题解 | #筛选法求素数#

#include <stdio.h>

int main() {
    int n, arr[100];
    while (scanf("%d", &n) != EOF) {
        int count = 0;
        for (int i = 2; i < n; i++) {
            arr[i] = i;
        }
        for (int i = 2; i < n; i++) {
            for (int j = i + 1; j < n; j++) {
                if (arr[j] != 0 && arr[j] % i == 0) {
                    arr[j] = 0;
                    count++;
                }
            }
        }
        for (int i = 2; i < n; i++) {
            if (arr[i] != 0) {
                printf("%d ", arr[i]);
            }
        }
        printf("\n%d\n", count + 1);
    }
    return 0;
}