Grade.java added in feature/grade branch

Author: nudar2107041

src/main/java/com/thealgorithms/Grade.java

@@ -0,0 +1,51 @@
+public class Grade {
+    public String getLetterGrade(int score) {
+        if (score < 0 || score > 100) {
+            return "Invalid score";
+        } else if (score >= 80) {
+            return "A";
+        } else if (score >= 70) {
+            return "B";
+        } else if (score >= 50) {
+            return "C";
+        } else if (score >= 30) {
+            return "D";
+        } else {
+            return "F";
+        }
+    }
+
+    public double getGradePoint(int score) {
+        if (score < 0 || score > 100) {
+            return -1;
+        } else if (score >= 80) {
+            return 4.0;
+        } else if (score >= 70) {
+            return 3.0;
+        } else if (score >= 50) {
+            return 2.0;
+        } else if (score >= 30) {
+            return 1.0;
+        } else {
+            return 0.0;
+        }
+    }
+
+    public boolean isPassing(int score) { return score >= 30; }
+
+    public String getRemark(int score) {
+        if (score < 0 || score > 100) {
+            return "Invalid score";
+        } else if (score >= 80) {
+            return "Excellent";
+        } else if (score >= 70) {
+            return "Good";
+        } else if (score >= 50) {
+            return "Average";
+        } else if (score >= 30) {
+            return "Pass";
+        } else {
+            return "Fail";
+        }
+    }
+}