import java.util.Random;

public class Srv {
	
	public int lastDay(int month) {
		
		// Jan, Feb, March, etc.
		int[] months = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
		
		int lastDay = 0;
		
		if(month > 0 && month <= 12) {
			
			lastDay = months[month - 1];
		}
			
		return lastDay;
	}
	
	
	public boolean allDigits(String _str) {
		
		boolean allDigits = true;
		
		if(_str.length() == 0) {
			allDigits = false;
		}
		
		for(int i = 0; i < _str.length() && allDigits; i++) {
			
			// if the char is NOT a number
			if(!(_str.charAt(i) >= '0' && _str.charAt(i) <= '9'))
				allDigits = false;
		}
		
		return allDigits;
	}
	
	public boolean payday(int _day, int _month) {
		
		boolean isPayday = false;
		
		if((_month > 0 || _month <= 12) && (_day > 0 && _day <= lastDay(_month)) ) {
			
			if(_day == 15 || lastDay(_month) == _day) {
				
				isPayday = true;
			}
			
		}
	
		return isPayday;
	}
	
	public void printTriangle(int _num) {
		
		/*
		 *   printTriangle(3)
		 *   *
		 *   **
		 *   ***
		 */
		
		// going down the triangle (each row)
		for(int row = 1; row <= _num; row++) {
			
			// going across the row (each col)
			for(int col = 0; col < row; col++)
				System.out.print("*");
			
			System.out.println();
		}		
	}
	
	public String leftPad(String _str, int _spaces) {
		
		String result = "";
		
		for(int i = 0; i < _spaces; i++) {
			
			// * represents space
			result += "*";
		}
		
		// result = result + _str
		result += _str;
		
		return result;
	}
	
	public int genRandomNum(int _boundOne, int _boundTwo) {
		
		Random randObj = new Random();
		
		/*
		 * bound1 = 2
		 * bound2 = 5
		 * 4 values total
		 */
		
		int range = _boundOne - _boundTwo;
		int startingPoint = 0;
		
		if(range < 0 )
		{
			range *= -1;
			startingPoint = _boundOne;
		}
		else
			startingPoint = _boundTwo;
		
		range++;
		
		//randObj.nextInt("range value") + "where to start"
		int randNum = randObj.nextInt(range) + startingPoint;
		
		return randNum;
	}
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	

	
	
	
	
	
	
	
	
}