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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef int Elem;
  5.  
  6. typedef struct stack {
  7.   Elem e;
  8.   struct stack *next;
  9. } Stack;
  10.  
  11. Elem pop(Stack **s) {
  12.     if (*s==NULL) exit(EXIT_FAILURE);
  13.     Stack* help = *s;
  14.     Elem e = help->e;
  15.     *s = (*s)->next;
  16.     free(help);
  17.     return e;
  18. }
  19.  
  20. void push(Stack **ss, Elem elem) {
  21.    Stack *help;
  22.  
  23.    help = malloc(sizeof(Stack));
  24.    help->e = elem;
  25.    help->next = *ss;
  26.    *ss = help;
  27. }
  28.  
  29. int main()
  30. {
  31.     	Stack *s = NULL;
  32.         push(&s, 10);
  33.         push(&s, 12);
  34.  
  35.         printf("%d\n", pop(&s));
  36.         printf("%d\n", pop(&s));
  37.  
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 1852KB
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Standard input is empty
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12
10
https://ideone.com/ZrlbD
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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