具有可选参数的C#递归函数
作者:互联网
我在递归函数上遇到可选参数问题
这是一个示例代码:
private static void RecursiveFunction(int x, int optional = 0)
{
if (x < 5)
RecursiveFunction(x + 1, optional++);
}
调用函数时:
RecursiveFunction(0);
我得到了以下结果(只需在即时窗口中调用此代码string.Format(“{0} – {1}”,x,可选):
"0 - 0"
"1 - 0"
"2 - 0"
"3 - 0"
"4 - 0"
我在这里错过了什么吗?谢谢!
解决方法:
改变自:
RecursiveFunction(x + 1, optional++);
// ^^
至:
RecursiveFunction(x + 1, ++optional);
// ^^
第一个执行操作然后增加可选.
第二个在增加可选项后执行操作.
从MSDN开始:
++ var
var ++
The first form is a prefix increment operation. The result of the
operation is the value of the operand after it has been incremented.The second form is a postfix increment operation. The result of the
operation is the value of the operand before it has been incremented.
标签:c,recursion,net-4-0,optional-parameters 来源: https://codeday.me/bug/20190713/1450534.html