1.在屏幕上输出以下图案：

      *

     ***

    *****

   *******

  *********

 ***********

*************

 ***********

  *********

   *******

    *****

     ***

      *

#include <stdio.h>

int main()

{

    int line = 0;

    for (line = 0; line < 7; line++)

    {

        int j = 2 * line + 1;

        for (; j >= 1; j--)

        {

            int w = 6 - line;

            for (; w >= 1; w--)

                printf_s(" ");

            for (; j >= 1; j--)

            {

                printf_s("*");

                if (j == 1)

                    printf("\n");

            }

        }

    }

    for (line = 5; line >=0; line--)

    {

        int j = 2 * line + 1;

        for (; j >= 1; j--)

        {

            int w = 6 - line;

            for (; w >= 1; w--)

                printf_s(" ");

            for (; j >= 1; j--)

            {

                printf_s("*");

                if (j == 1)

                    printf("\n");

            }

        }

    }

    return 0;

}