C go to start of linked list in loop -

hi have linked list defined

struct process    {                  int a;                         struct process *next;      };  typedef struct process node; 

i have 2 nodes, 4 , 5 lets say.

i want loop goes through linked list , decrements each node 1 until 0.

any suggestions?

code have:

    {     if (arrivaltime->next == null)     {       // printf("a is: %d \n", arrivaltime->a);       printf("--       ");       break;     }     else     {       //  printf("a is: %d \n", arrivaltime->a);       printf("--       ");       arrivaltime->a--;       arrivaltime = arrivaltime->next;     }     //arrivaltime = start;  } while(1); 

i can loop run once.

arrivaltime = start; while(arrivaltime == null)  {       arrivaltime->a--;       printf("a is: %d \n", arrivaltime->a);       arrivaltime = arrivaltime->next;  }