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  • 大小: 2KB
    文件類型: .java
    金幣: 1
    下載: 0 次
    發布日期: 2021-06-14
  • 語言: Java
  • 標簽: 計算器??

資源簡介

RPN計算器 Program Input Each line of the input file (prob12.in) contains a series of numbers and operators. The program must evaluate these lines as RPN expressions. All tokens are separated by one or more spaces. Numbers may be negative. Valid operators are +(addition), -(subtraction), *(multiplication) and /(division). The last line of the file contains only the word END: 16 3 7 + * 4 32.125 13 – * 20 + 5 –3 * 4 2 / 6 3 1 – / + + END Program Output The program will print the computed result of each RPN expression on a separate line. 160 96.5 -10

資源截圖

代碼片段和文件信息 

import?java.io.*;
import?java.util.*;

public?class?RPNcalculator?{
public?static?void?main（String[]?args）?{

????String?fileName=“RPNInput.txt“;
????String?fileName2=“RPNOutput.txt“;
????Scanner?inputStream?=?null;
????PrintWriter?outputStream?=?null;

????//read
????try{
????????inputStream?=?new?Scanner（new?File（fileName））;?//try?to?open?the?file
????}
????catch（Exception?e）{
????????System.out.println（“Could?not?open?the?file?named?“+?fileName）;?//?if?it?doesn‘t?find?it?tell?them
????????System.exit（0）;??//?and?then?exit.
????}

????//write
????try{
????????outputStream?=?new?PrintWriter（new?FileOutputStream（fileName2true））;?//try?to?create?the?file
????}
????catch（Exception?e）{
????????System.out.println（“Could?not?open?the?file?named?“+?fileName2）;?//?if?it?doesn‘t?find?it?tell?them
????????System.exit（0）;??//?and?then?exit.
????}

????while（inputStream.hasNextLine（））{
????????String?equation?=?inputStream.nextLine（）;
????????if?（equation==null）??break;
????????Stack?tks?=?new?Stack

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