用函数判断输入的数是否是素数

   1:  #include "stdafx.h"

   2:  #include "iostream"

   3:  using namespace std;

   4:  int isprime(int n)

   5:  {

   6:      int i;

   7:      for(i=2;i<n^(1/2);i++)

   8:          if(n%i==0)

   9:              return 0;

  10:      return 1;

  11:  }

  12:  void main()

  13:  {

  14:      int n;

  15:      cin >> n;

  16:      if(isprime(n))

  17:          cout << n <<"是素数!"<<endl;

  18:      else

  19:          cout << n<<"不是素数!"<<endl;

  20:      cin >> n;

  21:  }