python while 循環打印九九乘法表
方向一
i = 1
while i <= 9:
j = 1
while j <= i
print(‘%d*%d = %2d‘%( j,i ,i*j),end=‘‘)
j += 1
print()
i += 1
思路：先寫出列，從一到九，再寫出列，每次行=列的時候換行，行數增加一，所以裏面的while循環是 j <= i,當行數小於列數時，執行換行代碼，進行下一輪的循環，end = ‘’ 表示不換行繼續往下寫
方向一打印結果示例
1*1 = 1
1*2 = 2 2*2 = 4
1*3 = 3 2*3 = 6 3*3 = 9
1*4 = 4 2*4 = 8 3*4 =12 4*4 =16
1*5 = 5 2*5 =10 3*5 =15 4*5 =20 5*5 =25
1*6 = 6 2*6 =12 3*6 =18 4*6 =24 5*6 =30 6*6 =36
1*7 = 7 2*7 =14 3*7 =21 4*7 =28 5*7 =35 6*7 =42 7*7 =49
1*8 = 8 2*8 =16 3*8 =24 4*8 =32 5*8 =40 6*8 =48 7*8 =56 8*8 =64
1*9 = 9 2*9 =18 3*9 =27 4*9 =36 5*9 =45 6*9 =54 7*9 =63 8*9 =72 9*9 =81
方向二
i = 1
while i <= 9:
k = 1
while k <= 9 - i:
print(‘ ‘,end = ‘ ‘)
k += 1
j = 1
while j <= i
print(‘%d*%d = %2d‘%( j,i ,i*j),end=‘‘)
j += 1
print()
i += 1
思路：方向二相對於方向一，需要在前面打印空格，且每次打印的空格跟行數有關，這時就需要一個循環，使得前面的空格被打印出來
方向一打印結果示例
1*1 = 1
1*2 = 2 2*2 = 4
1*3 = 3 2*3 = 6 3*3 = 9
1*4 = 4 2*4 = 8 3*4 =12 4*4 =16
1*5 = 5 2*5 =10 3*5 =15 4*5 =20 5*5 =25
1*6 = 6 2*6 =12 3*6 =18 4*6 =24 5*6 =30 6*6 =36
1*7 = 7 2*7 =14 3*7 =21 4*7 =28 5*7 =35 6*7 =42 7*7 =49
1*8 = 8 2*8 =16 3*8 =24 4*8 =32 5*8 =40 6*8 =48 7*8 =56 8*8 =64
1*9 = 9 2*9 =18 3*9 =27 4*9 =36 5*9 =45 6*9 =54 7*9 =63 8*9 =72 9*9 =81
方向三
i = 9
while i >= 1:
j = 1
while j <= i
print(‘%d*%d = %2d‘%( j,i ,i*j),end=‘‘)
j += 1
print()
i -= 1
思路：方向三中的i是從9到1，然後再是把i一個一個往下減
方向三打印結果示例
1*9 = 9 2*9 =18 3*9 =27 4*9 =36 5*9 =45 6*9 =54 7*9 =63 8*9 =72 9*9 =81
1*8 = 8 2*8 =16 3*8 =24 4*8 =32 5*8 =40 6*8 =48 7*8 =56 8*8 =64
1*7 = 7 2*7 =14 3*7 =21 4*7 =28 5*7 =35 6*7 =42 7*7 =49
1*6 = 6 2*6 =12 3*6 =18 4*6 =24 5*6 =30 6*6 =36
1*5 = 5 2*5 =10 3*5 =15 4*5 =20 5*5 =25
1*4 = 4 2*4 = 8 3*4 =12 4*4 =16
1*3 = 3 2*3 = 6 3*3 = 9
1*2 = 2 2*2 = 4
1*1 = 1
方向四
i = 9
while i >= 1:
k = 1
while k <= 9-i:
print(‘ ‘, end = ‘ ‘)
k += 1
j = 1
while j <= i
print(‘%d*%d = %2d‘%( j,i ,i*j),end=‘‘)
j += 1
print()
i -= 1
思路：和方向二類似，在方向三的基礎上，在前面根據行數打印一定量的空格就可以了
方向四打印結果示例
1*9 = 9 2*9 =18 3*9 =27 4*9 =36 5*9 =45 6*9 =54 7*9 =63 8*9 =72 9*9 =81
1*8 = 8 2*8 =16 3*8 =24 4*8 =32 5*8 =40 6*8 =48 7*8 =56 8*8 =64
1*7 = 7 2*7 =14 3*7 =21 4*7 =28 5*7 =35 6*7 =42 7*7 =49
1*6 = 6 2*6 =12 3*6 =18 4*6 =24 5*6 =30 6*6 =36
1*5 = 5 2*5 =10 3*5 =15 4*5 =20 5*5 =25
1*4 = 4 2*4 = 8 3*4 =12 4*4 =16
1*3 = 3 2*3 = 6 3*3 = 9
1*2 = 2 2*2 = 4
1*1 = 1
python while 循環打印九九乘法表