mirror of https://github.com/fengyuhetao/shell.git
33 lines
488 B
Bash
33 lines
488 B
Bash
#!/bin/bash
|
|
|
|
# passing parameters to a function
|
|
|
|
function addem {
|
|
if [ $# -eq 0 ] || [ $# -gt 2 ]
|
|
then
|
|
echo -1
|
|
elif [ $# -eq 1 ]
|
|
then
|
|
echo $[ $1 + $1 ]
|
|
else
|
|
echo $[ $1 + $2 ]
|
|
fi
|
|
}
|
|
|
|
echo -n "Adding 10 and 15:"
|
|
value=`addem 10 15`
|
|
echo $value
|
|
|
|
echo -n "Let's try adding just one number: "
|
|
value=`addem 10`
|
|
echo $value
|
|
|
|
echo -n "Now trying adding no number: "
|
|
value=`addem`
|
|
echo $value
|
|
|
|
echo -n "Finally, try adding three or more numbers: "
|
|
value=`addem 10 15 20`
|
|
echo $value
|
|
|