我想从文本框中的内容中休息一个百分比 [英] i want to rest a percentage from the content in the textboxes

问题描述

嗨伙计们



i需要从两个文本框的答案中休息一个百分比，但我真的不知道怎么样，我这样做只是给我一个从家庭作业的方式错误，这就是我所做的路线; textBox3.Text = Convert.ToString（Convert.ToDouble（textBox1.Text）* Convert.ToDouble（textBox2.Text） - 13％）; 下划线中的部分给我一个无效的表达式术语，我希望你能提供帮助，谢谢你，祝你有愉快的一天！ ：D

hi guys

i need to rest a percentage from the answer of two textboxes but i realy don't know how, the way i do it just give me an error by the way its from a homework and this is the line i've made; textBox3.Text = Convert.ToString(Convert.ToDouble(textBox1.Text) * Convert.ToDouble(textBox2.Text) - 13%); the part in the underline is given me an invalid expression term, i hope you may help, thank you and have a nice day! :D

推荐答案

textBox3.Text = Convert.ToString(Convert.ToDouble(textBox1.Text) * Convert.ToDouble(textBox2.Text) - 13%);

问题是你使用13％，因为它是一个数字，这不是！

当你谈论百分比它总是一定比例的东西，所以你必须看看你想要计算这个百分比的数字......

如果你有一个数字 a 你得到这个数字的13％，比如

The problem is that you use 13% as it was a number, which is not!
When you talking about percentage it is always a percentage of something, so you have to see from what number you want to compute that percentage...
Like if you have a number a you get 13% of that number like

(a/100)*13

这将为您提供13％的 a ...

因此，请检查您的作业，看看您应该做些什么...

That will gives you the 13% of a...
So review your assignment and see what you should do...

％是模运算符 [ ^ ]在c＃中与百分比无关。

所以你要么减去13或者0.13但是如果你需要在结尾添加一个％符号，你应该使用String.Format，或者在将它转换为字符串后添加％字符。

% is the modulo operator[^] in c# and has nothing to do with percentage.
So you either substract 13 or 0.13 but if you need to add a % sign at the end, you should use String.Format, or simply add "%" character after converting it to string.

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