Question

因此，当用户输入像4750这样的4位数字时，程序必须转换该两位小数，而不是将该数字转换为47.50美元。这将存储在cost_in_cents中。这是我到目前为止只是计算的代码。消息已经在不同的函数上打印了，我只需要帮助编码带有十进制数的计算。

#!/usr/bin/env bash
 Percent=20
 Numguests=DO_NOT_CHANGE     # number of elements in ${GUESTS}
 Limit=DO_NOT_CHANGE          # $num_guests * $BUDGET_PER_PERSON
 Cost=DO_NOT_CHANGE           # prompt user
 Tip=DO_NOT_CHANGE            # $cost * $percent%
 Totalcost=DO_NOT_CHANGE      # $cost + $tip
 Averagecost=DO_NOT_CHANGE   # $overall_cost / $num_guests

function calc {
echo -n "What is the total cost in cents (not including tip)? ";
read cost_in_cents 
Numguests=8
Limit=$((8 * 25))
Cost=$cost_in_cents  #needs to convert into decimal
Tip=$(($Cost * $Percent)) #needs to be in decimal
Overall_cost=$(($Cost + $Tip)) #needs to have decimal
Average_cost=$(($Totalcost /8)) #needs to be in decimal
}

如何将cost_in_cents转换为小数点后两位（如果数字为4315，则将其转换为$ 43.15或如果数字为50则实际为$ 0.50）并将其相乘而不将其四舍五入

Answer 1

你可以在bc中做数学，但即使在awk中也是如此：

$ cost="3444"
$ cost2=$(awk '{print $0/100}' <<<"$cost")
$ echo "$cost ==> $cost2"
3444 ==> 34.44

Answer 2

您可以直接在awk中执行此操作和许多其他计算。这是一个例子......

value=4315; cost=$(awk "BEGIN{print $value/100}"); echo $cost

43.15

如果要控制十进制数更改为printf \"%.2f\n\", $value/100

DECIMAL POINTS和带小数的乘法

2 个答案: