structure

问题 This question already has an answer here : Fortran derived types containing pointers to be accessible from C (1 answer) Closed 2 years ago . I have a structured type in Fortran that contains lots of data including pointers (real*8 pointer data type). I am developing a C++ API for some Fortran routine. I need the contents of the structure to persist between calls to the Fortran routine. I was thinking about getting the address of the structure using loc and pass the address to the C++ side.

问题 This question already has answers here : int a[] = {1,2,}; Weird comma allowed. Any particular reason? (19 answers) Closed 6 years ago . While browsing through some codes, i came across this method of initialization: #include<stdio.h> struct trial{ int x, y; }; int main(){ int a[10] = {0,1, };//comma here struct trial z = {1, };//comma here return 0; } What is the significance of this comma operator? I do not find any difference in the method of initialization if the comma operator is removed

问题 When I'm trying to create a folder structure in my Resources folder, Eclipse messes it up. For example I have an image stored in /Resources/Graphics/SomeFolder/example.gif In the Package/Project Explorer I have then an empty package Graphics and a different package called Graphics.SomeFolder . Now I can't load the image when I try to access is with the normal path. For clarification I created this folder structure \Resources\graphics\images\subfolder\image.gif and this is what Eclipse makes

问题 I have a structure like struct board{ char name; int values[37]; }board Imagine a game where there are several players playing at a single table and they all make different bets on different positions of the values array.The name of the board is unique and a player enters a game specifying the board name. If 2 or more players enter the same board name they all join the same game. I need to put this structure into shared memory and access/modify the contents of "values" from different

问题 as a beginner, I have formulated some ideas, but wanted to ask the community about the best way to implement the following program: It decodes 8 different types of data file. They are all different, but most are similar (contain a lot of similar fields). In addition, there are 3 generations of system which can generate these files. Each is slightly different, but generates the same types of files. I need to make a visual app which can read in any one of these, plot the data in a table (using

问题 I'm trying to create a method that will import a structure assuming that all structure elements are flat and the same data type. Then I want to convert it to a table with that type dynamically and return it. Where should I start? I've been trying to get this to work for several hours and am getting nowhere. 回答1: You can use the create_dynamic_table form using cl_alv_table_create like so: * Create dynamic internal table and assign to FS CALL METHOD cl_alv_table_create=>create_dynamic_table

问题 I've created a structure of 10 elements (11th for sentinel value) and a structure pointer, assigning address of first structure element to it. struct student { int roll_no; }; struct student s[11]; struct student *ptr = &s[0]; s[10] = NULL; // Sentinel value while (*ptr != NULL ) // Sentinel Controlled Loop { printf ("%d - ", ptr -> roll_no); ptr++; } How do I provide a sentinel value in the end of a structure array ? EDIT : values in structure are changing dynamically i.e. i've created space

问题 struct node{ int data; struct node * next; }; How does the compiler allocate memory for "next" member in when we have not yet allocated memory for the structure "struct node" 回答1: next member is a pointer - a variable that will contain an address of node , not node itself. All data type pointers are usually of the same size so it's enough for the compiler to know that it's a pointer to be able to compute its size. 回答2: The member next is a pointer. Pointers are all the same size, so the

问题 I have started reading the Lions Commentary on Unix v6. I came across these snippets, which I have never seen used in the C language. The author does provide some sort of an explanation, but could someone explain to me what is happening here? params.h : SW 0177570 ...... struct { int integ; }; and this used in unix/prf.c if(SW->integ == 0) Explanation by the author SW is defined previously as the value 0177570. This is the kernel address of a read only processor register which stores the

问题 I'm trying to understand how structs work within SWIFT. I'm familiar with how .NET handles them and how it packs bytes into a structure, etc. I'm finding some weirdness with the following code: struct exampleStruct { var ModelNumber: Byte! var MajorVersion: Byte! var MinorVersion: Byte! var Revision: Byte! } var myStruct = exampleStruct ( ModelNumber: 1, MajorVersion: 2, MinorVersion: 3, Revision: 4 ) myStruct.MinorVersion // << Returns 3 // Struct to NSData. var data = NSData( bytes: