Description

Please use the provided two files, main.c and function.h, to implement a stack. Includes following functions:

1. Push: insert an element into a stack.
2. Pop: remove the last element from a stack.
3. Peek the last element: print the last element’s value inside a stack.
4. Check if it is empty: Check if a stack is empty.

Note:

1. A Stack data structure shold follow LIFO(last in first out) rule.
2. Print nothing if there is no elements.

Go download function.c, and only need to submit function.c.

Input

Legal commands:

1. “push” with an integer N in a new line: Insert an element which value is N into the stack.
2. “pop”: remove the last element inside the stack and return its pointer.
3. “top”: print the last element inside the stack.
4. “isempty?”: Check if the stack is empty.

Output

No need to handle output. Please use function.c above.

Sample Input  Download

Sample Output  Download

Partial Judge Code

12943.c

Partial Judge Header

12943.h

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