shell计算工具源码
#!/bin/bash#定义最大公约数和最小公约数
GCD_RESULT=""
LCM_RESULT=""
#定义一个相加的函数
function sum() {
result=$(( num1+num2 ))
echo -e "\033[31m 两个数之和为$result \033[0m"
}
#定义一个求最大公约数函数
function divisor() {
if [ "$num1" -eq "$num2" ];
then
s_great=$num1
s_small=$num2
#export s_great
#export s_small
fi
if [ "$num1" -gt "$num2" ];
then
s_great=$num1
s_small=$num2
else
s_great=$num2
s_small=$num1
fi
i=1
GCD_RESULT=1
greattmp=1
smalltmp=1
LCM_RESULT=1
export GCD_RESULT
while [ $i -le "$s_small" ]
do
greattmp=`expr $s_great % $i`
smalltmp=`expr $s_small % $i`
if [ ${greattmp} -eq 0 ]; then
if [ ${smalltmp} -eq 0 ]; then
GCD_RESULT=${i}
fi
fi
i=`expr ${i} + 1`
done
LCM_RESULT=`expr $s_small / $GCD_RESULT`
LCM_RESULT=`expr $LCM_RESULT \* $s_great`
#echo -e "\033[31m 两个数最大公约数为$s_great \033[0m"
}
function say() {
divisor
echo -e "\033[31m 两个数最大公约数为$GCD_RESULT \033[0m"
}
#定义一个求最小公倍数函数
function multiple() {
divisor
echo -e "\033[31m 两个数最小公倍数为$LCM_RESULT \033[0m"
}
function main() {
echo "---------------------------"
echo "请输入你要执行的方法"
echo "输入1:执行相加函数，返回两数之和"
echo "输入2:执行最大公约数函数，返回两数最大公约数"
echo "输入3:执行最小公倍数函数，返回两数最小公倍数"
echo "输入4:退出"
read input
case $input in
1)
sum;;
2)
say;;
3)
multiple;;
4)
exit;;
esac
}
if [ $# != 2 ];then
echo "命令格式不对, 命令格式:sh d.sh num1 num2"
exit
fi
#根据返回的状态判断输入是否为数字
num=`expr $1 + 0 &>/dev/null`
if [ $? -ne 0 ];then
echo "num1 必须是数字格式"
exit
fi
num=`expr $2 + 0 &>/dev/null`
if [ $? -ne 0 ];then
echo "num2 必须是数字格式"
fi
#显示选择菜单
while true
do
num1=$1
num2=$2
main
done
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