混合操作数类型左操作数的类型决定了行为

加法

"4" + 2         # Gives "42"
4 + "2"         # Gives 6
1,2,3 + "Hello" # Gives 1,2,3,"Hello"
"Hello" + 1,2,3 # Gives "Hello1 2 3"

对于乘法

"3" * 2   # Gives "33"
2 * "3"   # Gives 6
1,2,3 * 2 # Gives 1,2,3,1,2,3
2 * 1,2,3 # Gives an error op_Multiply is missing

影响可能会对比较运算符产生隐患：

$a = Read-Host "Enter a number"
Enter a number : 33
$a -gt 5
False