DataTypeFinder

package dataTypesAndVariables;

import java.util.Scanner;

public class dataTypeFinder {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();


        while(true) {
            if (input.equals("END")) {
                break;
            }

            boolean bool = false;
            boolean character = false;
            boolean integer = false;
            boolean string = false;
            boolean doubleNum = false;


            if (input.charAt(0) >= '0' && input.charAt(0) <= '9') {
                for (int i = 0; i < input.length(); i++) {
                    if (input.charAt(i) == '.') {
                        doubleNum = true;
                    }
                }
                if (!doubleNum) {
                    integer = true;
                }
            }else if(input.charAt(0) == '-'){
                for (int i = 1; i < input.length() ; i++) {
                    if(input.charAt(i) == '.'){
                        doubleNum = true;
                    }
                    if((input.charAt(i) < '0' || input.charAt(i) > '9') && input.charAt(i) != '.'){
                        string = true;
                    }
                }

                if(!string && !doubleNum){
                    integer = true;
                }

                if(string){
                    integer = false;
                    doubleNum = false;
                }
        }else if(input.equals("true") || input.equals("false")){
                bool = true;
            }else{
                if(input.length() == 1){
                    character = true;
                }else{
                    string = true;
                }
            }

            if(bool){
                System.out.printf("%s is boolean type%n",input);
            }else if(doubleNum){
                System.out.printf("%s is floating point type%n",input);
            }else if(integer){
                System.out.printf("%s is integer type%n",input);
            }else if(character){
                System.out.printf("%s is character type%n",input);
            }else if(string){
                System.out.printf("%s is string type%n",input);
            }

            input = scanner.nextLine();
        }

    }
}