题解 | #筛选法求素数#

#include <stdio.h>

int main() {
    int n = 0;
    while (scanf("%d", &n) != EOF) {
        int arr[101];
        int i = 0;
        //存储数据
        for (i = 2; i <= n; i++) {
            arr[i] = i;
        }
        int j = 0;
        for (j = 2; j <= n; j++) {
            int k = 0;
            for (k = j + 1; k <= n; k++) {
                if (arr[k] % j == 0) {
                    arr[k] = 0;
                }
            }
        }
        int count = 0;
        for (i = 2; i <= n; i++) {
            if (arr[i] != 0)
                printf("%d ", arr[i]);
            else
                count++;
        }
        printf("\n%d\n", count);
    }
    return 0;
}