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Homework and Emergencies Homework & Coursework Questions Problem with calculator script
# 8  
Old 12-09-2010
Ok. So u just want to input 2 numbers and want to perform all operations user has asked to. This is also simple. U have the count of arguments. Run a for loop and check whether only 2 arguments are numbers. See below.

Code:
count=0
for arg in `echo "$@"`
do
    echo "$arg" | egrep "^[+-]*[0-9][0-9]*$"
    if [ $? -eq 0 ] ; then
        (( $count += 1 ))
    else
        echo "$arg" | egrep "^[+-][asdm]$"
        if [ $? -gt 0 ] ; then ; display_usage ; exit ; fi
    fi

    if [ $count -gt 2 ] ; then ; display_usage ; exit ; fi
done

This will solve all the problems...Smilie
R0H0N
# 9  
Old 12-09-2010
Quote:
Originally Posted by R0H0N
Ok. So u just want to input 2 numbers and want to perform all operations user has asked to. This is also simple. U have the count of arguments. Run a for loop and check whether only 2 arguments are numbers. See below.

Code:
count=0
for arg in `echo "$@"`
do
    echo "$arg" | egrep "^[+-]*[0-9][0-9]*$"
    if [ $? -eq 0 ] ; then
        (( $count += 1 ))
    else
        echo "$arg" | egrep "^[+-][asdm]$"
        if [ $? -gt 0 ] ; then ; display_usage ; exit ; fi
    fi

    if [ $count -gt 2 ] ; then ; display_usage ; exit ; fi
done

This will solve all the problems...Smilie
That's a really good idea, the logic definitely solves part of my problem, but for some reason I'm getting errors.

Code:
zak 153 % mymath.sh 7 7 -a
7
mymath.sh: line 52: ((: 0 += 1 : attempted assignment to non-variable (error token is "+= 1 ")
7
mymath.sh: line 52: ((: 0 += 1 : attempted assignment to non-variable (error token is "+= 1 ")
-a

# 10  
Old 12-09-2010
Oh sorry. $ should not be there.

Code:
(( count += 1 ))

R0H0N
# 11  
Old 12-09-2010
Quote:
Originally Posted by R0H0N
Oh sorry. $ should not be there.

Code:
(( count += 1 ))

Use the portable POSIX syntax:
Code:
count=$(( $count + 1 ))

# 12  
Old 12-09-2010
Thanks. That takes care of some of it. The other problem is the input order. The getops is fantastic for taking in one argument, but only if they are after a switch.
# 13  
Old 12-09-2010
Quote:
Originally Posted by zkapopou
Thanks. That takes care of some of it. The other problem is the input order. The getops is fantastic for taking in one argument, but only if they are after a switch.

For this, I would suggest u to develop your script in such a way that it accepts options first and than two numbers at last.

For example:

Code:
mymath.sh 7 7 -a        # Invalid
mymath.sh -a -m 7 7   # Valid
mymath.sh -a 7 -m 7 -s   # Invalid

So, build a logic which accepts two numbers followed by all valid options as command line arguments.
R0H0N
# 14  
Old 12-09-2010
Did you ever get options and arguments interspersed properly? If so, how did you go about that?
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