writting a script with a IF statement (Programming)

akounga · 06-12-2009, 06:09 PM

Hi all,

Can somebody help me; i'm trying to write a script with the IF statement which reads 5 grades, calculates and displays the lowest, highest and the final letter grade;
I've written the IF statement which reads 5 grades.
My problem is to write the script which will calculate and display the lowest, highest and the final letter grade.
This's what i've written so far:

gradeA=90
gradeB=80
gradeC=70
gradeD=60
gradeF=59

read -p "gradeA: " gradeA
read -p "gradeB: " gradeB
read -p "gradeC: " gradeC
read -p "gradeD: " gradeD
read -p "gradeF: " gradeF

if [[ $gradeA -ge 90 && $gradeA -lt 101 ]]
then
echo "gradeA"
else
echo "invalid"
fi

if [[ $gradeB -ge 80 && $gradeB -lt 90 ]]
then
echo "gradeB"
else
echo "invalid"
fi

if [[ $gradeC -ge 70 && $gradeC -lt 80 ]]
then
echo "gradeC"
else
echo "invalid"
fi

if [[ $gradeD -ge 60 && $gradeD -lt 70 ]]
then
echo "gradeD"
else
echo "invalid"
fi

if [[ $gradeF -ge 59 && $gradeF -lt 60 ]]
then
echo "gradeF"
else
echo "invalid"
fi

vonbiber · 06-13-2009, 03:08 AM

Quote:

Originally Posted by akounga

Hi all,

Can somebody help me; i'm trying to write a script with the IF statement which reads 5 grades, calculates and displays the lowest, highest and the final letter grade;
I've written the IF statement which reads 5 grades.
My problem is to write the script which will calculate and display the lowest, highest and the final letter grade.
This's what i've written so far:

gradeA=90
gradeB=80
gradeC=70
gradeD=60
gradeF=59

...
fi

after you've read gradeA, ..., gradeF
...

here's what you can do to get the lowest and highest
grade among $gradeA, ..., $gradeF

# print lowest, highest grade

lowest=$gradeA
highest=$gradeA

for grade in $gradeA $gradeB $gradeC $gradeD $gradeF
do
if [ $lowest -gt $grade ]; then
lowest=$grade
fi
if [ $highest -lt $grade ]; then
highest=$grade
fi
done

echo "highest grade: $highest"
echo "lowest grade: $lowest"
echo "out of these grades: $gradeA, $gradeB, $gradeC, $gradeD, $gradeF"

bigearsbilly · 06-13-2009, 03:38 AM

homework?

use a case instead.

Disillusionist · 06-13-2009, 08:47 AM

Code:

#!/bin/bash

f_grade() {
# Function to make looping through the grading process simpler
   l_grade=$1

   if [[ $l_grade -ge 0 && $l_grade -lt 101 ]]
   then
   # grade is valid!
      if [[ $l_grade -ge 90 ]]
      then
         echo "Grade A: $l_grade"
      elif [[ $l_grade -ge 80 ]]
      then
         echo "Grade B: $l_grade"
      else
         echo "Below B: $l_grade"
      fi
   else
      echo "Invalid grade: $l_grade!"
   fi
}

# Get grades from input
read -p "Please enter your grades: " g1 g2 g3 g4 g5

highest=$(echo "$g1
$g2
$g3
$g4
$g5"|sort -rn|head 1)

echo "Highest: $highest"
f_grade $highest

echo "out of:  $g1 $g2 $g3 $g4 $g5"

f_grade $g1
f_grade $g2
f_grade $g3
f_grade $g4
f_grade $g5

akounga · 06-14-2009, 03:55 PM

Hi all,

Thanks to everybody who have responded to my question;