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_8-14
echo
"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 $secondNum
#定义一个数组，将两个数之间的所有数写入数组
declare
-a arr1
i=firstNum
arr1=($(
for
((i=firstNum;i<=secondNum;i++))
do
echo
-n
"$i "
done
))
length=${
#arr1[@]}
sum_even=0
if
[[
"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
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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 29
Your input: 3 29
3 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 29
Your input: 8 29
9 11 13 15 17 19 21 23 25 27 29 偶数之和为: 198
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while 循环实现:
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#!/bin/bash
echo
"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 $secondNum
declare
-a arr1
let
i=firstNum
arr1=(
$(
while
((i<=secondNum))
do
echo
"$i "
let
i++
done
)
)
length=${
#arr1[@]}
j=0
k=0
sum_even=0
if
[[
"arr1[0]%2"
-
eq
0 ]]
then
while
((j<length))
do
echo
-n
"${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
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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 38
Your input is: 31 38
31 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 39
Your input is: 30 39
31 33 35 37 39 偶数之和:170
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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
