close
301
import java.util.*;
class JPA03 {
public static void main(String argv[]) {
Scanner keyboard = new Scanner(System.in); //Scanner方法，獲取使用者輸入
System.out.println("Input:");
int x = keyboard.nextInt();
int sum = 0; //設一變數為0，之後用於加總數值
for (int i = 1; i <= x; i++) { //設一變數為1，小於等於使用者輸入的整數，每回圈一次增加1
sum = sum + i; //每迴圈一次，將該次迴圈的數值添加到加總數值中
}
System.out.println("1 + ... + " + x + " = " + sum); //使用 + 來插入變數
}
}
302
import java.util.Scanner;
public class JPA03 {
public static void main(String[] args) {
int i = 1, j = 1, count = 0;
for (i = 1; i <= 3; i++) { //第一個迴圈，i從1到3
for (j = 1; j <=9 ; j++){ //第二個迴圈，i從1到9
count = count + 1; //每次回圈 i 增加 1
}
}
System.out.printf("count = %d\n", count);
}
}
303
import java.util.Scanner;
public class JPA03 {
public static void main(String[] args) {
int i, num, sum = 0;
System.out.printf("1~1000中的完美數有: ");
for (num = 2;num <= 1000;num++){ //設 num 為 1~1000 的數字迴圈
sum = 0; //歸零加總值，清空上一個數字迴圈的加總值
for (i=1;i < num;i++) { //設 i 為因數，小於 num(不能等於自己))
if(num%i == 0){ //若num除以i的餘數為零
sum = sum + i; //就將該數字加總起來
}
}
if (num == sum) { //如果最後的加總值等於本身，則打印出來
System.out.printf("%d ",num);
}
}
System.out.printf("\n");
}
}
304
import java.util.Scanner;
public class JPA03 {
public static void main(String[] args) {
int total = 0;
int s = 0;
int count = 0;
double average;
System.out.print("Please enter meal dollars or enter -1 to stop: ");
Scanner keyboard = new Scanner(System.in); //Scanner方法，獲取使用者輸入
s = keyboard.nextInt(); //讀取輸入
while(s != -1){
total = total + s; //加總 (放在讀取輸入前面，避免將 -1 計算)
count = count + 1; //計數
System.out.print("Please enter meal dollars or enter -1 to stop: "); //迴圈顯示此訊息
s = keyboard.nextInt(); //迴圈讀取輸入
}
System.out.println("餐點總費用:"+ total);
System.out.printf(" %d 道餐點平均費用為: %.2f %n",count,((double)total/count)); // 將 total 變成 double 型態來顯示浮點數值
}
}
305
import java.util.Scanner;
public class JPA03 {
static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args) {
test();
test();
test();
}
public static void test() {
System.out.printf("Please enter one value: "); //顯示要求使用者輸入的訊息
Scanner keyboard = new Scanner(System.in); //Scanner方法，獲取使用者輸入
int x = keyboard.nextInt(); //讀取輸入值
if( x>=1 && x<=10){ //if 條件判斷 是否介於1 ~ 10 之間
int sum =1; //設一變數，初始值為1，來進行乘法階乘
for(int i=1;i<=x;i++){ //for 迴圈用於乘法階乘
sum = sum * i;
}
System.out.printf("%d!: %d\n",x,sum);
}else{ //若不滿足 if 條件
System.out.println("Error, the value is out of range.");
}
}
}
306
import java.util.*;
public class JPA03 {
public static void main (String argv[]){
int num1, num2;
Scanner input = new Scanner(System.in);
System.out.println("Input:");
num1 = input.nextInt();
while (num1 != 999) {
num2 = input.nextInt();
System.out.println(powerOf(num1, num2));
System.out.println("Input:"); //在迴圈中再次要求使用者輸入訊息
num1 = input.nextInt(); //因為num1原先在迴圈外，所以進入迴圈後也要寫入其中讓迴圈能夠繼續獲取兩個變數來運作
}
}
static int powerOf (int m, int n) {
int sum =1;
while(n>0){ // 題目要求以while迴圈來計算次方
sum=sum*m; //每迴圈乘一次底數
n--; //每迴圈次方減少1
}
return sum; //返回結果
}
}
307
import java.io.*;
public class JPA03 {
public static void main (String argv[]) throws IOException {
int num1, num2;
java.util.Scanner k = new java.util.Scanner(System.in); //使用Scanner方法
System.out.println("Input:");
num1 = k.nextInt(); //讀取第一個變數
while (num1 != 999) { //若讀取到999即停止
num2 = k.nextInt(); //讀取第二個變數
System.out.println(gcd(num1,num2)); //輸出自訂函數的返回值
System.out.println("Input:");
num1 = k.nextInt();
}
}
static int gcd (int m, int n) {
int result;
while (n != 0){ //採用輾轉相除法，餘數為0即停止
result = m%n; //設一變數，指派餘數
m = n; //將n指派給m
n = result; //result指派給n，此時若餘數n不為0，則迴圈繼續進行輾轉相除
}
return m;
}
}
308
import java.util.Scanner;
public class JPA03 {
static Scanner keyboard = new Scanner(System.in);
static int i = -1;
public static void main(String[] args) {
int total = 0, s = 0;
System.out.print("請輸入消費金額，或輸入-1結束：");
s = keyboard.nextInt();
do{
total = total + s; //先加總，以免將 -1 也一併計算
System.out.print("請輸入消費金額，或輸入-1結束：");
s = keyboard.nextInt();
}while(s != -1); //當s 不等於 -1 的時候，就繼續進行迴圈
System.out.println("電腦週邊總消費："+total);
}
}
309
import java.io.*;
class JPA03 {
public static void main(String argv[]) throws IOException {
java.util.Scanner k = new java.util.Scanner(System.in); //使用 Scanner 方法
int x = k.nextInt(); 讀取輸入
int sum =0; //設一變數為0，用於加總
for (int i=1;i<=x;i++){
if(i%7==0){ //若除以7餘數為0，則跳過此次迴圈
continue;
}
if(i%3==0 || i%5==0){ //若除以3或5餘數為0，則加總該整數
sum = sum + i;
}
}
System.out.println("Answer: " + sum);
}
}
310
import java.util.Scanner;
public class JPA03 {
static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args) {
System.out.print("請輸入 n 的值(n > 0，且為偶數):");
int x = keyboard.nextInt();
int sum = 0 ,num = 2; //sum 為加總 ， num 為每一項的值
do{
System.out.print("請輸入 n 的值(n > 0，且為偶數):");
x = keyboard.nextInt();
}while(x<0 || x%2!=0); //若滿足此條件的話，重複迴圈
do {
sum = sum + num; //加總，每次加上前一項的值
num = num + 2; //每次回圈項值+2
}while(num<=x); //重複迴圈直到 num > x
System.out.printf("2+4+...+%d=%d\n",x,sum);
}
}
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