#include <iostream>
using namespace std;
int main()
{
int isprim(int x);
void printprim(int low,int high);
printprim(2,100);
return 0;
}
int isprim(int x)
{
int i;
if(x%2==0)
return 0;
else
{
for(i=2;i<=x/2;i++)
{
if(x%i==0)
break;
}
if(i>x/2)
return 1;
else return 0;
}
}
void printprim(int low,int high)
{
if(low%2==0)
low++;
if(high%2==0)
high--;
int i;
for(i=low;i<=high-2;i=i+2)
{
if(isprim(i)&&isprim(i+2))
cout<<i<<" "<<i+2<<endl;
}
}
追问这个是二级水平吗?怎么感觉好高级····