istack.h

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#ifndef GUARD_ISTACK
#define GUARD_ISTACK
 
typedef struct _istack {
    int val;
    struct _istack* next;
} istack_el;
 
typedef istack_el* istack_ptr;
 
istack_ptr istack_new();
 
int istack_empty(istack_ptr istack);
 
int istack_push(istack_ptr istack, int val);
 
 
int istack_pop(istack_ptr istack);
 
int istack_top(istack_ptr istack, int def);
 
void istack_free(istack_ptr istack);
 
#endif