Shulou(Shulou.com)06/03 Report--

#! / bin/bash

Print_usage () {

Printf "please enter an integer\ n"

Exit 5

}

Read-p "please input first number:" firstnum

If [- n "echo $firstnum | sed's / [0-9] / / g'"]; then

Print_usage

Fi

Read-p "please input operators:" operators

If ["${operators}"! = "+"] & & ["${operators}"! = "-"] & & ["${operators}"! = ""] & & ["${operators}"! = "/"]; then

Echo "please input {+ |-| | /}"

Exit 10

Fi

Read-p "please input send number:" secondnum

If [- n "echo $secondnum | sed's / [0-9] / / g'"]; then

Print_usage

Fi

Echo "${firstnum} ${operators} ${secondnum} = $((${firstnum} ${operators} ${secondnum}))"

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