要求:使用while循环编写脚本，使其完成以下功能：
1.提示用户输入两个整数:firstNum和secondNum(firstNum的值一定要小于secondNum)
2.输出所有介于这两数之间的奇数
3.输出所有介于这两数目之间偶数之和
先看一下如何用for循环实现:
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#!/bin/bash#chapter_8-14echo "Please input two integer numbers(the first must be smaller than the second):"
read firstNum secondNum
#定义函数fun0，判断输入的两个数的大小fun0(){ while [ $1 -lt $2 ]
do
echo "Your input:" "$firstNum ""$secondNum"
break
done
}fun0 $firstNum $secondNum#定义一个数组，将两个数之间的所有数写入数组declare -a arr1
i=firstNumarr1=($(for ((i=firstNum;i<=secondNum;i++))
do echo -n "$i "
done))length=${#arr1[@]}
sum_even=0if [[ "arr1[0]%2" -eq 0 ]]
then for ((j=0;j<=length;j=j+2))
do
let sum_even+=arr1[j]
echo -n "${arr1[j+1]} "
done
echo "偶数之和为:" $sum_even
else for ((k=0;k<=length;k=k+2))
do
let sum_even+=arr1[k+1]
echo -n "${arr1[k]} "
done
echo "偶数之和为:" "$sum_even "
fi |
脚本执行效果:
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[root@localhost charpter8]# sh 8-14
Please input two integer numbers(the first must be smaller than the second):3 29Your input: 3 293 5 7 9 11 13 15 17 19 21 23 25 27 29 偶数之和为: 208[root@localhost charpter8]# sh 8-14
Please input two integer numbers(the first must be smaller than the second):8 29Your input: 8 299 11 13 15 17 19 21 23 25 27 29 偶数之和为: 198 |
while 循环实现:
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#!/bin/bashecho "Pleas input two integer number(the first num must be smaller than the second one):"
read firstNum secondNum
fun0(){ while [ $1 -lt $2 ]
do
echo "Your input is:" "$firstNum " "$secondNum"
break
done
}fun0 $firstNum $secondNumdeclare -a arr1
let i=firstNum
arr1=( $(
while ((i<=secondNum))
do
echo "$i "
let i++
done
)
)length=${#arr1[@]}
j=0k=0sum_even=0if [[ "arr1[0]%2" -eq 0 ]]
then while ((j<length))
do
echo -n "${arr1[j+1]} "
let sum_even+=arr1[j]
let j=j+2
done
echo "偶数之和:$sum_even"
else while ((k<length))
do
echo -n "${arr1[k]} "
let sum_even+=arr1[k+1]
let k=k+2
done
echo "偶数之和:$sum_even"
fi |
脚本执行效果:
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root@localhost charpter8]# sh 8-14-1
Pleas input two integer number(the first num must be smaller than the second one):31 38Your input is: 31 3831 33 35 37 偶数之和:140[root@localhost charpter8]# sh 8-14-1
Pleas input two integer number(the first num must be smaller than the second one):30 39Your input is: 30 3931 33 35 37 39 偶数之和:170 |
两种循环实现发现大致相似.
本文转自 marbury 51CTO博客，原文链接:http://blog.51cto.com/magic3/1429193