package com.github.miniyk2012.coding2017.basic.stack.expr;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class InfixExprTest {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void testEvaluate() {
//InfixExpr expr = new InfixExpr("300*20+12*5-20/4");
{
InfixExpr expr = new InfixExpr("2");
Assert.assertEquals(2.0, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("2+3");
Assert.assertEquals(5.0, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("2+3*4+5");
Assert.assertEquals(19.0, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("3*20+12*5-40/2");
Assert.assertEquals(100.0, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("3*20/2");
Assert.assertEquals(30, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("20/2*3");
Assert.assertEquals(30, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("10-30+50");
Assert.assertEquals(30, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("10-30+50-20/10/2*4");
Assert.assertEquals(26, expr.evaluate(), 0.001f);
}
{
InfixExpr expr = new InfixExpr("10-30+50-20/1+10");
Assert.assertEquals(20, expr.evaluate(), 0.001f);
}
}
}