C_Comment_Parser.java

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

public class C_Comment_Parser {

    public static void main(String[] args) {

        System.out.println(parseComments("#include <stdio.h>\nint main()\n{\n\t/* printf() displays \n\t\t the string inside quotation*/\n\tprintf(\"Hello, World!\");\n\treturn 0;\n}"
                    ));
    }
    public static String parseComments(String code){
        char arr[] = code.toCharArray();
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i<arr.length; i++){
            // System.out.println(arr[i]);
            if(arr[i] == '/' && i+1<arr.length && arr[i+1]=='/'){
                    int j;
                    for(j=i+2; j<arr.length; j++){
                        if(arr[j] =='\n'){
                            break;
                        }
                    }
                    if(j != arr.length)
                        sb.append(arr[j]);
                    i = j;
            }else if(arr[i] == '/' && i+1<arr.length && arr[i+1]=='*'){
                int j;
                for(j=i+2; j<arr.length; j++){
                        if(arr[j]=='*' && j+1 < arr.length && arr[j+1] == '/')
                            break;
                    }
                    i = j+1;
            }else{
                sb.append(arr[i]);
            }
        }
        return sb.toString();
    }
    
}

/*
Output : 
#include <stdio.h>
int main()
{
	
	printf("Hello, World!");
	return 0;
}
*/