Explain the sentence outlined, I haven t been able to understand it for a long time! Be detailed!

The first underlined explanation: Take an example of weightlessness and overweight: you stand on the diagonal escalator of a supermarket and the escalator starts suddenly, then you are overweight, and the actual acceleration at that moment is diagonally upward along the escalator.

In the same way, if the escalator stops suddenly, then the actual acceleration at that moment is diagonally downward.

The second line is explained: For example, if you jump from a height, you have a necklace around your neck that your mother gave you, and the rope is very light, and if its mass is negligible, let's only study the pendant. While you are in the air, the downward acceleration of the pendant is the same as your acceleration is g, and this state is specified as the pendant is completely weightless.

And you can also see that the pendant seems to be light and fluttering, and the rope is very loose, which can be said to mean that your neck can't feel the pull of the pendant, that is, the pull of the pendant on you is zero.

Is it easy to understand? Thank you

Overweight and weightlessness are only for the acceleration in the vertical direction, and have nothing to do with the acceleration in other directions, such as the bow and arrow shot, subject to the gravity pointing to the ground and the air resistance pointing at the shooter, the acceleration generated by gravity is g, the direction is downward, which is commonly known as gravitational acceleration, and the acceleration direction generated by the drag is directed towards the shooter and plays a hindering role.

Seek the level of painting without spraying.

2. Imagine taking an elevator, when you go upstairs, people are in a state of overweight, and when you go downstairs, you are weightless, the cable that pulls the elevator is broken, and the elevator has no support for you when you are completely weightless, and you are not pulling the elevator.

It's all about compilers and so on. This **will be compiled into different compilations**.

Let's test an output.

i=8;printf("%d,%d,%d,%d,%d",i++,i,i--,i--,i--)

You will find that there are 5 8s that are to say, i++, i--There is no value of image i after the operation, but ++i,--i will affect, I hope you will verify this sentence.

Then the order of operations in printf is from right to left. Then wait for the operation to finish and then output from left to right, and the order in which the program is executed is as follows:

printf("%d",-i--) Step 1 i was originally 8, - directly ignored later, -8 into the stack.

printf("%d",-i++) Step 2 i was originally 8, + is directly ignored at the back, -8 enters the stack.

printf("%d",i--) Step 3 i was originally 8,-Ignore it directly in the back, 8 into the stack.

printf("%d",i++) Step 4 i was originally 8, + is directly ignored in the back, 8 into the stack.

printf("%d",--i);Step 5 i would have been 8, - subtract 1 from the front and 7 into the stack.

printf("%d",++i);Step 6 i was originally 7, + add 1,8 in front of the stack.

When the screen prints, the stack is therefore 8 7 8 8 -8 -8

This is a very typical number of characters'0'to'9'to convert to the corresponding integer value. Due to the fact that in ASCII character encoding,'0'to'9'It is sequentially encoded (30h 39h, h for hexadecimal, 48d for decimal for 57d, d for decimal). Your program assumes that the string is a numeric string, and *p is'0'to'9', but *p is always a character, not an integer value, and to get its corresponding integer value, use *p-'0'。

c The compiler will put *p and'0'Convert to their corresponding integer encoding, and then subtract them to get the difference between the two characters in the ASCII encoding (also called the offset), which is the integer value corresponding to the *p character. Let's look at an example:

Suppose *p=='6'，*p-'0'And it became'6'-'0', which is converted into the corresponding ASCII code is 54D-48D, which is equal to 6D, which is the integer value of 6.

Also, your program has a problem: while(*p !.)= null) should be changed to.

while(*p != nul) or while(*p != '\0')

null is a null pointer, not a null character. The ASCII encoding of null characters is 0, the type is char, and the type of null pointer is void*

There's no point in dwelling on these grammatical things...

Use less plus and subtract (in the case of continuous use).

Just because a computer isn't confused doesn't mean programmers aren't confused.

First of all, it is necessary to understand what is the difference between ++ (or --) in front of ++i (--i) and ++ (or --) in front of i++ (i--);

Here we take ++i and i++ as examples (--the same way); And they are all expressions 1 and ++i, the expression of which first adds to i, and the expression is equal to the value of i after self-addition;

So if the initial attempt is i=8;

After running ++i, i=9 and the expression is equal to 9

2. After the expression i++, i is self-added, and the expression is equal to the value of i before self-addition;

So if the initial attempt is i=8;

After running ++i, i=9, the expression is equal to 8

secondly, printf prints the expression, which prints the final value of the expression, and it calculates the expression from back to front, and then prints the expression;

For the example of asking a question, with the above foundation, it is now explained as follows:

printf("%d%d%d%d%d%d",++i,--i,i++,i--,i++,i--)

6, ++i, post-run expression 8;

5、--i, post-run expression 7;

4. i++, post-run expression 8;

3. i--, expression 8 after running;

2, -i++, post-run expression -8;

1. -i--, post-run expression -8;

It's the compiler that compiles and analyzes the different, which causes you to have this problem.

1, the printf statement is executed from right to left, and the correct answer should be 8 7 7 -7 -8

Because the software you're using (which I personally think is a matter of priority) thinks -i-- is (-i)-- and that's what you're talking about.

2. Please use the specified software according to the exam syllabus.

My result is 8 7 7 8 -7 -8 (the compiler is dev-c++ and I have the same view as the second floor. Again, from the printf function into the stack order, firstly, the priority of ++ is higher than that of - (now it is divided into one level, but it is not).

The rightmost -i--i.e. -(i--) results in -8, and the value of i becomes 7-i++, i.e. -(i++) results in -7, i==8i-- and results in 8, i==7

i++ result 7, i==8

i results in i, i==7

i results in i, i==8

Just turn it upside down.

I can explain it very well on my side.

It should be: I like him like the feeling of wanting to scream like I liked in junior high school.

ps: I should want to express and like his feeling, just like the kind of like in junior high school, I like it so much that I want to scream. bar.

I guess so. What a strongman's sentence this is!

That is to say, the feelings for him are like when you like someone in junior high school, and you want to scream. Bang your heart out.

Isn't this kind of sentence similar to "look up at the sky at a 45° angle"?

needs to be reviewed, and the modifier should be europe'S leadership 2015 strategy for the industry, that is, strategy, the second half of the sentence can be divided into three main parts, to disscuss, "discuss", how europe'S leadership 2015 strategy for the industry needs to be reviewed, to face the new challenges the crisis brings,"to face the new challenges brought about by the crisis"。

The full sentence is translated as follows:

The European Commission has recently organized a high-level meeting to discuss how to implement the European Industry Leadership Strategy for 2015's leadership 2015 strategy for the industry) to face the new challenges brought about by the crisis.

++ No idea about you!

Analysis] 1. need to be reviewed is used to modify the strategy, not the industry (the industry is also to modify the strategy).

The whole sentence can be paraphrased: the industrial strategy needs to be reviewed

Looking at the whole frame sentence in general: the first half of the sentence is a whole sentence, starting from to discuss....The beginning is followed by an infinitive purpose adverbial clause to modify the first half of the sentence (without modification, the front can also be an independent sentence).

In the second half of the sentence, face is the predicate verb.

2. Whether the leadership is typed wrong, it should be lowercase, indicating "leadership ability".

o( o haha, enough can be it, adopt it!

The European Commission is the subject, has recently organised is the predicate, and A High-Level Meeting is the object. To discuss how Europe's leadership 2015 strategy needs to be reviewed is the adverbial of the purpose, and for the industry is the adverbial of the strategy. To face the new challenges the crisis brings is the purpose adverbial to be reviewed.

That's how this big sentence is structured.

The European Commission recently organized a high-level meeting to discuss how the LEADERSHIP 2015 strategy examines the needs of industry in order to face the new challenges posed by the crisis.

The European Commission has recently organized a high-level meeting to discuss how in 2015 the European leadership strategy to review the crisis posed by the new challenges facing the industry.

Abundance over and