【C】#箭形图案#

#include <stdio.h>

int main() {
    int n;
    while (scanf("%d", &n) != EOF) {
        for (int i = 0; i <= n; i++) {
            for (int j = 0; j <= n; j++) {
                if (j < n - i)
                    printf("  ");
                else
                    printf("*");
            }
            printf("\n");
        }
        for (int i = 0; i < n; i++) {
            for (int j = n + 1; j > 0; j--) {
                if (j > n - i)
                    printf("  ");
                else
                    printf("*");
            }
            printf("\n");
        }
    }
    return 0;
}