交换2个变量

Posted 2020-10-31 smalllv

 1 a = 3
  2 b = 4
  3 
  4 #a,b交换让a = 4,b = 3.
  5 
  6 #第一种
  7 
  8 #c = 0
  9 #c = a
 10 #a = b
 11 #b = c
 12 
 13 
 14 
 15 #第二种
 16 #a = a+b
 17 #b = a-b
 18 #a = a-b
 19 
 20 
 21 #第三种
 22 
 23 #a,b = b,a