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author | Nguyễn Gia Phong <vn.mcsinyx@gmail.com> | 2019-12-28 21:16:58 +0700 |
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committer | Nguyễn Gia Phong <vn.mcsinyx@gmail.com> | 2019-12-28 21:21:44 +0700 |
commit | 0887d8f96950a060a122e14ed2981182ff1eb37d (patch) | |
tree | 68be7a59c323c1fd901455ffae8f21874c4bb4c6 /usth/ICT2.1/labwork/3/stack.c | |
parent | e461df7573c2b7b7e26c965d8cf2d8e175d67378 (diff) | |
download | cp-0887d8f96950a060a122e14ed2981182ff1eb37d.tar.gz |
[usth/ICT2.1] Algorithm and Data Structures
Diffstat (limited to 'usth/ICT2.1/labwork/3/stack.c')
-rw-r--r-- | usth/ICT2.1/labwork/3/stack.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/usth/ICT2.1/labwork/3/stack.c b/usth/ICT2.1/labwork/3/stack.c new file mode 100644 index 0000000..708fb59 --- /dev/null +++ b/usth/ICT2.1/labwork/3/stack.c @@ -0,0 +1,39 @@ +/* + * Stack implemented using linked list. + * This is free and unencumbered software released into the public domain. + */ + +#include <stdlib.h> + +#include "stack.h" + +stack *mkstack() +{ + stack *s = malloc(sizeof(stack)); + s->stack = NULL; + return s; +} + +int stack_empty(stack *s) +{ + return s->stack == NULL; +} + +void stack_push(stack *s, void *item) +{ + s->stack = cons(item, s->stack); +} + +void *stack_top(stack *s) +{ + return car(s->stack); +} + +void *stack_pop(stack *s) +{ + void *first = car(s->stack); + construct *rest = cdr(s->stack); + free(s->stack); + s->stack = rest; + return first; +} |