0
1
2
3
4
5
6
7
8
9

--------------
10*0
9*2
8*4
7*6

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1×1=1
2×1=2 2×2=4
3×1=3 3×2=6 3×3=9
4×1=4 4×2=8 4×3=12 4×4=16
5×1=5 5×2=10 5×3=15 5×4=20 5×5=25
6×1=6 6×2=12 6×3=18 6×4=24 6×5=30 6×6=36
7×1=7 7×2=14 7×3=21 7×4=28 7×5=35 7×6=42 7×7=49
8×1=8 8×2=16 8×3=24 8×4=32 8×5=40 8×6=48 8×7=56 8×8=64
9×1=9 9×2=18 9×3=27 9×4=36 9×5=45 9×6=54 9×7=63 9×8=72 9×9=81

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do…while()
先执行一遍语句,再判断是否执行循环
10

--------------
*
**
***
****
*****

--------------
         *
        ***
       *****
      *******
     *********
    ***********
   *************
  ***************
 *****************
*******************

--------------
                             *
                           *    *
                         *        *
                       *            *
                     *                *
                   *                    *
                 *                        *
               *                            *
             *                                *
           *                                    *
         *                                        *
       *                                            *
     *                                                *
   *                                                    *
   *  *  *  *  *  *  *  *  *  *  *  *  *  *  *