Add ch4 e15

Author: Shehab Abdel-Salam

chapters/chapter04_control_flow/exercises/exercise_ch4_14.py

@@ -1,4 +1,4 @@
-# Exercise 04_13 - Reverse Digits
+# Exercise 04_14 - Reverse Digits
 # Write a program that takes an integer as input and returns the integer with its digits reversed.
 # For example, given the integer 123, the function should return 321.
 

chapters/chapter04_control_flow/exercises/exercise_ch4_15.py

@@ -0,0 +1,10 @@
+# Exercise 04_15 - GPA Calculator
+# Write a program that calculates the GPA of a student.
+# The program should take in the grades of the courses and return the GPA of the student.
+# For example, given the grades [4, 3, 2], the function should return 3.0.
+
+
+def gpa_calculator(grades):
+    # Your code should go here.
+
+    return ...

chapters/chapter04_control_flow/tests/test_ch04.py

@@ -12,6 +12,7 @@
 from ..exercises.exercise_ch4_12 import find_first_divisible_by_5
 from ..exercises.exercise_ch4_13 import sum_positive_numbers
 from ..exercises.exercise_ch4_14 import reverse_digits
+from ..exercises.exercise_ch4_15 import gpa_calculator
 
 
 def test_ch04_e01():
@@ -107,3 +108,12 @@ def test_ch04_e14():
     assert reverse_digits(456) == 654
     assert reverse_digits(789) == 987
     assert reverse_digits(101) == 101
+
+
+def test_ch04_e15():
+    assert gpa_calculator([]) == 0
+    assert gpa_calculator([4, 3, 2]) == 3.0
+    assert gpa_calculator([4, 3, 2, 1]) == 2.5
+    assert gpa_calculator([4, 4, 4, 4]) == 4.0
+    assert gpa_calculator([3, 3, 3, 3]) == 3.0
+    assert gpa_calculator([3.2, 3.5, 3.8, 4]) == 3.625