check prime number c 2b 2b

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showing results for - "check prime number c 2b 2b"
Laura
18 Oct 2016
1#include <iostream>
2using namespace std;
3
4int main()
5{
6  int n, i;
7  bool isPrime = true;
8
9  cout << "Enter a positive integer: ";
10  cin >> n;
11
12  for(i = 2; i <= n / 2; ++i)
13  {
14      if(n % i == 0)
15      {
16          isPrime = false;
17          break;
18      }
19  }
20  if (isPrime)
21      cout << "This is a prime number";
22  else
23      cout << "This is not a prime number";
24
25  return 0;
26}
Nick
04 Feb 2018
1#include <iostream>
2using namespace std;
3
4int main() {
5    int i, n;
6    bool isPrime = true;
7
8    cout << "Enter a positive integer: ";
9    cin >> n;
10
11    // 0 and 1 are not prime numbers
12    if (n == 0 || n == 1) {
13        isPrime = false;
14    }
15    else {
16        for (i = 2; i <= n / 2; ++i) {
17            if (n % i == 0) {
18                isPrime = false;
19                break;
20            }
21        }
22    }
23    if (isPrime)
24        cout << n << " is a prime number";
25    else
26        cout << n << " is not a prime number";
27
28    return 0;
29}
30
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