Programmer Think

The first small project after learning C + + refers to some good codes on the Internet. A and a in any binary system are regarded as a number, so the highest 36 binary system, but it is also easy to change this small place to 10 + 26 + 26 binary system. Firstly, the addition and subtraction of decimal long integers are realized. Since they are ...

STL learning notes (I) string c_str() const char *c_str(); c_ The str() function returns a pointer to the normal C string, with the same content as this string string s="123" printf("%s",s.c_str()) Add: insert() iterator insert( iterator i, const char &ch ); basic_string &insert( size_type index, const basic_string & ...

Dark horse programmer's ingenuity | C + + tutorial starts programming from 0 to 1. Learning programming is no longer difficult 1. C + + Beginner 1.1 the first c + + program #include <iostream> using namespace std; int main() { cout << "hello" << endl; system("pause"); return 0; } result: hello 1.2 notes Singl ...

Jinjin's pocket money has always been managed by itself. At the beginning of each month, my mother gives Jinjin 300 yuan. Jinjin will budget the expenses of this month, and always achieve the same actual expenses as the budget. In order to let Jinjin learn how to save, her mother proposed that Jinjin could deposit 100% of her money at any time, ...

1. Concepts ComboBox is a combination of buttons and pop-up lists. It provides a way to display a list of options to the user, which takes up the least screen space. ComboBox is populated with data models. Data models are usually JavaScript arrays, ListModel s, or integers, but they also support other types of data models. ComboBox { x:200 ...

Transferred from: https://www.cnblogs.com/yingying0907/archive/2012/07/31/2616975.html 1. Heap memory allocation: C/C + + defines four memory intervals: Code area, global variable and static variable area, local variable area, i.e. stack area, and dynamic storage area, i.e. heap area or free store area. Concept of heap: A variable (or object) ...

Link, data structure - stack and queue (2) stack Data structure - stack and queue (II) stack data structure Stack and queue (II) queue Mind map 3.2.1 basic concept of queue 1. Concept A Queue is a linear table that can only be inserted at one end and deleted at the other end Queue is a special linear structure. It only allows de ...

1, Pointer 1.1 difference between pointer variable and ordinary variable Pointer: the essence of pointer is a variable. It has no essential difference from ordinary variables. Pointer integrity should be called pointer variable, referred to as pointer. It means pointing. The pointer itself is an object, and the pointer does not need to be ...

1, Create workspace 1. Create a new folder Create a new catkin_ws folder and create src subdirectory in it. mkdir -p ~/dev/catkin_ws/src cd ~/dev/catkin_ws/src 2. Initialize workspace In the src subdirectory just created, use the following command to create a workspace, but there is no function package in the workspace at this time, onl ...

Chapter 4 expressions 4.1 Foundation 4.1.1 basic concepts Function call is also a special operator, which has no limit on the number of operands. (1) Left and right values Simple induction: when an object is used as an R-value, the value (content) of the object is used; When an object is used as an lvalue, the identity (location in me ...