the book says, "if short is smaller than int, then using short can save memory."
do not understand "if short is smaller than int"
CPP stipulates that short at least 16 bits int is at least as long as short
so when will short be larger than int?
means that different compilers may differ in details
short will not be larger than int
the same compilation environment, and it is true that the short type will not be greater than int
if in all systems, the width of each type is the same, it will be very convenient to use, for example, short is always 16-bit, int is always 32-bit, and so on; but life is not that simple, your CPP code may run on different terminals, such as 32-bit machines, 64-bit machines, or even run on ancient single-chip microcontrollers, etc., the word length of CPU is different in these different environments.
attached reference article: those details of CPP-- differences between 32-bit and 64-bit data types
so in order to adapt to different hardware environments as much as possible, CPP provides a flexible standard to make your code more portable:
because it is the standard of CPP, as long as you are using a compiler that conforms to the CPP specification, it is inevitable that short saves more memory than int.
each person starts the game with a different Rank (a total of 14 Rank) and selects two people to answer the question pk,. How to design this algorithm? suppose that after I click to start the game, I send my request to enter a game to the server, and ...
unsigned char CPM 1; -1 is a constant stored according to the int type. C is printed directly. The last byte of the complement mode of-1 is copied directly to c. Is the equal sign of c language copied directly bit by bit? When you assign a constant to ...
binary tree preorder traversal ** * Definition for a binary tree node. * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * }; * ** * Return an array of size *returnSize. * Note: The returned arr...
pairs of positive integers (xpeny), the remainder of xrecery y is greater than or equal to k, the input is nmemery k, and the output is how many, for example, input 52, output 7, logarithms are (2magin3) (2magin4) (2mem5) (3pyrr5) (4preline 5) (5pc5), t...
for example, if there are two Boolean variables amenb, respectively, when b=true returns acentrology false, it returns! a, how to implement it with simple operation? how should I write a xxx b xxx? is actually a question of how to: true true f...
-sharpinclude <iostream> using namespace std; class Box { public: double getVolume(void) { return length * breadth * height; } void setLength(double len) { length = len; } void setBreadth(double bre) ...
1. Compile the function template program to find the maximum of the two data; 2. The source code is as follows: test.cpp -sharpinclude <iostream> using namespace std; template <class T> T max(T m1, T m2) {return (m1 > m2)? m1:m2;} in...
downloaded the btcpool source code, want to run on ubuntu16.04, but compiled ~! is there really a problem with the source code? Has anyone ever encountered this problem? who has the experience of successfully compiling btcpool source code? PPPPPP...
^ _ [Amurz] {2jue 10} $ is there a problem with this regular expression? see that no one writes that on the Internet. [Amurz] is all of [a-zA-Z]....
A json string variable is { "a": 1, "b": 2 } wants to escape as the json string { "a ": 1, "b ", 2}. is a variable, so there is no way to use R "() ". The json library uses jsoncpp is there any good way? ...
in practice, we encountered the use of vector < string > as a local variable to temporarily store a large number of string, and found that a large amount of memory was not released after running. After taking a look at the related problems, it is general...
the title is as follows: the robot walks the maze the maze consists of N W S E stepping on N, stepping on N, stepping on W, walking on the left, stepping on S, stepping on E, and stepping on E, input the number of rows in the maze is not greater than...
void exec_produce(int duration) { duration this_thread::sleep_for(chrono::seconds(duration)); this_thread::get_id()id cout << "exec_produce thread " << this_thread::get_id() << " has sleeped &q...
I want to implement a function of regular reconnection after a failed database connection, but I don t know why there is a memory leak, so I d like to ask the gods. to make it easier to ask questions, I tidied up the code, connected to the database d...
for example, dynamic link libraries (.lib .so files) are not introduced into the program at all when dynamically linked. So why do we need to give the path to the dynamic link library when we compile dynamically? ...
the following is the program source code: class base{ private: int x; public: void setx(int a) {x = a;} int getx() {return x;} }; int main(){ int * p; base a; a.setx(55); p = new int(a.getx()); cout ...
now the question is how do I add the selection effect and does the VUE scaffolding used by the selected items have a big idea? Personally, I feel that there is something wrong with this data. It can t be realized at all. ...
< H2 > 1. Run the test program run_simulator < H2 > after compiling the btcpool source code, run its test program cd work btcpool build run_simulator . simulator -c simulator.cfg -l log_simulator this program does not live in hang, so it is "finis...
at present, there is a function in a high-performance module in the project, which needs to be saved in cache all the time. A large number of other non-high-performance operations may be called during the execution of this function. The test result with...
I see a structure on boost.DI that I haven t seen before. What does the method in this structure mean? struct width { int value; constexpr operator int() const { return value; } }; struct height { int value; constexpr operator int() const { re...