linxu shell 递归和while循环 的 factorial计算

linxu shell 递归和while循环 的 factorial计算

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1 #!/bin/bash
2 read -p "Enter a number: " num
3 result=$num
4 while [ $num -gt 1 ]
5 do
6     num=$[ $num - 1 ]
7     result=$[ $result * $num ]
8 done
9 echo "The result is $result"

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 1 #!/bin/bash
 2 function factorial {
 3     if [ $1 -le 0 ];then
 4         echo 1
 5     else
 6         local temp=$[ $1 -1 ]
 7         local result=`factorial $temp`
 8         echo $[ $result * $1 ]
 9     fi
10 }
11 read -p "请输入要计算的数字: " num
12 result=`factorial $num`
13 echo -e "结果为$result\n"