Question

Which of the following is the right syntax to copy n characters from the object pointed to by s2 into the object pointed to by s1?

(a) void *memcpy(void *s1,const void *s2,size_t n);

(b) void *memcpy(void  *s2, const void *s1, size_t n);

(c) void memcpy(void  *s1,const void *s2, size_t n);

(d) void memcpy(void *s2,const void *s1,size_t n);

This question was posed to me during an interview.

Query is from String Operations topic in section String Operations in C of C

Answer 1

The correct answer is (a) void *memcpy(void *s1,const void *s2,size_t n);

The explanation: The memcpy() function copies n characters from the object pointed to by s2 into the object pointed to by s1. If copying takes place between objects that overlap, the behavior is undefined.