函数_实例2_计算器

#!/bin/bash

compute()
{
        if [ $# != 3 ];then
                echo "Your input num is not enough!"
        fi

        let "s=0"
        case $2 in
                +)
                        let "s=$1+$3"
                        echo "answer is: $s"
                        ;;
                -)
                        let "s=$1-$3"
                        echo "answer is: $s"
                        ;;
                \*)
                        let "s=$1*$3"
                        echo "answer is: $s"
                        ;;
                \/)
                        let "s=$1%$3"
                        echo "answer is: $s"
                        ;;
                *)
                        echo "your input is wrong!"
                        ;;
        esac
}

echo  "Pls,input like this: 2 + 3"
echo ""
read a b c
compute $a $b $c

[[email protected] test]# ./fun3.sh 2 + 3
Pls,input like this: 2 + 3

3 + 3
answer is: 6

函数_实例2_计算器