import java.text.NumberFormat;

public class LoopExample {

	public static void main(String[] args) {
		// Compute 1 + 2 + 3 + ... + 99 + 100

		// With a while loop
		System.out.println("With a while loop");
		int i = 1;
		int total = 0;
		while (i <= 100) {
			total += i;
			i++;
		}
		System.out.println("total = " + total + ", i = " + i);

		// another way
		i = 0;
		total = 0;
		while (i < 100) {
			i++;
			total += i;
		}
		System.out.println("total = " + total + ", i = " + i);

		// With a do-while loop
		System.out.println("\n\nWith a do-while loop");
		i = 0;
		total = 0;
		do {
			i ++;
			total += i;
		}while(i < 100);
		
		System.out.println("total = " + total + ", i = " + i);
		
		// With a for loop
		System.out.println("\n\nWith a for loop");
		total = 0;
		for (i = 1; i <= 100; i ++) {
			total += i;
		}
		System.out.println("total = " + total + ", i = " + i);
		
		// how many years to double an initial amount of $1000
		// on a 2% savings account
		double amount = 1000;
		double rate = 10; // 2%
		int year = 0;
		do {
			amount += rate / 100 * amount;
			year ++;
		}while(amount <= 2000);
		NumberFormat nf = NumberFormat.getCurrencyInstance();
		System.out.println("It takes " + year + " years to get "
				+ nf.format(amount));
		
		
		
		
		
		
		
		
		
		
	}

}