#! /bin/bash
#!$Grades.sh
chmod 755

echo -e "\My Grade Grade Calculator at [`date`]"

echo -e "\Please enter number grades for the students on one line like"
echo -e "\n65 85 99 100\n"

declare -i stunum=1 n1 n2 n3 n4 sum avg N slimit


echo -ne "\nNumber of students : "
read N

read- p  ?Enter Grade: ?Grade
if [[ $SGrade = "A" ||$Grade -le 100 && $Grade -ge 90 ]] then read -p "Enter A Grade" myvar fi

if [[ $SGrade = "D" || $Grade -le 69 && $Grade -ge 65 ]] then read -p "Enter D Grade" myvar fi

if [[ $SGrade = "C" || $Grade -le 79 && $Grade -ge 70 ]] then read -p "Enter C Grade" myvar fi

if [[ $SGrade = "B" || $Grade -le 89 && $Grade -ge 80 ]] then read -p "Enter B Grade" myvar fi


# Compute grades for N students, the slimit in while condition
# below should be (N+1).


slimit=N+1

while [ $stunum -lt $slimit ]
do
	echo -ne "Student #$stunum : "

	# Read the four number grades.
	read n1 n2 n3 n4

	# Compute the average of input number grades.
	sum=n1+n2+n3+n4
	avg=sum/4

	echo -n "Average = $avg, Grade ="

	# Compute the corresponding letter grade now.
	if [ $avg -lt 65 ]
	then
		echo -e " C\n"
	elif [ $avg -lt 70 ]
	then
		echo -e " B\n"
	elif [ $avg -lt 80 ]
	then
		echo -e "A\n"
	elif [ $avg -lt 90 ]
	then
		echo -e " B\n"
	else
		echo -e " A\n"
	fi

	# Increment the student number.
	stunum=stunum+1