Dynamic Memory Allocation in C

dynamic_memory_location.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
      /* ====================================================================== */
      /*  Dynamic Memory Allocation */
      /* ====================================================================== */
      char *str = NULL;

      /* Initial memory allocation */
      str = (char*)malloc(4 * sizeof(char));
      strcpy(str, "joe");
      printf("String = %s, Address = %u\n", str, str);

      /* Reallocating memory */
      str = (char*)realloc(str, 4 * sizeof(char));
      strcat(str, ".com");
      printf("String = %s, Address = %u\n", str, str);

      free(str);
      
      
    char *msg = NULL;
    int limit = 0;

    printf("Enter the limit:");
    scanf("%d", &limit);


    msg = (char *)malloc(limit * sizeof(char));
    if (!msg)
    {
      return -1;
    }

    printf("Enter the string:");
    scanf(" ");
    gets(msg);


    printf("result = %s\n", msg);
    free(msg);
      return 0;
}