c - Program crashes on line t->time = t0; -

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i usiung mingw c programing environment, found serious problem. test code follows:

#include <time.h> #include <stdlib.h> #include <stdio.h>  typedef struct {        /* time struct */     time_t time;        /* time (s) expressed standard time_t */     double sec;         /* fraction of second under 1 s */ } gtime_t;  typedef struct {            gtime_t time;             int type;          } raw_t;  int main(){     raw_t *t;     gtime_t t0={0};     t->time = t0;     printf ("%d",(t->time).time);      return 0; }

i defined 2 struct , 1 struct contained in other one. when run test program, crush on line

t->time = t0;

can me on this?

t pointer has not been initialized. can't dereferenced assign value member. can either initialize heap

t = malloc(sizeof(raw_t));

or initialize stack 

raw_t tonthestack; raw_t *t = &tonthestack;

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