标签：null
1.read读取方式： [root@www scripts]# vim read_1.sh 1 #!/bin/bash 2 # Filename: read_1.sh 3 # Describe: Integer arithmetic 4 # Author: Lijun 5 # Date: 2015-08-24 6 # Version: 1.0.1 7 8 read -p "Please input two nums: " a b 9 10 if [ -z $a ] || [ -z $b ] 11 then 12 echo "Please input two nums again." 13 exit 1 14 fi 15 16 expr $a + 1 > /dev/null 2>&1 17 RETVAL1=$? 18 expr $b + 1 > /dev/null 2>&1 19 RETVAL2=$? 20 21 if [ $RETVAL1 -ne 0 ] || [ $RETVAL2 -ne 0 ] 22 then 23 echo "Please input two nums(must be integer)." 24 exit 2 25 else 26 echo "a+b=$(( $a + $b ))" 27 echo "a-b=$(( $a - $b ))" 28 echo "a*b=$(( $a * $b ))" 29 echo "a/b=$(( $a / $b ))" 30 echo "a%b=$(( $a % $b ))" 31 exit 0 32 fi
2.脚本传参的方式：
[root@www scripts]# vim read_2.sh
1 #!/bin/bash
2 # Filename: read_2.sh
3 # Describe: Integer arithmetic
4 # Author: Lijun
5 # Date: 2015-08-24
6 # Version: 1.0.2
7
8 a=$1
9 b=$2
10
11 if [ $# -ne 2 ]
12 then
13 echo "Usage: sh `basename $0` {NUM1 NUM2}"
14 exit 1
15 fi
16
17 expr $a + 1 > /dev/null 2>&1
18 RETVAL1=$?
19 expr $b + 1 > /dev/null 2>&1
20 RETVAL2=$?
21
22 if [ $RETVAL1 -ne 0 ] || [ $RETVAL2 -ne 0 ]
23 then
24 echo "Please input two integers(must be integer)."
25 exit 2
26 else
27 echo "a+b=$(( $a + $b ))"
28 echo "a-b=$(( $a - $b ))"
29 echo "a*b=$(( $a * $b ))"
30 echo "a/b=$(( $a / $b ))"
31 echo "a%b=$(( $a % $b ))"
32 exit 0
33 fi
3. 整数判断的另一种方法：
[root@www scripts]# vim read_3.sh
1 #!/bin/bash
2 # Filename: read_1.sh
3 # Describe: Integer arithmetic
4 # Author: Lijun
5 # Date: 2015-08-24
6 # Version: 1.0.1
7
8 read -p "Please input two nums: " a b
9
10 if [ -z $a ] || [ -z $b ]
11 then
12 echo "Please input two nums again."
13 exit 1
14 fi
15
16 echo $a |egrep -o "[^0-9]{1,}" > /dev/null || echo $b |egrep -o "[^0-9]{1,}" > /dev/null && 17 echo "Please input two nums(must be integer)."|| {
18 echo "a+b=$(( $a + $b ))"
19 echo "a-b=$(( $a - $b ))"
20 echo "a*b=$(( $a * $b ))"
21 echo "a/b=$(( $a / $b ))"
22 echo "a%b=$(( $a % $b ))"
23 }shell编程实例---实现整数的加减乘除余运算（利用read和脚本传参的方式）
标签：null
原文地址：http://l19891223j.blog.51cto.com/888280/1687989
