SievePrime.cpp

#include<iostream>
using namespace std; 

#define MAX 100
#define nline "\n"

void primeSieve(int n){
    int prime[MAX] = {0};

    for(int i = 2;  i<=n;i++){
        if(prime[i] == 0){
            for(int j = i*i;j<=n;j += i){
                prime[j] = 1;
            }
        }
    }
    for(int i = 2; i<=n;i++){
        if(prime[i] == 0){
            cout<<i<<" ";
        }
    }
    cout<<nline;
}
int main(){
    int n;
    cin>>n;
    primeSieve(n);

    return 0;
}