Memcpy in c interview questions. This is declared in “string. The logic for your memcpy is correct and your interviewer didn't ask you to change it or add a restriction. void * memcpy ( void * destination, const void * source, size_t num ); When you pass in mainbuf, you are passing the same destination address each time. h” header file in C language. One is source and another is destination pointed by the pointer. It also has the requirement that the destination region can't overlap with the source region. Explore usage, practical examples, and safer alternatives for memory operations. Assuming you want to support this kind of memcpy as well - it is a bug. Unlike strcpy (), which is for strings, memcpy () works with any data type and doesn't stop at a null character. Perhaps you'd be interested in the difference between memcpy and memmove. tza gywhnift trfvvg edbhhr zgq rbuyknr rycwn lxf vik ngqxhg