Macro string replacer (String Replacer)

## input.txt

#define PI 3.14
#define p(y) y+y

void main(){
	int a ;
	int PI ;
	a= PI ;
	int b;
	b= p(y) ;
}


## Macro_prac.java

import java.io.*;

public class Macro_prac {

	String cur;
	String[][] macro_arr;
	int arrindex=0,strpt=0;
	boolean ind;
	
	String sep(){
		String temp="";
		int i=strpt;
		while((i<cur.length()) && (cur.charAt(i) != ' ')){
			temp=temp+cur.charAt(i);
			i++;
		}		
		strpt=++i;
		return temp;
	}
	
	void arr_setter(String var,String val){
		macro_arr[arrindex][0]=var;
		macro_arr[arrindex][1]=val;
	}
	
	public static void main(String[] args) {
		FileReader in;
		FileWriter out;
		String var,val;
		String temp="";
		
		try {
			in = new FileReader("input.txt");
			BufferedReader br=new BufferedReader(in);
			out = new FileWriter("ouput.txt");
			BufferedWriter bw=new BufferedWriter(out);
			
			Macro_prac ob=new Macro_prac();
			ob.macro_arr=new String[10][2];
			
			ob.cur=br.readLine();
			while(ob.cur != null){
				while(ob.strpt <= ob.cur.length()){
					ob.ind=true;
					temp=ob.sep();
					if(temp.equals("#define")){
						var=ob.sep();
						val=ob.sep();
						ob.arr_setter(var, val);
						ob.arrindex++;
					}
					else{
						for(int i=0;i<=ob.arrindex;i++){
							if(temp.equals(ob.macro_arr[i][0])){
								out.write(ob.macro_arr[i][1]);
								if(ob.strpt<ob.cur.length()){
									out.write(" ");
								}
								else{
									out.write("\n");
								}
								ob.ind=false;
							}
						}
						if(ob.ind){
							out.write(temp);
							if(ob.strpt<ob.cur.length()){
								out.write(" ");
							}
							else{
								out.write("\n");
							}
						}
					}
				}
				ob.strpt=0;
				ob.cur=br.readLine();
			}
			br.close();
			bw.close();
		} catch (Exception e) {

			e.printStackTrace();
		}
		
	}
	
}


## Output.txt

void main(){
	int a ;
	int 3.14 ;
	a= 3.14 ;
	int b;
	b= y+y ;
}