关于基本语法和问题的问题优先级C＃ [英] Question about basic syntax & precedence C#

问题描述

我是c的新手＃我工作表中的一个问题是：



会打印什么？

控制台。 WriteLine（35％4 * 3 + 2.3 - 6/4 * 3 +2）;



现在通常这是8.8但控制台说这是10.3。我试过用不同的优先级计算几种其他方法进行试验，但我从来没有得到10.3 - 我得到的最接近的结果是10.8。



可以任何人张贴一步一步说明控制台如何读取此行以及它如何达到10.3的结果？



我尝试过：



计算它在纸上同时改变我更高优先级的修补，没有达到与控制台相同的结果

hi i am new to c# one of the questions in my worksheet was this:

What will be printed?
Console.WriteLine(35 % 4 * 3 + 2.3 - 6/4 *3 +2);

Now normally this would be 8.8 but the console says it is 10.3. I've tried experimenting by calculating with a different precedence several other ways, but I never end up with 10.3 - the closest result i reached was 10.8.

can anyone post a step-by-step of how the console reads this line and how it reaches the result of 10.3?

What I have tried:

calculating it on paper while changing tinkering with what i put higher precedence on, didn't reach same result as console

推荐答案

Quote：

将要打印什么？

What will be printed?

Console.WriteLine(35 % 4 * 3 + 2.3 - 6/4 *3 +2);

相当简单，优先级先说乘法，除法和模数，然后加上离子和减法。

Rather simple, the precedence say multiplications, divisions and modulo first, then additions and subtractions.

35 % 4 * 3 + 2.3 - 6/4 * 3 + 2
// gives
((35 % 4) * 3) + 2.3 - ((6/4) * 3) + 2
(3 * 3) + 2.3 - (1 * 3) + 2
9 + 2.3 - 3 + 2
10.3

唯一的技巧是在C中，带整数的除法是一个带整数结果的整数除法。

The only trick is that in C, a division with integers is an integer division with an integer result.

你怎么会得到别的东西？ ：D



试试这个：



（（35％4）* 3）+ 2.3 - （（6/4）* 3）+ 2



请记住 6 / 4 使用整数完成，因此它产生 1 而不是 1.5 。

How would you get anything else? :D

Try this:

( ( 35 % 4 ) * 3 ) + 2.3 - ( ( 6 / 4 ) * 3 ) + 2

Bear in mind that 6 / 4 is done using integers, so it yields 1 rather than 1.5 .

你可以调整公式范围以强制按某种顺序发生事情，但你的例子中数学运算的顺序是：



0）root和exponents

1）乘法和除法

2）加法和减法



范围（使用括号对表达式的部分进行分组）可以覆盖括号外的正常优先级。

You could scope the formula to force things to happen in a certain order, but the order of math operations in your example would be:

0) roots and exponents
1) multiplication and division
2) addition and subtraction

Scoping (using parenthesis to group parts of the expression), can override the normal precedence that exists outside the parenthesis.

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