shell script 練習

BMI值計算

#!/bin/bash

read -p "How about your Height(cm)?" height
read -p "How about your Weight(kg)?" weight

echo "your height is $height cm"
echo "your weight is $weight kg"
#because i need chage height's cm to m, and 1m = 100cm
m=100
height=`echo "scale=2; $height / $m"|bc`

BMI=`echo "scale=2; $weight / ($height*$height)" |bc`
echo "---------Result---------"
echo "your bmi is $BMI"

#設定值(set value時)不能有 $ 在前面
#取值(get value)要有 $
#四則運算要使用 expr, +-*/ 左右都要有空白
#不過因為要取到小數點第二位，因此在這裡就不用 expr
#所以不用在乎 expr 使用加減乘除運算的規定(ex: +-*/ 左右要空白)
echo "below 18.5   | 偏瘦"
echo "18.5-24.9    | 標準"
echo "25.0-29.9    | 超重"
echo "30.0 above   | 肥胖"