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已知|a|=5，|b|=7，且|a+b|=a+b，则a-b的值为______．
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∵|a|=5，|b|=7，∴a=5或-5，b=7或-7，又∵|a+b|=a+b，∴a+b≥0，∴a=5或-5，b=7，∴a-b=5-7=-2，或a-b=-5-7=-12．故答案为：-2或-12．
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其他类似问题
根据绝对值的性质求出a、b的值，然后代入进行计算即可求解．
本题考点：
考点点评：
本题考查了绝对值的性质，正数的绝对值等于它本身，负数的绝对值等于它的相反数，0的绝对值是0，本题判断出a+b≥0是关键，也是容易出错的地方．
扫描下载二维码c# - Readability a=b=c or a=c; b=c;? - Stack Overflow
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I have a class which has a group of integers, say
Now the question is for the best readbility, the init() function for foo(), should it look like
void init()
a=b=c=d=1; //for some reason they are init to 1;
s = "abc";
void init()
s = "abc";
The reason for a string in class is a hint of other groups of same types might present and of course, the class might grow as requirement changes
EDIT: before this question goes too far, the intention of this question was simple:
In Effective C++ item 12 (prefer initialization to assignment in constructors), Scott uses chain assignment instead of a=c; b=c; I am sure he knows when to use what, but I also remembered the books I read also reco which in similar case of assignments. In my program I have a similar situation of a group of related individual build-in types needs to be initialized and I have found by making a chain assignment does makes it easier to read especially if the class have many other different types instance variables. It seems to contradict with books I read and my memory, hence the question.
1,49041637
My personal preference is a=b=c=d for the following reasons:
It is concise, saves lines
It conveys the concept that (a/b/c/d) are initialized to the same thing, that they are related
However, caveat:
Don't do that if a/b/c/d are not related (and just happens to be initialized to 1).
You'll reduce the readability of your code.
// Foo-function related
// Bar-function related
Chaining assignments like this reduces the flexibility for you in the future to assign different initial values to the variables -- because then you'll have to break them up again.
Nevertheless, my personal recommendation is to chain assignments on variables that are related on concept/usage.
In actual practice, the need to change an assignment usually doesn't come up often so caveat #2 should not typically pose a problem.
Edit: My recommendation may go against published guidelines.
See the comments.
13.1k12344
I happen to prefer the chained version, but it's completely a matter of preference.
Please note, however, that
a = b = c = 0;
is equivalent to:
(not that it should matter to you which assignment happens first)
225k26287530
I guess it is a matter of opinion which is most readable.
(Clearly so ... otherwise you wouldn't be asking.)
However Oracle's
clearly says to use separate assignment statements:
10.4 Variable Assignments. "Avoid assigning several variables to the same value in a single statement. It is hard to read."
My opinion?
Follow your project's prescribed / agreed style rules, even if you don't like them1.
If your project doesn't (yet) have prescribed / agreed style rules:
Try to persuade the other members to adopt the most widely used applicable style rules.
If you can't persuade them / come to a consensus, then just do this informally for the major chunks of code that you write for the project1.
1 ... or get out.
472k64512861
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