Stuff

#include <iostream>#include <math.h>using namespace std;bool isprime(int num, int i, int (&primes)[79000]){  for(int j=0;primes[j]<int(sqrt(num)+1);j++)  {    if(int(num%primes[j]) == 0)    {      return(true);    }  }    return(false);}//---------------------------------------int main(){  int prime = 1;  double sum =2;  int i=0;  int primes[79000];  primes[0] = 2;  while(prime < 999998)  {    prime+=2;    i++;         while(isprime(prime,i,primes) && prime < 1000000)    {      prime+=2;    }    if(prime > 1000000)    {      break;    }           primes[i] = prime;    sum+= prime;  }  cout.setf(ios::fixed,ios::floatfield);  cout<<sum<<endl;  return(0);}