BAEL-2149 initial commit (#5186)

* BAEL-2149 initial commit

* BAEL-2149 calculate percentage

java-numbers/src/main/java/com/baeldung/percentage/PercentageCalculator.java

@@ -0,0 +1,21 @@
+package com.baeldung.percentage;
+
+import java.util.Scanner;
+
+public class PercentageCalculator {
+
+    public double calculatePercentage(double obtained,double total){
+        return obtained*100/total;
+    }
+
+    public static void main(String[] args) {
+        PercentageCalculator pc = new PercentageCalculator();
+        Scanner in = new Scanner(System.in);
+        System.out.println("Enter obtained marks:");
+        double obtained = in.nextDouble();
+        System.out.println("Enter total marks:");
+         double total =in.nextDouble();
+        System.out.println("Percentage obtained :"+pc.calculatePercentage(obtained,total));
+    }
+
+}

java-numbers/src/test/java/com/baeldung/percentage/PercentageCalculatorUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.percentage;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class PercentageCalculatorUnitTest {
+    private PercentageCalculator pc = new PercentageCalculator();
+
+    @Test
+    public void whenPass2Integers_thenShouldCalculatePercentage(){
+        Assert.assertEquals("Result not as expected",
+                50.0,pc.calculatePercentage(50,100),0.1);
+    }
+
+    @Test
+    public void whenPassObtainedMarksAsDouble_thenShouldCalculatePercentage(){
+        Assert.assertEquals("Result not as expected",5.05,
+                pc.calculatePercentage(50.5,1000),0.1);
+    }
+
+    @Test
+    public void whenPassTotalMarksAsDouble_thenShouldCalculatePercentage(){
+        Assert.assertEquals("Result not as expected",19.6,
+                pc.calculatePercentage(5,25.5),0.1);
+    }
+
+    @Test
+    public void whenPass2DoubleNumbers_thenShouldCalculatePercentage(){
+        Assert.assertEquals("Result not as expected",20,
+                pc.calculatePercentage(5.5,27.5),0.1);
+    }
+
+}