"Entertainment to" the secret of the C + + language cannot be said

Everyone loves C + +, isn't it?

C + + has a rich template library, such as<map><stack><queue><ext\pb_ds\priority_queue.hpp> Really loved Ah, but who knows, in the innermost heart of C, but also hidden those who can not say the secret.

SECRET _1 (array magic, regular array with a mad heart)

Let's look at a few lines of code like this

1  for (int i=1; i<=n;i++)   scanf ("%d",&a[i]); 2  for (int i=1; i<=n;i++)   printf ("", A[i]);

Comfortable, huh? This is the cow. ), that's all for today, thank you all (go back and say)

// input 1 2 3 4 5 // the output 1 2 3 4 5

This you do not understand the excuse, as a (Blablabla) ... We should get to the chase quickly.

We also have a code, as follows.

 for (int i=1; i<=n;i++)   printf ("", I[a]);

// the output 1 2 3 4 5

Oh, my God! Is there something wrong with my compiler?

In fact, this involves the manipulation of array pointers.

In code Snippet 1, there is

printf ("%d", A[i])// actually array a[] can also be seen as a int* typea//  The operation at this time is equivalent to printf ("%d", (A+i));

So, no, just say it? = = "i[a]== (i+a) = = (a+i) ==a[i];

secret_2 (the symbol of terror tends to be)

(Horror Story atmosphere) Yet many years ago, there was a symbol of horror! His name tends to be, about his record, probably like this.

He has a common face: "<--" This is the great demon!

He's probably been used in this way.

1    Cin>>N; 2     while (0<--N) {3        cout<<n<<""; 4    }

We have

// input 5 // Output 4 3 2 1

Powerful, huh?

It is said that he has a brother who is fast tending to

1    Cin>>N; 2     while (0<----N) {3        cout<<n<<""; 4    }

And a strong father, accelerating toward

1    Cin>>N; 2     while (0<------N) {3        cout<<n<<""; 4    }

There is also a fabulous uncle, the speed of light tends to

1    Cin>>N; 2     while (0<----------N) {3        cout<<n<<""; 4    }

The ambition of their generation was to become a swift force (speed FORCE,DC Comics,flash) tended to

   Cin>>N;     while (0<--------------------------------------------------N) {       cout<<n<< " " ;   }

Haha said so much of the original people are I cheated!

The first usage tending to "<--" is equivalent to:

   Cin>>N;   N--;     while (n>0) {       cout<<n<<"";        --N;   } // haha, are you cheated? 

Secret_3 (bugs present in the compiler)

We have the code:

int n=3cout<<"sizeof (n) ="<<sizeof(n+ +) <<"\ n"<<n;

It turned out not.

4

5

But

4

4

Why is it?

It's strange.

Edit until 2015.5.30->19:19

"Entertainment to" the secret of the C + + language cannot be said