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  1.  #include <iostream>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     int n, i;
  7.     bool prime = true;
  8.  
  9.     cout << "Enter a number: ";
  10.     cin >> n;
  11.  
  12.     if (n <= 1)
  13.         prime = false;
  14.     else
  15.     {
  16.         for (i = 2; i < n; i++)
  17.         {
  18.             if (n % i == 0)
  19.             {
  20.                 prime = false;
  21.                 break;
  22.             }
  23.         }
  24.     }
  25.  
  26.     if (prime)
  27.         cout << n << " is a prime number.";
  28.     else
  29.         cout << n << " is not a prime number.";
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5268KB
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stdin
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5
stdout
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Enter a number: 5 is a prime number.
https://ideone.com/0kVtKO
language:
C++ (gcc 8.3)
created:
8 hours ago
visibility:
public

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