C/stdlib.h/malloc

    
//Declaration: void *malloc(size_t size); 
//Return:      returns a pointer to the memory. 
               If there is insufficient memory, malloc() returns a null pointer. 
  
  #include<stdio.h>
  struct addr {
    char name[40];
    char street[40];
    char zip[10];
  };
  main()
  {
    struct addr *p;
    p = malloc(sizeof(struct addr));
    if(p==NULL) {
      printf("Allocation Error\n");
      exit(1);
    }
    return p;
  }