malloc(); and free();

This is a discussion on malloc(); and free(); within the C Programming forums, part of the General Programming Boards category; What do malloc(); and free(); do? What are they used for? Could somebody please show me an example? Also, what ...

  1. #1
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    malloc(); and free();

    What do malloc(); and free(); do?

    What are they used for? Could somebody please show me an example?

    Also, what header files do i include to use these functions?

    I use MSVC++ 6!

    Cya.

  2. #2
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    malloc is used for dynamic memory allocation, free is used to free the memory allocated by malloc (or calloc, realloc)

    read the manual pages for more information

    example:
    Code:
    #include <stdio.h>
    #include <stdlib.h> /* needed for malloc, free */
    
    int main(void)
    {
       char *msg;
    
       msg = malloc(13); /* allocate memory (13 bytes) */
       if(msg == NULL)
          return -1;
    
       strcpy(msg, "Hello world!");
       printf("%s\n", msg);
       free(msg);
       return 0;
    }

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