#include <iostream>//hetao3097453
using namespace std;
int main()
{
    int n;
    cin >> n;
    for(int i = 1;i <= n;i++)
    {
        if((i % 10 == 1 || i % 10 == 3) || (i % 10 == 5 || i % 10 == 7))
        {
            cout << i << endl;
        }
    }
    return 0;
}

半夜打卡第6题

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    for (int i = 1; i <= n; i += 2) if (i % 10 != 9) cout << i << endl;
    return 0;
}

AC,放心食用👀️

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    for (int i = 1; i <= n; i += 2)if (i % 10 != 9) cout << i << "\n";
}