Himeji IT Study Vol.11 L-1 GP 2.GPA(Grade Point Average)

gpa.sh

#!/bin/bash

N=$(head -n1 $1)
S=$(tail -n1 $1)

A=$(echo ${S}|tr -d [BCDF])
B=$(echo ${S}|tr -d [ACDF])
C=$(echo ${S}|tr -d [ABDF])
D=$(echo ${S}|tr -d [ABCF])
F=$(echo ${S}|tr -d [ABCD])

# echo $(((${#A}*4+${#B}*3+${#C}*2+${#D})/${N})) # sadly...
echo "scale=5;(${#A}*4+${#B}*3+${#C}*2+${#D})/${N}" | bc