package com.coding.week6.expr;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
/**
* Created by Administrator on 2017/4/16 0016.
*/
public class InfixExprTestTest {
@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+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);
}
}
@Test
public void testFillStack() {
InfixExpr expr = new InfixExpr("10-30+50");
expr.fillStack();
Assert.assertEquals(expr.printNumberStack(), "50.0,-20.0");
Assert.assertEquals(expr.printOperatorStack(), "+");
expr = new InfixExpr("3*20+12*5-40/2");
expr.fillStack();
Assert.assertEquals(expr.printNumberStack(), "2.0,40.0,60.0,60.0");
Assert.assertEquals(expr.printOperatorStack(), "/,-,+");
expr = new InfixExpr("3*20/2");
expr.fillStack();
Assert.assertEquals(expr.printNumberStack(), "2.0,60.0");
Assert.assertEquals(expr.printOperatorStack(), "/");
expr = new InfixExpr("20/2*3");
expr.fillStack();
Assert.assertEquals(expr.printNumberStack(), "3.0,10.0");
Assert.assertEquals(expr.printOperatorStack(), "*");
expr = new InfixExpr("10-30+50");
expr.fillStack();
Assert.assertEquals(expr.printNumberStack(), "50.0,-20.0");
Assert.assertEquals(expr.printOperatorStack(), "+");
}
}