PLEASE WRITE IN C$++$ LANGUAGE

$6\mathrm{.}1$

Write a program that displays a message for a letter grade.

Ask user for a letter grade and display a message similar to table below.

A or a $$ Excellent

B or b $$ Good Job

C or c $$ Passing

D or $d$ Work harder

F or $f$ Failing

anything else $->$ Wrong letter

Note: Use switch for this program. User can input an uppercase or lowercase character.

$6\mathrm{.}2$

Write a program to modify a string entered by user.

Ask user for one string that includes both first name and last name separated by one space character.

The program displays the information similar to sample below:

Sample Dialogue:

Enter your name: Jack Black

Name in proper format: Black, Jack

Before submitting, check for following:

$-5$ lines of comments

$-$Code lineup

$-$Indentation

$-$meaningful names for variables

$-$description to user

$-$add comments