InfixExprTest.java

package com.coding.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+3*4+5");
			Assert.assertEquals(19.0, expr.evaluate(), 0.001f);
		}
		{
			InfixExpr expr = new InfixExpr("5-2+3");
			Assert.assertEquals(6.0, 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(" 5-2-2+3");//5+3-2-2
			Assert.assertEquals(4, expr.evaluate(), 0.001f);
		}
		{
			InfixExpr expr = new InfixExpr("75/3/5*5"); //75*5/3/5  0.6
			Assert.assertEquals(25.0, expr.evaluate(), 0.001f);
		}
		
	}

}