Java初學練習答案（迴圈）

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/*題目如下：1 （for 迴圈）*編程找出四位整數abcd 中滿足下述關係的數。(ab+cd)(ab+cd)=abcd2 （迴圈）*讀入一個整數n，輸出如形n = 3  * ********n = 4   *  *** ************思路：讀入的整數n，就是外層迴圈的迴圈次數。對於每一行，要做的事情：1. 輸出若干個空格；2. 輸出若干個星；3. 換行。提示：輸出不換行，用System.out.print()3. （迴圈）**求水仙花數。所謂水仙花數，是指一個三位元abc，如果滿足a3+b3+c3=abc，則abc 是水仙花數。4. （迴圈）**輸入一個整數，計算它各位上數位和。（注意：是任意位的整數）空格： n-1 依次遞減   星號：1 3 5 71 2 3 4*/package MyTest;import java.util.Scanner;public class ChapUnitOne {//第一題答案public void AnswerOne(){int a,b,c,d;/*int i = 1234;a = i / 1000;b = i / 100 % 10;c = i / 10 % 10;d = i % 10;System.out.println(a);System.out.println(b);System.out.println(c);System.out.println(d);*/for(int i = 1000;i<9999;i++){a = i / 1000;b = i / 100 % 10;c = i / 10 % 10;d = i % 10;int ab = a*10+b;int cd = c*10+d;int ad = ab+cd;if(ad*ad == i){System.out.println(i);}}}//第二題答案public void AnswerTwo(){Scanner num = new Scanner(System.in);System.out.println("請輸入一個整數");int mynum = num.nextInt();for(int i=0; i<mynum; i++){for (int j=0; j<=mynum-i-1; j++){System.out.print(" ");}for (int j=0; j<=i*2; j++){System.out.print("*");}System.out.println();}}//第三題答案public void AnswerThree(){for(int i = 100;i<999;i++){int a = i / 100 % 10;int b = i / 10 % 10;int c = i % 10;if(a*a*a+b*b*b+c*c*c == i){System.out.println("該數字為水仙花數:"+i);}}}//第四題答案public void AnswerFour(){Scanner num = new Scanner(System.in);System.out.println("請輸入一個整數：");int mynum = num.nextInt();int sum = 0;/* int a = i / 100 % 10; int b = i / 10 % 10;     int c = i % 10;*/System.out.print("Sum = ");while (mynum>0){int temp = mynum%10;sum += mynum%10;mynum = mynum/10;if(mynum !=0 )System.out.print(temp+"+");elseSystem.out.print(temp);}System.out.println(" = "+sum);}public static void main(String[] args) {Scanner i = new Scanner(System.in);System.out.println("請輸入您想查看答案的題號：");int num = i.nextInt();ChapUnitOne myanswer = new ChapUnitOne();switch(num){case 1:myanswer.AnswerOne();break;case 2:myanswer.AnswerTwo();break;case 3:myanswer.AnswerThree();break;case 4:myanswer.AnswerFour();break;}}}

　　

Java初學練習答案（迴圈）