Very Computer

I have (to practice awk programming) to create a simple calculator
with awk
here is my code:

command : echo "34 * 2" | bc-l.sh

script :
read a
echo $a | awk '
{

    { if($2=="+") { sum = $1+=$3; print  sum;} }
    { if($2=="-") { sum = $1-=$3; print  sum;} }
    { if($2=="/") { sum = $1/=$3; print  sum;} }
    { if($2=="*") { sum = $1*=$3; print  sum;} }

Quote:}'

It works well except with multiplication. The * character seems to be
interpreted like "joker" not "multiplication" How could I fix it?

Thank You

[snip]

Quote:>It works well except with multiplication. The * character seems to be
>interpreted like "joker" not "multiplication" How could I fix it?

This is due to shell globbing.

You need to tell the shell to treat the '*' character as an ordinary
character instead of as a wildcard.  How to do this depends on the shell
you're using.

Check the man pages for your particular shell.
--

Quote:> I have (to practice awk programming) to create a simple calculator
> with awk
> here is my code:

> command : echo "34 * 2" | bc-l.sh

> script :
> read a
> echo $a | awk '
> {

>     { if($2=="+") { sum = $1+=$3; print  sum;} }
>     { if($2=="-") { sum = $1-=$3; print  sum;} }
>     { if($2=="/") { sum = $1/=$3; print  sum;} }
>     { if($2=="*") { sum = $1*=$3; print  sum;} }
> }'

> It works well except with multiplication. The * character seems to be
> interpreted like "joker" not "multiplication" How could I fix it?

Quote the variable so * isn't expanded.
Ben

I quoted the $a instead and it works.

------- Sample Output -------

Script started on Mon May  6 12:48:53 2002
[ /students/btam01/tmp ]
cat calc

read a
echo "$a" | awk '
{
    { if ( $2 == "+" ) { sum = $1 + $3; print sum;} }
    { if ( $2 == "-" ) { sum = $1 - $3; print sum;} }
    { if ( $2 == "/" ) { sum = $1 / $3; print sum;} }
    { if ( $2 == "*" ) { sum = $1 * $3; print sum;} }

Quote:}'

[ /students/btam01/tmp ]
echo "3 * 3" | calc
9
[ /students/btam01/tmp ]

script done on Mon May  6 12:49:09 2002

-Bill

Quote:>I have (to practice awk programming) to create a simple calculator
>with awk

i would be tempted to use:

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bringing you boring signatures for 17 years

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bringing you boring signatures for 17 years