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DeRoyaceDeRoyace
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simple python terminal built using Java
This project doesn't work completely like python
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‎PythonTerminal.java‎

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/**
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* Description : This program is inspired from python running on my Systems Comand Prompt terminal.
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* I started this program with the idea of making a calculator
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* Later i open my window and thought about what if i make it feel like python running
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* But its actually JAVA my old buddy :-)
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* ------------------------------------------------------------------------------------------------
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* @Rohit_Roy
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* @version 2021.0 (created on 01.12.2021)
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* @Student, Bsc CS Hons. (1st Year)
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* @SXC, Kolkata
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* ------------------------------------------------------------------------------------------------
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*/
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/**#
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* PythonTerminal => String input errors updated w.r.t quotes and blank spaces
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*/
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import java.util.*;
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// import java.lang.String;
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public class PythonTerminal
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{
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static String inputs; // gets the string from user
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static double num[]; // to store the numbers or the operands
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static char opera[]; // to store the operators
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static int size; // stores the number of operators
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static int count; // no. of spaces present
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public static void accept()
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{
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Scanner sc=new Scanner(System.in);
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//System.out.println("Your Calculator is here...");
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System.out.print("\n>>> ");
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inputs = sc.nextLine();
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int len=inputs.length();
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size=0;
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for(int i=0;i<len;i++)
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{
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char ch=inputs.charAt(i);
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if(ch=='+' || ch=='-' || ch=='*' || ch=='/' || ch=='^')
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{
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size++;
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}
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}
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} // end of accept()
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// Recursive function to store operators and operands seperately in arrays:
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public static void fillArray(String x, String temp, int i, int j)
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{
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//System.out.println(i + ", " +j);
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if(j==size+1 || x.equals(""))
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System.out.print("");
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else
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{
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char ch=x.charAt(0);
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if(ch=='+' || ch=='-' || ch=='*' || ch=='/' || ch=='^')
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{
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if(!temp.equals(""))
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{
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num[j]=Double.parseDouble(temp);
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j+=1;
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}
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opera[i]=ch;
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fillArray(x.substring(1),"",i+1,j);
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}
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else if(Character.isDigit(ch) || ( ch=='.' && Character.isDigit( x.charAt(1) ) ) )
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{
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temp+=ch;
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fillArray(x.substring(1),temp,i,j);
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}
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else
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{
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if(!temp.equals(""))
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{
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num[j]=Double.parseDouble(temp);
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j+=1;
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}
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fillArray(x.substring(1),"",i,j);
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}
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}
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} // end of fillArray()
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//inputsulations of the instructuions given by user:
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public static double operator(char c, double a, double b)
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{
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double cal=0.0d;
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switch(c)
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{
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case '+':
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cal=a+b;
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break;
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case '-':
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cal=a-b;
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break;
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case '*':
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cal=a*b;
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break;
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case '/':
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cal=a / b;
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break;
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case '^':
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cal=Math.pow(a,b);
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break;
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}
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return cal;
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} // end of operator()
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public static String addChar(String x, char ch)
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{
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int len=x.length();
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String sp="";
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for(int i=1; i<=len;i++)
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{
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sp+=ch;
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}
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return sp;
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}
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public static void countSpace(String x)
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{
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count=0;
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for(int i=0;i<x.length();i++)
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{
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char ch=x.charAt(i);
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if(ch==' ')
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count++;
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}
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}
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public static void recognize(String x)
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{
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int len=x.length();
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char begin=x.charAt(0);
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char end=x.charAt(len-1);
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String temp = x.substring(1,len-1);
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countSpace(x);
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if( (begin == '\"' && end == '\"') || (begin == '\'' && end == '\'') )
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{
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System.out.println("\'" + temp+ "\'");
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}
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else
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{
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if( begin == '\"' || begin == '\'' )
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{
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System.out.println(" File \"<stdin>\", line 1");
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System.out.println(" "+ x);
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System.out.println(" ^");
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System.out.println("SyntaxError: unterminated string literal (detected at line1)");
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}
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else if( end == '\"' || end == '\'' )
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{
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System.out.println(" File \"<stdin>\", line 1");
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System.out.println(" "+ x);
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System.out.println(" "+ addChar(x,' ')+"^");
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System.out.println("SyntaxError: unterminated string literal (detected at line1)");
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}
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else if(count>=1)
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{
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System.out.println(" File \"<stdin>\", line 1");
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System.out.println(" "+ x);
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System.out.println(" "+addChar(x,'^'));
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System.out.println("SyntaxError: invalid syntax. Perhaps you forget a comma?");
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}
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else
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{
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System.out.println("Traceback (most recent call last):");
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System.out.println(" File \"<stdin>\", line 1, in <module>");
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System.out.println("NameError: name '"+x+ "' is not defined");
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}
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}
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}
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public static void main(String[] args)
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{
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accept();
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if(inputs.equals("exit()") || inputs.equals("exit(0)"))
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{
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System.exit(0);
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}
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else
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{
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num=new double[size+1];
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opera=new char[size];
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fillArray(inputs+" ","",0,0);
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/*
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for(int i=0;i<size;i++)
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System.out.print(opera[i]+", ");
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System.out.println("\nNumbers are: ");
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for(int i=0;i<size+1;i++)
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System.out.print(num[i]+", ");
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*/
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double result=0.0d;
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int j=0;
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for(int i=0;i<size+1;i++)
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{
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if(j<size)
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{
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result=operator(opera[j],num[i],num[i+1]);
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num[i+1]=result;
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j+=1;
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}
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}
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if(size>0)
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System.out.println(result);
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else
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recognize(inputs);
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}
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main(args); // calls the main function
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}// end of main()
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} // end of class

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