Test careful point in using pointer and dereferencing it to value type in C. Merit point is to use pointer and be careful when working with deref value variable.

ptr.c

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

struct myStr
{
  int valuea;
  int valueb;
};
typedef struct myStr myStr;

int main (int argc, char* args[])
{
  myStr* a = malloc(sizeof(myStr));
  myStr v = *a;
  v.valuea = 10;
  v.valueb = 20;
  printf("pointer a\n");
  printf("valuea: %d\n", a->valuea);
  printf("valueb: %d\n", a->valueb);

  printf("v\n");
  printf("valuea: %d\n", v.valuea);
  printf("valueb: %d\n", v.valueb);
  free(a);
  return 0;
}