加减乘除的算法
public class jcsf {
public double sum(double a,double b)
{
return a+b;
}
public double substract(double a,double b)
{
return a-b;
}
public double divide(double a,double b)
{
return a/b;
}
public double multiply(double a,double b)
{
return a*b;
}
}
加减乘除的测试用例
public class jcsfTest {
private jcsf jcsf;
@Before
public void setUp() throws Exception {
jcsf = new jcsf();
}
@Test
public void sum() throws Exception {
assertEquals(7d,jcsf.sum(3d,4d),0);
}
@Test
public void substract() throws Exception {
assertEquals(3d,jcsf.substract(7d,4d),0);
}
@Test
public void divide() throws Exception {
assertEquals(2d,jcsf.divide(4d,2d),0);
}
@Test
public void multiply() throws Exception {
assertEquals(4d,jcsf.multiply(2d,2d),0);
}
}