#include?<math.h>
int?isprime(int?n)?{
int?i;
if?(n==2?||?n==3)?return?1;
if?(n%2==0)?return?0;
for?(i=3;i<=sqrt(n);i+=2)?{
if?(n%i==0)?return?0;
}
return?1;
}
int?main()?{
double?sum?=?0.0;
int?i;
for?(i=3;i<=100;i++)?{
if?(isprime(i))?{
sum?+=?sqrt(i);
}
}
printf("3-100，素數平方根之和：%f\n",?sum);
return?0;
}