solved because I found out it. Show it here.

Code:

(i <= sqrt((double)n))`
It would worked. :-)
• October 24th, 2012, 09:35 PM
jbarrera03
Re: help me
Alright kool.