织梦网网站建设视频下载/seo词库排行

先说核心要点：

1. /是精确除法，//是向下取整除法，%是求模
2. %求模是基于向下取整除法规则的
3. 四舍五入取整round, 向零取整int, 向下和向上取整函数math.floor, math.ceil
4. //和math.floor在CPython中的不同
5. C中%是向零取整求模。

下面按顺序介绍：

1. 一个测试程序和它的输出

print('1). usage of /')
print ('10/4 = ', 10/4)
print ('-10/4 = ', -10/4)
print ('10/-4 = ', 10/-4)
print ('-10/-4 = ', -10/-4)print('\n2). usage of //')
print ('10//4 = ', 10//4)
print ('-10//4 = ', -10//4)
print ('10//-4 = ', 10//-4)
print ('-10//-4 = ', -10//-4)print('\n3). usage of %')
print ('10%4 = ', 10%4)
print ('-10%4 = ', -10%4)
print ('10%-4 = ', 10%-4)
print ('-10%-4 = ', -10%-4)

输出结果如下：

1). usage of /
10/4 =  2.5
-10/4 =  -2.5
10/-4 =  -2.5
-10/-4 =  2.52). usage of //
10//4 =  2
-10//4 =  -3
10//-4 =  -3
-10//-4 =  23). usage of %
10%4 =  2
-10%4 =  -2
10%-4 =  -2
-10%-4 =  2