[英]Python mathematical expression evaluation
我试图解决一个随机问题,我使用了我建立的关系,当我在 python 中实现它时,它给我的结果与我计算的结果不同,所以我试图改变。
问题是我不明白 python 如何看到每个?!?
rows, columns = 4, 4
for row in range(2, rows+1):
for column in range(1, columns+1):
print('*'*15)
result = ((column+1)//2) * ((row+1)//2)
f_result = (column+1)//2 * (row+1)//2
print('>> normal expression:', (column+1)//2, (row+1)//2)
print('>> second expression:', ((column+1)//2), ((row+1)//2))
print('>> row:', row)
print('>> column:', column)
print('>> Results:', result, f_result)
print()
您需要先了解运算符优先级查看此链接
对于表达式
((col+1)//2) * ((row+1)//2) = (col+1)//2 * (row+1)//2
((col+1)//2) * ((row+1)//2) = ((4+1)//2) * ((4+1)//2)
= (5//2)*(5//2)
= 2 * 2
= 4
(col+1)//2 * (row+1)//2 = (4+1)//2 * (4+1)//2
= 5//2 * 5//2
= 2 * 5//2
= 10//2 (as * has higher precedence than //)
= 5
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