题解 | #牛牛的字符菱形#

int main()
{
    char c = 0;
    scanf("%c", &c);

    int i = 0, j = 0, r = 0;
    int n = 2;
    int m = 1;
    
    //避免第二次循环n m的值被改变
    int a = n;
    int b = m;

    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < a; j++)
        {
            printf(" ");
        }
        a--;
        for (r = 0; r < b; r++)
        {
            printf("%c", c);
        }
        b = b + 2;
        printf("\n");
    }

    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < m; j++)
        {
            printf(" ");
        }
        m++;
        for (r = 0; r < n + 1; r++)
        {
            printf("%c", c);
        }
        n = n - 2;
        printf("\n");
    }
    return 0;
}