Achilles's Blog

#include int main(){    using namespace std;    int hand[4] = {1,2,3,4};    int things[] = {1,5,3,8};    int i, num = sizeof(things) / sizeof(int);    cout     cout     cout

Quoted from the >:Arguments are the initializers for a function's parameters. The first argument initializes the first parameter, the second argument initializes the second parameter, and so on. Alt

Automatic ObjectsThe objects that correspond to ordinary local variables are created when the function's control path passes through the variable's defintion. They are destroyed when control passes

Quote from the Books: On the other hand, the dereference operator is an example of an expression for which decltype returns a reference. As we've seen, when we dereference a pointer, we get the obje

C++ primer introduce some functions of try block.. But it haven't a instance..So I get the first example.#include #include #include using namespace std;int main(){ float num1, num2, resu

The overloaded function is an important concept in C++.What's the definition?Function that have the same name but different parameter lists and that appear in the same scope are overloaded. Genera

Pointer to the function?It appears on the page.247. I had never get in touch with this concept before. Let me make some records.A function pointer is just that -- a pointer that denotes a function

Remark it ~Today, i register a new account in stackoverflow.The csdn is nice as the stackoverflow.That's enought for me, a  beginner in program

Today, I found a puzzle of "decltype definition"... it's relative to the reference...example:#include int main(){const int ci = 0, &cj = ci;decltype(ci) x = 0;decltype(ci) y = x;std::cou

Today,  I start learning the class in C++.. It's really hard to get it.So slow my step into it...I decided to make some records at first.The books mention a simple class on Page 73:struct Sales_da

cbegin(cend):Return const_iterator to beginningReturns a const_iterator pointing to the first element in the container.A const_iterator is an iterator that points to const content. This iter

Quote from the >:"""int *p = &ia[2]; // ia[] is a int-type array, it contains  5 elements.int j = p[1];int k = p[-2];This last example points out an imiportant difference between arrays an

It's quoted from the >"""....typedef double Money;string bal;class Account {public: Money balance() { return bal; }private: Money bal;//.....};When the compiler sees the decl

"""ADVICE: USE CONSTRUCTOR INITIALIZERS-------------------------------------------------------------------------------------------------------------------------------------------------------------

"""Classes control object initialization by defining one or more special member functions known as contstructors. The job of a constructor is to initialize the data members of a class object. A cons

The is an answer (not the only one) for exercise 5.4.1:Remark it for my own path for program path#include #include using namespace std;int main(){ vector sVect; vector iVec; unsigned i

A constant expression is an expression whose value cannot change and that can be evaluated at compile time.A typical characteristic: the constant express will be evaluated at compile time, not at ru

Today, i met a problem.. I'm a new man in C++ programer.So it's reserved for me... I believe I would get it.#include using nameapce std;int main(){string str;auto sp = str.begin(); /// st

#include #include int main(){    using namespace std;    char charr1[20];    char charr2[20] = "jaguar";    string str1;    string str2 = "panther";    cout     cin >> charr1;

//strtype3.cpp .. more string class features#include #include #include           // C-styple string libraryint main(){    using namespace std;    char charr1[20];    char charr2[20]

It's important to make a distinction between:1. "Pointer" as a variable residing on the stack. The name tempb refers to one such variable.2. "Pointer" as an integer value that refers to a memory l

#include int main(){    using namespace std;    int yam[3];    yam[0] = 7;    yam[1] = 8;    // why it can't report the warnning? when yam[3] is existed?    yam[3] = 6;            //

If you are n't cookie, please skip it ... Thanksfrom now on, I get two methods or ways to use it:cin.get(name,ArSize).get()cin.get(ch);It's really confuse me right now.  I Know C language, the

Okay. Today i get a new concept about pointer:I usually treat pointer as a tag of address. But now I think i made some mistakes.First of all: when a pointer  point to the the first of address

It's shown on the C++ prime plus:You would see it if you follow the step ..I just want make a record, it takes me some times... On page: 301The excercise:Write a program that reads inp

size_t cnt = 0;for (auto &row: ia) for (auto &col : row) { col = cnt; ++cnt;}In the previous example ,we used frefernces as our loop control variables because we wanted to change

C++ Keywords:alignascontinuefriendregistertruealignofdecltypegotoreinterpret_casttryasmdefaultifreturntypedefautodeleteinlineshorttypeid

The result of applying sizeof depends in part on the type involved:*) sizeof char or an expression of type char is guaranteed to be 1.*) sizeof a reference type returns the size of an object of th

#include int me = 42;int me2 = 42;int main(){std::cout << me << std::endl;me = 33;std::cout << me << std::endl;std::cout << ::me << std::endl;int me2 = 33;std::cout << me2 << std::endl;

What's the difference between the references and pointer?the common:they are used for indirect access to other objects.the differences:1.) a pointer is an object in itw own right. Pointers can

reinterpret_cast:Allows any pointer to be converted into any other pointer type. Also allows any integral type to be converted into any pointer type and vice versa.form: reinterpret_cast ( ex

Every C++ expression is either an lvalue or an rvalue. An lvalue refers to an object that persists beyond a single expression. You can think of an lvalue as an object that has a name. All variables, i

"""To support separate compilation, c++ distinguishes between declarations and definitions. A declaration makes a name known to the program. A file that wants to use a name defined elsewhere include