int stack_is_full(stack *s){ return(s->count>=s->size-1 ? -1:0); }
时间: 2024-05-28 17:13:24 浏览: 7
这是一个判断栈是否已满的函数,其返回值为int类型。其中,stack是一个结构体类型的指针,包含了栈的大小(size)和当前元素个数(count)等信息。
函数体中的三目运算符?:表示如果栈元素个数(count)已经达到了栈的大小(size)减1,即栈已满,那么返回-1;否则返回0,表示栈未满。
需要注意的是,这里的栈元素个数(count)是从0开始计数的,因此当栈元素个数(count)等于栈的大小(size)时,栈已满。
相关问题
假设从键盘输入一整数的序列:a1, a2, a3,…,an,试编写算法实现:用栈结构存储输入的整数,当ai≠-1时,将ai进栈;当ai=-1时,输出栈顶整数并出栈。算法要对非正常情况(例如入栈满等)给出相应的报错信息及处理
1. 初始化一个空栈stack,和一个计数器count=0。
2. 从键盘输入整数序列,依次取出每个整数ai,进行以下判断:
- 如果ai不等于-1,则将其进栈,并将count加1。
- 如果ai等于-1,则判断栈是否为空,若为空,则输出错误信息并退出程序;否则,弹出栈顶元素并输出,同时将count减1。
- 如果输入的整数数量超过了设定的最大值,即count大于等于设定的最大值,那么输出错误信息并退出程序。
3. 若整个序列输入结束后,栈不为空,则依次弹出栈顶元素并输出,直至栈为空。
4. 程序结束。
以下是示例代码实现(以输入5个整数为例,可根据需要修改):
```python
class Stack:
def __init__(self, capacity):
self.capacity = capacity # 栈的容量
self.items = [] # 栈的存储
self.top = -1 # 栈顶指针
def is_empty(self):
return self.top == -1
def is_full(self):
return self.top == self.capacity - 1
def push(self, item):
if self.is_full():
print("Error: Stack is full.")
return False
else:
self.top += 1
self.items.append(item)
return True
def pop(self):
if self.is_empty():
print("Error: Stack is empty.")
return None
else:
self.top -= 1
return self.items.pop()
def main():
capacity = 5 # 栈的容量
stack = Stack(capacity)
count = 0 # 计数器
for i in range(capacity):
ai = int(input("请输入第%d个整数:" % (i + 1)))
if ai != -1:
if stack.push(ai): # 入栈成功
count += 1
else:
if stack.is_empty(): # 栈为空
print("Error: Stack is empty.")
break
else:
item = stack.pop() # 弹出栈顶元素
print("弹出的整数为:%d" % item)
count -= 1
if count >= capacity: # 栈已满
print("Error: Stack is full.")
break
# 若整个序列输入结束后,栈不为空,则依次弹出栈顶元素并输出,直至栈为空
while not stack.is_empty():
item = stack.pop()
print("弹出的整数为:%d" % item)
if __name__ == '__main__':
main()
```
注意:由于Python中没有栈结构,以上代码使用了自定义的Stack类来实现栈的基本操作。
实现顺序栈的基本操作。 1.initStack(S):栈S的初始化; 2.isEmpty(S):判断S是否栈空; (测试时,将栈清空,然后再删除,看是否有异常处理机制) 3.isFulI(S):判断S是否栈满; (测试时,将栈清空,然后再入栈,看是否有异常处理机制) 4. getTop(S):取栈顶元素,并返回该元素; 5. Push(S,x):将值为x的元素入栈; 6. Pop(S):出栈,并返回出栈的元素; 7. printStack(S):打印所有栈元素。
8. 创建StudentController.java控制器
在src/main/java/com/jr/controller目录下创建StudentController.java控制器,并添加以下内容:
```java
package com.jr.controller;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.jr.domain.Student;
import com.jr.domain.StudentService;
@WebServlet("/student/*")
public class StudentController extends HttpServlet {
private static final long serialVersionUID = 1L;
@Autowired
private StudentService studentService;
@Override
public void init() throws ServletException {
super.init();
SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this, getServletContext());
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String path = request.getPathInfo();
if (path == null || path.equals("/list")) {
String sNum = request.getParameter("sNum");
String name = request.getParameter("name");
String gender = request.getParameter("gender");
int currentPage = Integer.parseInt(request.getParameter("currentPage"));
List<Student> studentList = studentService.getStudentList(sNum, name, gender, currentPage);
int totalCount = studentService.getTotalCount(sNum, name, gender);
int totalPage = (totalCount % 10 == 0) ? (totalCount / 10) : (totalCount / 10 + 1);
Map<String, Object> resultMap = new HashMap<String, Object>();
resultMap.put("studentList", studentList);
resultMap.put("totalCount", totalCount);
resultMap.put("totalPage", totalPage);
ObjectMapper objectMapper = new ObjectMapper();
String json = objectMapper.writeValueAsString(resultMap);
response.setContentType("application/json;charset=utf-8");
response.getWriter().write(json);
} else if (path.equals("/add")) {
String sNum = request.getParameter("sNum");
String name = request.getParameter("name");
String gender = request.getParameter("gender");
int age = Integer.parseInt(request.getParameter("age"));
String tel = request.getParameter("tel");
Student student = new Student();
student.setsNum(sNum);
student.setName(name);
student.setGender(gender);
student.setAge(age);
student.setTel(tel);
studentService.addStudent(student);
response.sendRedirect(request.getContextPath() + "/index.jsp");
} else if (path.equals("/update")) {
int studentID = Integer.parseInt(request.getParameter("studentID"));
String sNum = request.getParameter("sNum");
String name = request.getParameter("name");
String gender = request.getParameter("gender");
int age = Integer.parseInt(request.getParameter("age"));
String tel = request.getParameter("tel");
Student student = new Student();
student.setStudentID(studentID);
student.setsNum(sNum);
student.setName(name);
student.setGender(gender);
student.setAge(age);
student.setTel(tel);
studentService.updateStudent(student);
response.sendRedirect(request.getContextPath() + "/index.jsp");
} else if (path.equals("/delete")) {
int studentID = Integer.parseInt(request.getParameter("studentID"));
studentService.deleteStudent(studentID);
response.sendRedirect(request.getContextPath()好的,以下是实现顺序栈的基本操作的代码:
```python
class Stack:
def __init__(self + "/index.jsp");
}
}
}
```
9. 创建index.jsp页面
在src/main/webapp目录下创建, size):
self.size = size
self.stack = [None] * size
self.top = -1
def isEmptyindex.jsp页面,并添加以下内容:
```html
<%@page contentType="text/html;charset=UTF-8" language="java"%>
(self):
return self.top == -1
def isFull(self):
return self.top == self.size - 1
def<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
getTop(self):
if self.isEmpty():
raise Exception("Stack is empty.")
return self.stack[self.top]
def push(self, x):
if self.isFull():
raise Exception("Stack is full.")
self.top += 1
self.stack[self.top]<head>
<meta charset="UTF-8">
<title>JavaWebProject</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery = x
def pop(self):
if self.isEmpty():
raise Exception("Stack is empty.")
x = self.stack[self.top]
/3.6.0/jquery.min.js"></script>
<style>
table, th, td {
border: 1px solid black self.top -= 1
return x
def printStack(self):
if self.isEmpty():
print("Stack is empty.")
;
border-collapse: collapse;
text-align: center;
padding: 5px;
}
.pagination {
display else:
print("Stack elements are:")
for i in range(self.top, -1, -1):
print(self.stack[i: inline-block;
}
.pagination a {
color: black;
float: left;
padding: 8px 16])
```
在上述代码中,我们定义了一个`Stack`类,包含了栈的基本操作函数。`px;
text-decoration: none;
border: 1px solid #ddd;
}
.pagination a.active {
background__init__`函数初始化栈,`isEmpty`函数判断栈是否为空,`isFull`函数判断栈是否已满,`-color: #4CAF50;
color: white;
border: 1px solid #4CAF50;
}
.paginationgetTop`函数获取栈顶元素,`push`函数将元素入栈,`pop`函数将元素出栈 a:hover:not(.active) {background-color: #ddd;}
.add-form, .update-form {
display: none;
position并返回,`printStack`函数打印栈中的所有元素。
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