java實現大整數的四則運算（java設計一個能進行四則運算的計算器）

本文目錄一覽：

• 1、JAVA中long型代碼，支持大整數的四則運算
• 2、運用JAVA中大數類實現大數的四則運算
• 3、編寫一個實現四則運算的JAVA程序

JAVA中long型代碼，支持大整數的四則運算

public long add(long a , long b){

BigInteger bigIntA = new BigInteger(a + “”);

BigInteger bigIntB = new BigInteger(b + “”);

return bigIntA.add(bigIntB).longValue;

}public long subtract(long a , long b){

BigInteger bigIntA = new BigInteger(a + “”);

BigInteger bigIntB = new BigInteger(b + “”);

return bigIntA.subtract(bigIntB).longValue;

}public long multiply(long a , long b){

BigInteger bigIntA = new BigInteger(a + “”);

BigInteger bigIntB = new BigInteger(b + “”);

return bigIntA.multiply(bigIntB).longValue;

}public long divide(long a , long b){

BigInteger bigIntA = new BigInteger(a + “”);

BigInteger bigIntB = new BigInteger(b + “”);

return bigIntA.divide(bigIntB).longValue;

}

運用JAVA中大數類實現大數的四則運算

import java.math.BigInteger;

public class BigIntegerGet {

public String getAdd(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.add(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

public String getSubtract(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.subtract(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

public String getMultiply(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.multiply(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

public String getDivide(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.divide(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

}

編寫一個實現四則運算的JAVA程序

import java.text.DecimalFormat;

import java.util.Scanner;

public class Zhidao {

public static void main(String[] args) {

String condition = “”;

Zhidao zhidao = new Zhidao();

do{

Scanner scanner = new Scanner(System.in);

try{

System.out.print(“請輸入第一個數：”);

double x = scanner.nextDouble();

System.out.print(“請輸入第二個數：”);

double y = scanner.nextDouble();

System.out.print(“請輸入運算符：”);

String s = scanner.next();

char z = s.charAt(0);

zhidao.yunsuan(x, y, z);

}catch(Exception e){

System.out.println(“請輸入正確的數據！”);

}

System.out.print(“是否繼續？continue：繼續，任意字元：結束”);

condition = scanner.next();

}while(“continue”.equals(condition));

}

public static void yunsuan(double x,double y,Character z){

DecimalFormat r=new DecimalFormat();

r.applyPattern(“#0.00”);

if(z.equals(‘+’)){

System.out.println(x+”+”+y+”=” + r.format((x+y)));

} else if(z.equals(‘-‘)){

System.out.println(x+”-“+y+”=” + r.format((x-y)));

} else if(z.equals(‘*’)){

System.out.println(x+”*”+y+”=” + r.format((x*y)));

} else if(z.equals(‘/’)){

if(y==0){

System.out.println(“被除數不能為0”);

} else{

System.out.println(x+”/”+y+”=” + r.format((x/y)));

}

}else{

System.out.println(“無法識別改運算符”);

}

}

}