use malloc to apply for space in a function in a C language project. Finally, the function returns the value saved in this space, that is, there is no space requested by free in the function, so do you need free outside the function?
char *test() { char *op = malloc(sizeof(char) * 16); ... return op; } int main() { printf("%s", test()); }
needs to be released manually
malloc and free need to be used in pairs, otherwise it is easy to cause memory leak
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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 ...
-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) ...
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...
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? ...
hello world cpp ...
encounter item.Selected conversion problem when revamping website add "$ " such as < option selected= "selected " value= "$6$ " > red < option > < option value= "$3$ " > black < option > < option value= "$5$ " > blue < option > < option ...
at first I found that it was a bug, that appeared in a low version of gcc. When I upgraded gcc, it could be compiled under the command line, but it failed in clion. How to adjust it in clion. -sharpinclude <iostream> void print() { } template ...
CPP11 allows list initialization for all objects, and because the constructor body is assigned, references and const variables must be initialized first, so you must use list initialization, so how is it initialized before CPP11? ...
< H1 > question < H1 > centos version 7 , NVIDIA graphics card Tesla P4 , previously installed cuda version 8 , running normally. but after installing cuda9 , restart cannot enter the graphical interface, as shown below: the cuda inst...
int Setbit(int* A,int RowSize){ int i = 0;int Sum = 0; for(i = 0;i < RowSize;iPP) if(A[i] == 0) Sum ^= 1<<(RowSize-i-1); return Sum; } Setbit; bool Readbit(int S,int i,int RowSize){ return S&( 1 << (R...
topic: ss for example: enter google, to find that the longest symmetrical string is goog enter abcda to find that the longest symmetric string is aba. if there is more than one longest symmetric string, multiple longest symmetric strings o...
error message We do not provide support for this pre-release version. You may encounter build failures or other breakages. = > Installing dependencies for tmux: pkg-config, makedepend, Libevent = > Installing tmux dependency: pkg-config = > Downloa...
when learning < random > library, only seed_seq does not quite understand although I went to MSDN, and cppreference, it is not very clear that there is too little information about seed_seq on Google. my understanding is: when a given seed is not ve...
Why not provide semaphores directly in RT,CPP11? Instead, it can be implemented jointly with mutexes and conditional variables, for what consideration? ...
1. Under folder A, there is a folder B 2. Generate static libraries in folder B, assuming that the ld.a, source code is written in C 3. The .CPP file in folder A, a function that references the source code in folder B, and links to the static library ...
Update gcc, with brew under < H2 > mac there are a lot of header files that can t be used! < H2 > as the title for example, write a helloworld 1 -sharpinclude <stdio.h> 2 -sharpinclude <stdlib.h> 3 int main(){ 4 printf(&quo...
I have an one-dimensional array, which contains the letter Amurz. If you want to find out all the unique combinations, the combination type is 1-to-many, for example: the letter A can be combined with any other one or more letters, please give a Demo or...
for example, if I have a function in the c file that I want to export and open to others to call, how can I automatically generate these function declarations into the .h header file? ...
< H1 > question < H1 > I want to compile it with make. The header file uses iconv.h , but cygwin already has libiconv installed . ...
is currently getting started learning about FFmpeg. When introducing SDL threads, there are the following problems: 1. Create demux_ thread in main thread 2. demux_thread 3. main 4. Complete code ffplay.c -sharpinclude <stdio.h> -sha...