vb.net 如何减少小数点后的数字？
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how i can reduce the digits after the decimal point?
提问by sangeen
I need only up to two decimal points.
我只需要最多两个小数点。
Dim v1, v2, v3, v4, v5, tv, rp1, rp2, rp3, rp4, rp5 As Double
Dim v1, v2, v3, v4, v5, tv, rp1, rp2, rp3, rp4, rp5 As Double
Dim Per1, Per2, Per3, Per4, per5 As Double
Dim Per1, Per2, Per3, Per4, per5 As Double
Per1 = v1 / tv * 100
Per2 = v2 / tv * 100
Per3 = v3 / tv * 100
Per4 = v4 / tv * 100
per5 = v5 / tv * 100
It gives me values like per1=76.34393939202
它给了我像 per1=76.34393939202 这样的值
But if I use : Dim Per1, Per2, Per3, Per4, per5 As ULong It gives me 76
但是如果我使用： Dim Per1, Per2, Per3, Per4, per5 As ULong 它给了我 76
I want that it to gives me values like 76.34 but how i can do it? Please help me.
我希望它给我像 76.34 这样的值，但我该怎么做？请帮我。
回答by david
If you convert a Double to ULong it will remove all decimal places. If the problem is when you print them to screen, then you can simply use a string formatter:
如果您将 Double 转换为 ULong，它将删除所有小数位。如果问题出在将它们打印到屏幕时，那么您可以简单地使用字符串格式化程序：
Format(Per1, "0.00")
Documentation can be found here http://msdn.microsoft.com/en-us/library/microsoft.visualbasic.strings.format.aspx
文档可以在这里找到http://msdn.microsoft.com/en-us/library/microsoft.visualbasic.strings.format.aspx
If you want to round the numbers you can use
如果你想四舍五入你可以使用的数字
Math.Round(Per1, 2)
Round is documented here http://msdn.microsoft.com/en-us/library/75ks3aby.aspx
回合记录在这里http://msdn.microsoft.com/en-us/library/75ks3aby.aspx
Hope this helps
希望这可以帮助
回答by mbeso
in c# it looks like this
在 c# 中它看起来像这样
string.Format("{0:0.00}", (double)Convert.ToInt32(tv) * 100 / Convert.ToInt32(v1))
