1 public class CalcFunction {
 2     static int count=0,count1=0;
 3     public static String add(Fraction a, Fraction b) //加法 参考分数间加减乘除 用四个变量表示两个分数的分子分母
 4     {
 5         int i, j, k, s, m, n, p;
 6         i = a.getNumerator();// 分子
 7         j = a.getDenominator();// 分母
 8         k = b.getNumerator();
 9         s = b.getDenominator();
10         m = i * s + j * k;
11         n = s * j;
12         p = Calc.getGCD(m, n);
13         return Calc.Reduction(m / p, n / p);
14
15     }
16
17     public static String div(Fraction a, Fraction b)//除法  设置生成的随机数不为0，则不存在除数为0的情况
18
19     {
20         int i, j, k, s, m, n, p;
21         i = a.getNumerator();// 分子
22         j = a.getDenominator();// 分母
23         k = b.getNumerator();
24         s = b.getDenominator();
25         m = s * i;
26         n = j * k;
27         p = Calc.getGCD(m, n);
28         return Calc.Reduction(m / p, n / p);
29     }
30
31     public static String sub(Fraction a, Fraction b)//减法
32
33     {
34         int i, j, k, s, m, n, p;
35         i = a.getNumerator();// 分子
36         j = a.getDenominator();// 分母
37         k = b.getNumerator();
38         s = b.getDenominator();
39         m = i * s - j * k;
40         n = j * s;
41         p = Calc.getGCD(m, n);
42         return Calc.Reduction(m / p, n / p);
43     }
44
45     public static String mul(Fraction a, Fraction b)//乘法
46
47     {
48         int i, j, k, s, m, n, p;
49         i = a.getNumerator();// 分子
50         j = a.getDenominator();// 分母
51         k = b.getNumerator();
52         s = b.getDenominator();
53         m = i * k;
54         n = j * s;
55         p = Calc.getGCD(m, n);
56         return Calc.Reduction(m / p, n / p);
57     }
58
59 }

 1     @Test
 2     public void testAdd() {
 3          Fraction a = new Fraction(2,3,"2/3");
 4          Fraction b = new Fraction(1,3,"1/3");
 5
 6          assertEquals(CalcFunction.add(a,b), "1");
 7     }
 8
 9     @Test
10     public void testDiv() {
11            Fraction a = new Fraction(2,3,"2/3");
12            Fraction b = new Fraction(1,3,"1/3");
13
14            assertEquals(CalcFunction.div(a,b), "2");
15     }
16
17     @Test
18     public void testSub() {
19           Fraction a = new Fraction(2,3,"2/3");
20           Fraction b = new Fraction(1,3,"1/3");
21
22           assertEquals(CalcFunction.sub(a,b), "1/3");
23     }
24
25     @Test
26     public void testMul() {
27           Fraction a = new Fraction(2,3,"2/3");
28           Fraction b = new Fraction(1,3,"1/3");
29
30           assertEquals(CalcFunction.mul(a,b), "2/9");
31     }

 1     @Before
 2     public void setUp() throws Exception {
 3     }
 4
 5     @After
 6     public void tearDown() throws Exception {
 7     }
 8
 9     @Test
10     public void testGetGCD() {
11         assertEquals(Calc.getGCD(10, 5), 5);
12     }
13
14     @Test
15     public void testReduction() {
16         assertEquals(Calc.Reduction(9, 5), "9/5");
17     }