1    /* 
2    * Exploring and playing with arithmetic expressions while solving simple problems, including Crypto. 
3     */
4    
5    package expressions;
6    
7    public class ExpressionsThing {
8        public static void main(String[] args) {
9            //three expressions (one, two, and three) intended to compute the perimeter of a circle of radius 5 (3.14 as approximation of Pi)
10           double one = 3.14 * 5 + 5; // This is the incorrect expression, it is not fully parenthesized
11           System.out.println("one = " + one);
12   
13           double two = 3.14 * (5 + 5); //correct
14           System.out.println("two = " + two);
15   
16           double three = (3.14 * (5 + 5)); //correct
17           System.out.println("three = " + three);
18   
19           int four = (5 * 6);
20           System.out.println("four = " + four);
21   
22           double five = (55.0 / 2.0);
23           System.out.println("five = " + five);
24   
25           double six = (65.0 / 3.0);
26           System.out.println("six = " + six);
27   
28           double seven = (five + six);
29           System.out.println("seven = " + seven);
30   
31           double eight = (3.14 * (11.3 * 11.3)); //Area = (3.14 * (R * R))
32           System.out.println("eight = " + eight);
33   
34           double nine = (27.7 * 27.7); //Area = (S x S)
35           System.out.println("nine = " + nine);
36   
37           double ten = ((eight + nine) / 2.0); //average areas of circle and square w/ circle radius 11.3 and square side 27.7
38           System.out.println("ten = " + ten);
39   
40           double eleven = (.17 * 243.5); //17% of 243.5
41           System.out.println("eleven = " + eleven);
42   
43           //Crypto problem solutions
44           int twelve = (3/3); //Sources: 3, 3 | Goal: 1
45           System.out.println("twelve = " + twelve);
46   
47           int thirteen = ((7 - 4) - 2);//Sources: 4, 7, 2 | Goal: 1
48           System.out.println("thirteen = " + thirteen);
49   
50           int fourteen = ((9+7)/(1+3)); //Sources: 1, 3, 7, 9 | Goal: 4
51           System.out.println("fourteen = " + fourteen);
52   
53           int fifteen = (((2 + 2) * (4 + 6)) / 8); //Sources: 2, 2, 4, 6, 8 | Goal: 5
54           System.out.println("fifteen = " + fifteen);
55       }
56   }
57