Question

你好，我用 bash 脚本制作了这个程序，我需要计算平均值，我试了很多次，但它不起作用

#!/bin/bash

declare -A grades

for (( c=1 ; c<=5 ; c++))
{
    read -p "enter name,course grade of 5: " course grade
    grades[$course]=$grade
}

echo "your grades is"
echo ${grades[@]}
echo
echo "this is all your courses name and grades"

for  c in ${!grades[*]}
{
    echo " $c   : ${grades[$c]}"
}
unset mygrades

Answer 1

您将需要在循环浏览成绩时创建总成绩，并使用 bc 之类的东西来获得带有小数位的平均值。因此，请使用您的原始代码：

#!/bin/bash

declare -A grades

for (( c=1 ; c<=5 ; c++))
{
  read -p "enter name,course grade of 5: " course grade
  grades[$course]=$grade
}

echo "your grades is"
echo ${grades[@]}
echo
echo "this is all your courses name and grades"

for  c in ${!grades[*]}
{
  echo " $c   : ${grades[$c]}"
  (( cnt++ ))                                                            # Counting elements in the array
  if [[ "$cnt" -ge "(( ${#grades}-5 ))" ]]
  then
     (( total+=${grades[$c]} ))                                          # Get a running total of the grades in index of array is one of the last 5
  fi
}
unset mygrades
av=$(echo "scale=2;$total/5" | bc)                              # Calculate the average using bc, setting the decimal places to 2 by using scale and reading the result into av
echo "Your average grade is $av"

如何在bash中计算平均值？

1 个答案: