#!/bin/bash
# Bash shell script to calculate student average
# Usage: ./grade1.sh    

# Declare some integer type variables
echo -n "Do you wish to enter another set of scores? (y/n) "
read CHOICE
while [ "$CHOICE" != "n" ]
do
	
declare -i test1
declare -i test2
declare -i test3
declare -i test4
declare -i lab
declare -i sum

    echo
    echo "=================="
    echo "Grade Calculator  "
    echo "=================="
    echo
    read -p "Enter first name: " firstname
    read -p "Enter last name: " lastname
    echo
    read -p "Enter test score 1: " test1
    read -p "Enter test score 2: " test2
    read -p "Enter test score 3: " test3
    read -p "Enter test score 4: " test4
    read -p "Enter lab score: " lab

    sum=$test1+$test2+$test3+$test4+$lab
    average=$((sum/5))

    if [ $average -ge 90 ]; then
        grade="A";
    elif [ $average -ge 80 ]; then
        grade="B";
    elif [ $average -ge 70 ]; then
        grade="C";
    elif [ $average -ge 60 ]; then
        grade="D"
    elif [ $average -le 60 ]; then
        grade="F"
    fi
    echo "Course Grade: "$grade
    echo
    echo "Grade results . . ."
    echo "Student name: $firstname $lastname"
    echo "Total points: $sum"
    echo "Course average: $average"
    echo

    case $grade in
    A) echo "An 'A' represents superior course work."
        ;;
    B) echo "A 'B' represents above average course work."
        ;;
    C) echo "A 'C' represents average course work."
        ;;
    D) echo "A 'D' represents below average course work."
        ;;
    F) echo "An 'F' represents failing course work."
        ;;
    esac
done