shell运算实战案例-KFC点餐系统
写一个KFC餐厅点餐程序
案例需求
写一个程序,模拟KFC点餐系统,要求有以下功能:
- 1、点餐功能
- 2、结算功能
- 3、打印流水单
案例步骤
- 1、交互点餐
- 2、结账收银
- 3、打印流水单给客户
案例代码
#!/bin/bash
#
#Author:www.zutuanxue.com
#
#Release:
#Description: #1)录入单价
HBB=19.8
JC=12.3
KL=9.9#2)定义输出
cat <<EOFwelcome to KFC
今天KFC提供菜品如下:1)汉堡2)鸡翅3)可乐
EOFecho -e "\n请您输入希望购买菜品的数量,不需要输入0\n"
###1.用户交互
#定义变量类型为整形
declare -i NUM_HBB
declare -i NUM_JC
declare -i NUM_KLread -p "汉堡: " NUM_HBB
read -p "鸡翅: " NUM_JC
read -p "可乐: " NUM_KL###2.计算输出
HBB_price=`echo "scale=2;$HBB*$NUM_HBB"|bc`
JC_price=`echo "scale=2;$JC*$NUM_JC"|bc`
KL_price=`echo "scale=2;$KL*$NUM_KL"|bc`
total_price=`echo "scale=2;$HBB_price+$JC_price+$KL_price"|bc`###3.付款
echo -n "合计: $total_price "
read -p "请付款: " USER_price###4.打印小票
clear
echo -e "\t\tKFC结算单"
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
echo -e "商品\t单价\t数量\t合计"
echo -e "汉堡包\t$HBB\t$NUM_HBB\t$HBB_price"
echo -e "鸡翅\t$JC\t$NUM_JC\t$JC_price"
echo -e "可乐\t$KL\t$NUM_KL\t$KL_price"
echo -e "\n\n"
echo "总计: $total_price"
echo -e "支付:$USER_price"
echo -e "找零: `echo "scale=2;$USER_price-$total_price"|bc`"
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
echo -e "地址:北京东大桥路33号KFC店\n联系电话:400-123-456\nwww.kfc.com"
案例效果