素数间的距离

#include<iostream>
#include<cmath>
using namespace std;
bool isprime(int n)
{
for(int k=2;k<=sqrt((double)n);k++)

if((n%k)==0)
return false;
return true;
}
int main()
{
int n;
cin>>n;
while(n--)
{
int num,i,j;
cin>>num;
if(num==1)
{
cout<<"2 1"<<endl;
continue;
}
for(i=num;!isprime(i);i--);
for(j=num;!isprime(j);j++);
if((num-i)<(j-num))
cout<<i<<' '<<(num-i)<<endl;
else if((num-i)>(j-num))
cout<<j<<' '<<(j-num)<<endl;
else if((num-i)==(j-num))
cout<<i<<' '<<(num-i)<<endl;
}
}