Writing memcpy memory copy Function c ++ code example and running result (Code tutorial), memcpy writing

Writing memcpy memory copy Function c ++ code example and running result (Code tutorial), memcpy writing

Memcpy () is a memory copy function. Compared with strcpy, memcpy can only copy strings. memcpy can copy any type of data.

The following code uses c ++ to write a function with the same functions as the memcpy () function.

C ++ code

# Include <iostream> # include <assert. h> using namespace std; void * memCpy (char * dst, char * src, size_t size) {assert (dst! = NULL & src! = NULL); char * Dst = dst; // prevents changes to the dst address char * Src = src; while (size --> 0) * Dst ++ = * Src ++; return dst;} int main () {char src [] = "hello world"; char dst [20]; memCpy (dst, src, 11 ); cout <"Source string is" <src <endl; cout <"Copied string is" <dst <endl; return 0 ;}

Running result