IN SIMPLE C++ language, write the code for these two questions.

(3) // Author: // Creation Date: // Last Modification Date: // Purpose: Returns the letter grade using the following: // >=90 A // <90 and>=80 B // <80 and>= 70 C // <70 and>= 60 D // <60 and>= 50 E // <50 f string calculatelettergrade (float pointgrade) {>