Shell Programming and Scripting

#!/usr/bin/ksh
set -x
row()
{
a=$1
b=$2
c=$(($a + $b))
d=$(($a * $b))
echo $a $b
}
e=`row 2 3`
set $e
echo "The value of c is $c"
echo "The value of d is $d"

# ./testg.sh
+ + row 2 3
e=2 3
+ set 2 3
+ echo The value of c is
The value of c is
+ echo The value of d is
The value of d is

 
function row
{
a=$1
b=$2
c=$(($a + $b))
d=$(($a * $b))
echo $a $b
}
row 2 3
echo "The value of c is $c"
echo "The value of d is $d"

s=`echo $?`

#!/usr/bin/ksh
row() {
        if [ "$1" -eq 0 ] || [ "$2" -eq 0 ]
        then    return 1
        fi
        a=$1
        b=$2
        c=$(($a + $b))
        d=$(($a * $b))
        # If we get to here, the exit status will be the exit status of the last
        # command above.  As long as the assignment to d succeeded, the exit
        # status of this function will be zero.  You could also explicitly put a
        # return 0 here, but that should not be needed in this case.
}
if row 11 0
then    echo 'row 11 0 succeeded'
        echo "The value of a is $a"
        echo "The value of b is $b"
        echo "The value of c is $c"
        echo "The value of d is $d"
else    echo 'row 11 0 failed'
fi
row 4 5
if [ $? -eq 0 ]
then    echo 'row 4 5 succeeded'
        echo "The value of a is $a"
        echo "The value of b is $b"
        echo "The value of c is $c"
        echo "The value of d is $d"
else    echo 'row 4 5 failed'
fi

row 11 0 failed
row 4 5 succeeded
The value of a is 4
The value of b is 5
The value of c is 9
The value of d is 20