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public class NFactorial
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{
public static int add(int a, int b)
{
return a + b;
}
public static int sun(int a, int b)
{
return a - b;
}
public static double mul(int a, int b)
{
return a * b;
}
public static double div(int a, int b)
{
return (double)a/b;
}
public static void main(String[] args)
{
System.out.println(NFactorial.add(5, 5));
System.out.println(NFactorial.sun(5, 5));
System.out.println(NFactorial.mul(5, 5));
System.out.println(NFactorial.div(5, 5));
System.out.println();
}
}
强烈要求追加分，我花了一个多小时给你写的
累死我了！
1，分数类
public class Fraction {
private int numerator; //分子
private int denominator; //分母
public Fraction() {
numerator = 0;
denominator = 1;
}
public Fraction(int newNumerator, int newDenominator) {
if (newDenominator == 0) { //分母不能为零
System.out.println("分母为零！");
System.exit(0);
}
numerator = newNumerator;
denominator = newDenominator;
}
public void setNumerator(int newNumerator) {
numerator = newNumerator;
}
public void setDenominator(int newDenominator) {
denominator = newDenominator;
}
public void setBoth(int newNumerator, int newDenominator) {
numerator = newNumerator;
denominator = newDenominator;
}
public int getNumerator() {
return numerator;
}
public int getDenominator() {
return denominator;
}
public Fraction plus(Fraction f) { //加法(返回分数和)
int newNumerator = getNumerator() * f.getDenominator() +
f.getNumerator() * getDenominator();
int newDenominator = getDenominator() * f.getDenominator();
Fraction plus = new Fraction(newNumerator, newDenominator);
plus.reduce();
return plus;
}
public Fraction minus(Fraction f) { //减法(返回分数差)
int newNumerator = getNumerator() * f.getDenominator() -
f.getNumerator() * getDenominator();
int newDenominator = getDenominator() * f.getDenominator();
Fraction minus = new Fraction(newNumerator, newDenominator);
minus.reduce();
return minus;
}
public Fraction multiply(Fraction f) { //乘法(返回分数积)
int newNumerator = getNumerator() * f.getNumerator();
int newDenominator = getDenominator() * f.getDenominator();
Fraction minus = new Fraction(newNumerator, newDenominator);
minus.reduce();
return minus;
}
public Fraction divide(Fraction f) { //除法(返回分数商)
int newNumerator = getNumerator() * f.getDenominator();
int newDenominator = getDenominator() * f.getNumerator();
Fraction minus = new Fraction(newNumerator, newDenominator);
minus.reduce();
return minus;
}
public void output() { //输出分数
System.out.print(getNumerator() + "/" + getDenominator());
}
private void reduce() { //化简分数(分子分母同时除以最大公约数)
int max = maxCommonDivisor(getNumerator(), getDenominator());
numerator = getNumerator() / max;
denominator = getDenominator() / max;
}
private int maxCommonDivisor(int m, int n) { //返回m,n的最大公约数
int max = 1; //初始化最大公约数
int min = Math.min(Math.abs(m), Math.abs(n)); //m,n中绝对值较小的
for (int i = 1; i = min; i++) {
if ((m % i == 0) (n % i == 0)) { //m,n的公约数
max = i;
}
}
return max;
}
}
分数类测试
public class FractionDemo {
public static void main(String[] args) {
Fraction demo1 = new Fraction(1, 4);
Fraction demo2 = new Fraction(4, 6);
demo1.output();
System.out.print(" + ");
demo2.output();
System.out.print(" = ");
demo1.plus(demo2).output();
System.out.println();
demo1.output();
System.out.print(" - ");
demo2.output();
System.out.print(" = ");
demo1.minus(demo2).output();
System.out.println();
demo1.output();
System.out.print(" * ");
demo2.output();
System.out.print(" = ");
demo1.multiply(demo2).output();
System.out.println();
demo1.output();
System.out.print(" / ");
demo2.output();
System.out.print(" = ");
demo1.divide(demo2).output();
System.out.println();
}
}
2，长方形类
//矩形类，求矩形的周长和面积
public class Rectangle {
private double length; //长
private double width; //宽
public Rectangle() {
length = 0;
width = 0;
}
public Rectangle(double newLength, double newWidth) {
length = newLength;
width = newWidth;
}
public void setLength(double newLength) {
length = newLength;
}
public void setWidth(double newWidth) {
length = newWidth;
}
public void setBoeder(double newLength, double newWidth) {
length = newLength;
width = newWidth;
}
public double getLength() {
return this.length;
}
public double getWidth() {
return this.width;
}
public double getPerimeter() { //求周长
return (length + width) * 2;
}
public double getArea() { //求面积
return length * width;
}
}
长方形类演示
public class RectangleDemo {
public static void main(String[] args) {
Rectangle demo = new Rectangle(5, 4); //创建对象，长为5，宽为4
System.out.println("矩形的周长是：" + demo.getPerimeter());
System.out.println("矩形的面积是：" + demo.getArea());
}
}
你可以写个分数类,下面是参考:\x0d\x0a\x0d\x0apublic class Fraction {\x0d\x0a private Integer numerator; // 分子;\x0d\x0a private Integer denominator; // 分母\x0d\x0a\x0d\x0a /**\x0d\x0a * 构造器\x0d\x0a */\x0d\x0a public Fraction() {\x0d\x0a }\x0d\x0a\x0d\x0a public Fraction(Integer numerator, Integer denominator) {\x0d\x0a this.numerator = numerator;\x0d\x0a this.denominator = denominator;\x0d\x0a }\x0d\x0a\x0d\x0a public Integer getDenominator() {\x0d\x0a return denominator;\x0d\x0a }\x0d\x0a\x0d\x0a public void setDenominator(Integer denominator) {\x0d\x0a this.denominator = denominator;\x0d\x0a }\x0d\x0a\x0d\x0a public Integer getNumerator() {\x0d\x0a return numerator;\x0d\x0a }\x0d\x0a\x0d\x0a public void setNumerator(Integer numerator) {\x0d\x0a this.numerator = numerator;\x0d\x0a }\x0d\x0a\x0d\x0a /**\x0d\x0a * 求最大公约数\x0d\x0a * \x0d\x0a * @return\x0d\x0a */\x0d\x0a private int getGCD(int a, int b) {\x0d\x0a int max = Math.max(a, b);\x0d\x0a int min = Math.min(a, b);\x0d\x0a int mod = max % min;\x0d\x0a if (mod == 0) {\x0d\x0a return min;\x0d\x0a } else {\x0d\x0a return this.getGCD(mod, min);\x0d\x0a }\x0d\x0a }\x0d\x0a\x0d\x0a /**\x0d\x0a * 简化和约分\x0d\x0a * \x0d\x0a * @return\x0d\x0a */\x0d\x0a public Fraction simplify() {\x0d\x0a // 格式化\x0d\x0a if (this.numerator == 0) {\x0d\x0a this.denominator = null;\x0d\x0a return this;\x0d\x0a } else if (this.denominator * this.numerator 0\x0d\x0a this.denominator
回答于 2022-12-11
public static void main(String[] args) {
double scores[] = new double[5];
double total = 0;
double avg = 0;
double max = 0;
double min = 0;
int count=0;
String inputStr=null;
System.out.println("请输入5名学生的成绩：");
Scanner input = new Scanner(System.in);
while(count5){
try{
if(count 5){
System.out.println("请输入第"+(count+1)+"个分数：");
}
inputStr=input.nextLine();
scores[count++]=Double.valueOf(inputStr.trim());
}catch(Exception e){
if(inputStr!=null "exit".equals(inputStr.trim())){
System.out.println("您已成功结束程序");
System.exit(0);
}
System.out.println("若想结束请输入：exit");
System.out.print("您输入的分数不是数值类型，");
count--;
}
}
input.close();
Arrays.sort(scores);
min=scores[0];
max=scores[scores.length-1];
for(double score :scores){
total += score;
}
avg=total/scores.length;
System.out.println("总成绩是" + total);
System.out.println("最高分是" + max);
System.out.println("最低分是" + min);
System.out.println("平均分是" + avg);
}
//-------------------------------------------------------------------------
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
while(true){
Double[] scores = null;
double total = 0;
double avg = 0;
double max = 0;
double min = 0;
int count=1;
ListDouble inputScores=new ArrayListDouble();
String inputStr=null;
System.out.println("请输入要统计学生的成绩（理论上可以输入无限个，前提是你有那么大的内存）：");
while(true){
try{
System.out.println("请输入第"+count+++"个分数，或输入ok进行计算，离开请输入exit");
inputStr=input.nextLine();
inputScores.add((double)Double.valueOf(inputStr.trim()));
}catch(Exception e){
if(inputStr!=null "exit".equals(inputStr.trim().toLowerCase())){
System.out.println("您已成功结束程序");
input.close();
System.exit(0);
}
if(inputStr!=null "ok".equals(inputStr.trim().toLowerCase())){
break;
}
System.out.println("您输入的分数不是数值类型，");
System.out.println("若想结束请输入exit ，若想计算结果请输入ok");
count--;
}
}
if(inputScores.size()==0){
System.out.println("您没有输入学生成绩，无数据可统计，程序结束。");
return ;
}
scores=inputScores.toArray(new Double[inputScores.size()]);
Arrays.sort(scores);
min=scores[0];
max=scores[scores.length-1];
for(double score :scores){
total += score;
}
avg=total/scores.length;
System.out.println("总成绩是" + total);
System.out.println("最高分是" + max);
System.out.println("最低分是" + min);
System.out.println("平均分是" + avg);
}
}