计算1.5加班工资命中无效算术运算符错误

Question

我正在尝试为员工计算1.5加班费，但语法错误“无效算术运算符”。我是否需要指示任何特殊的十进制计算命令？ 感谢。

错误：

Enter employee name: Mary
Mary is Hourly employee.
Enter hourly wage:1
Enter hours worked this week:42
./Assignment2.sh: line 196: let: hwages = (40 * hsalary) + (overtime * 1.5 * hsalary): syntax error: invalid arithmetic operator (error token is ".5 * hsalary)")
Gross wages: $
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我的代码：

   elif [ "$EmployeeType" = "Hourly" ]
   then
    echo -en "Enter hourly wage:"
    read hsalary
    echo -en "Enter hours worked this week:"
    read hours
    if [ "$hours" > 40 ]
    then
    let "overtime = hours - 40"
    let "hwages = (40 * hsalary) + (overtime * 1.5 * hsalary)"
    else
    let "hwages = hsalary * hours"
    fi
    echo -en "Gross wages: \$$hwages"
    echo 

Answer 1

BASH仅支持整数运算，不支持浮点运算。使用bc -l或awk

示例：

bc -l <<< "1.5 * 20"
30.0