關於下列 C 程式碼，請說明程式執行後，程式碼編號 27～33 的輸出，以及其運算邏輯。

#include <stdio.h> #define SIZE 30

typedef enum direction { North, South, East=3, West } dir_t;

int f1(int a, int b) { int x = 3.0 / a; double y = (a/2) * (b%3) + x; return y; }

int f2(dir_t d) { d = (North+East)/2 > d ? East : West; return d; }

int f3(int a, int b) { if (b==a || b<=1) return a+b; else if (a<=1) return b-a; else return f3(a-b, a-1)+b+a; }

int f4(int a, int b) { int data[SIZE]; for (int i=1, k=0; i<a; i++) { if (i%2==0) data[k++]=i; } return data[b]; }

unsigned int f5(unsigned int a, unsigned int b) { return (~a&b); }

int main() { printf("%d\n", f1(10, 4)); printf("%d\n", f2(South)); printf("%d\n", f3(6, 4)); printf("%u\n", f3(7, 4)); printf("%d\n", f4(20, 5)); printf("%d\n", f4(10, 4)); printf("%u\n", f5(4, 7)); return 0; }

針對下列 C++ 程式，請標示出 Except 類別的 f1、⋯、f6 函式中有問題的函式，並說明其問題之原因；並請說明若將有問題的函式和程式碼刪除，其程式執行後之輸出。

#include <stdexcept> #include <iostream> #include <string> using namespace std;

class Except { public: void f1(int c); void f2(); void f3(); void f4(); void f5(); void f6(); };

int main() { Except e; e.f1(1); e.f2(); e.f3(); e.f4(); e.f5(); e.f6(); return 0; }

void Except::f1(int c) { if (c<0) throw out_of_range("large"); cout<<"exc1"<<endl; }

void Except::f2() { f1(-1); }

void Except::f3() { try { f1(-1); cout<<"ok"<<endl; } catch(exception &e) { cout<<"exc2"<<endl; } }

void Except::f4() { try { throw out_of_range("no"); } catch(out_of_range &e) { cout<<e.what()<<endl; cout<<"exc3"<<endl; } }

void Except::f5() { try { throw out_of_range("yes"); } catch(exception &e) { cout<<"exc41"<<endl; } catch(out_of_range &e) { cout<<e.what()<<endl; cout<<"exc42"<<endl; } }

void Except::f6() { try { throw out_of_range("ok"); } finally { cout<<"exc6"<<endl; } }

針對下列 Java 程式碼，請完成統一塑模語言（UML）類別圖 (a)～(e)；另外請標示出錯誤程式碼行數並說明錯誤原因；以及說明若將錯誤行數程式碼予以註解後，執行其程式的輸出。

import java.io.*;

interface Pet { public abstract int eat(int f); };

class Dog implements Pet { public Dog(int f) { food = f; }

public int eat(int f) {
    food += f;
    return food;
}

private int food;

};

public class Main { public static void main(String[] args) { Pet d1 = new Pet(); Pet d2 = new Dog(); Pet d3 = new Dog(5); d1.eat(5); d2.eat(5); System.out.println("dog: "+d3.eat(5)); } }

UML 類別圖中的空格：

針對下列 Python 程式碼，依序在兩個 Terminal 執行 server.py 和 client.py 後，在 client.py 輸入 Tom 和 quit；請說明 client.py 的 Terminal 之輸出內容，並說明 Line 03、04、05 程式碼的運作邏輯。

server.py：

server.py

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind(('127.0.0.1', 7000)) s.listen(5) print('wait for connection...')

while True: conn, addr = s.accept() print('connected by ' + str(addr)) indata = conn.recv(1024) print('recv: ' + indata.decode())

if 'quit' in indata.decode():
    outdata = 'bye'
else:
    outdata = 'hi ' + indata.decode()

conn.send(outdata.encode())
conn.close()

if 'quit' in indata.decode():
    break

print('listen...')

s.close()

client.py：

client.py

import socket

while True: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(('127.0.0.1', 7000)) name = input('>name:') print('send:' + name) s.send(name.encode()) indata = s.recv(1024) s.close() print('>' + indata.decode())

if 'quit' in name:
    break