Cod sursa(job #1469313)

Utilizator marius7Vlad Marius marius7 Data 8 august 2015 00:21:24
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <iostream>
#include<fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int prim(long x)
{long i;
    for(i=2;i*i<=x;i++)
        if(x%i==0)
        return 0;
    return 1;
}
int main()
{long n,i,nr=0;
fin>>n;
for(i=2;i<=n;i++)
    if(prim(i)==1)
        nr++;
    fout<<nr;
    return 0;
}