public class Main { //劉任昌2022.12.16類別名稱Main
public static void main(String[] args)//必須存成Monkey.java
{ int r = 16; //宣告整數r=方法sum
for (int i =0; i < r; i++) { //迴圈
System.out.print(i + "累加 "+ sum(i) );
System.out.println(" 累乘機 "+ f(i) );}
}
public static int sum(int k) { //方法(函數sum)參數 k
if (k > 0) { //條件判斷
return k + sum(k - 1); //k>0, 計算 k + sum(k-1)遞迴
} else { //遞迴,類似f(f(f(x)))函數
return 0;
}
}
public static int f(int k) { //方法(函數f)參數 k
if (k > 0) { //條件判斷
return k * f(k - 1); //k>0, 計算 k * f(k-1)遞迴
} else { //遞迴,類似f(f(f(x)))函數
return 1;
}
}
}
w3schools編寫Java程式語言 微軟VS Code編寫Java程式語言 Java程式語言 public class Main {/*劉任昌w3schools內建方法length,charAt*/ public static void main(String[] args) { String a = "狗吃大便,貓抓鼠"; String b = ""; /*字串b初始值是空的*/ int c = a.length(); /*方法 length() 得到字串長度*/ System.out.println("原來字串: " + a); System.out.println("字串長度: " + c); for (int i = 0; i 下次上課Java程式語言 import java.util.Scanner; // Import the Scanner class class MyClass { public static void main(String[] args) { String a, b=""; Scanner myObj = new Scanner(System.in); // Create a Scanner object System.out.print("輸入: "); a = myObj.nextLine(); // Read user input for (int i = 0; i
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