3i Infotech Placement: Sample Questions 503 - 503 of 1245
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Question 503
Explanation
- memcpy ()
- Copies bytes of data between memory blocks- called buffers.
- doesn՚t care about the type of data being copied.
- Simply makes an exact byte-for byte copy.
- The function declaration is
- void ⚹ memcpy (void ⚹ dest, void ⚹ src, size_t count) ;
- Arguments dest and src point to the destination and source memory blocks.
- Count specifies the number of bytes to be copied.
- Memmove ()
- Copies a specified number of bytes from one memory block to another.
- More flexible, as it can handle overlapping memory blocks- can do everything memcpy () can with flexibility of dealing with overlapping blocks.
- The function declaration is
- Void ⚹ memmove (void ⚹ dest, void ⚹ src, size_t count) ;
- Dest and src point to destination and source memory blocks
- Count specifies the number of bytes to copied.
- The return value is in dest.
- Memset ()
- To set all the bytes in a block of memory to a particular value, use memset ()
- memset () initializes a block of memory to a specified value.
- Void ⚹ memset (void ⚹ dest, int c, size_t count) ;
- Dest points to the block of memory.
- C is of type int but treated as a type char-, only the low-order byte is used, and we specify values of c only in the range 0 through 255.
- Function useful only with type char- useful for blocks of data types other than char only when they are to be initialized to 0.