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  1. //Cecilia Rangel	 CSC5	 Chapter 6,				 P.375, #21
  2. //
  3. /**************************************************************
  4.  *
  5.  * PRIME NUMBERS
  6.  * ____________________________________________________________
  7.  * This program will ask for the user to input a positive
  8.  * number, and the program determines if the number is a prime 
  9.  * number
  10.  * 
  11.  *_____________________________________________________________
  12.  * INPUT
  13.  *  	user input : a number to be evaluated
  14.  *
  15.  * OUTPUT
  16.  *		prime	   : determining whether or not user input 
  17.  *					is a prime number
  18.  *					
  19.  *
  20.  **************************************************************/
  21. #include <iostream>
  22. #include <cmath>
  23. #include <iomanip>
  24. using namespace std;
  25.  
  26. bool isPrime(int);	//prime function
  27.  
  28. int main() {
  29. 	int number;				
  30.  
  31.  
  32. 	cout << "Please enter a number and i will check if it is a prime." 
  33. 		 << endl;
  34. 	cin >> number;
  35.  
  36.  
  37. 	if (isPrime(number))
  38. 	{
  39. 		cout << number << " is a Prime number." << endl;
  40. 	}
  41. 	else
  42. 		cout << number << " is not a Prime number." << endl;
  43.  
  44. 	return 0;
  45. }
  46.  
  47. //**********************************************************
  48. // isPrime function definition. This function determines   *
  49. // whether or not the integer entered by the user is a     *
  50. // prime number or not.									   *
  51. //*********************************************************
  52. bool isPrime(int number)
  53. {
  54. 	for (int checker = 2; checker <= number; checker++)
  55. 	{
  56. 		if (number % checker == 0)
  57. 		{
  58. 			if(number == checker)
  59. 				return true;
  60. 			else
  61. 				return false;
  62. 		}
  63. 	}
  64. 	return false;
  65. }
Success #stdin #stdout 0s 5320KB
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10
stdout
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Please enter a number and i will check if it is a prime.
10 is not a Prime number.
https://ideone.com/1ebLyR
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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