题解 | #箭形图案#

int main()

{

int a, b, n;
int i;

while (scanf("%d", &n) != EOF)

{

for (i = 0 ; i <= n; i++)
{
    
    for (a = 0; a < 2 * (n-i); a++)
    {
        printf(" ");
    }
    
    for (b = 0; b < i+1; b++)
    {
        printf("*");
    }
    printf("\n");
}

for (i = 0 ; i < n ; i++)
{
    for (a = 0; a < 2*i + 2 ; a++)
    {
        printf(" ");
    }
    for (b = 0; b < n - i; b++)
    {
        printf("*");
    }
    printf("\n");
}
}
return 0;

}