void *memcpy(void *dest，const void *src，size _ t n)；

Need header file

# include & ltstring.h & gt# include & ltmemory.h & gt

The specific usage is as follows:

int a[ 10]；

int b[ 10]；

memcpy(a，b， 10 * sizeof(int))； //Assign the contents of array B with the length of 10*sizeof(int) to A..

I forgot to mention that the destination array cannot be smaller than the length to be copied, otherwise it will cause memory access errors or other unpredictable errors.