# Error handling if the argument list is empty or contains string instead of integers.

if [ $# = 0 ]
then
        echo "Usage $0 -integer-list"
        exit 1
elif [ $@ = [^9-0] ]
then
        echo "No Strings are allowed."
fi

#!/bin/sh
# File:                         power
# Author:                      
# Student ID:                   
# Created:                      6/23/2012
# Purpose:                      
# Description:                  This program uses the integer list provides
#                               as command arguments and evaluates the square 
#                               numbers of all of them. At the end of the 
#                               script the sum of all the squared numbers is 
#                               printed to the screen
#
#
#
#


# Error handling if the argument list is empty or contains string instead of integers.

if [ $# = 0 ]
then
        echo "Usage $0 -integer-list"
        exit 1
elif [ $@ = [^9-0] ]
then
        echo "No Strings are allowed."
fi

total=0
power=0

# Function used for summation of the squared number list.
sum()
{
        total=`expr $total + $power`    # Sum the total value.
}

# Iterates through the argument list.
for num in $@
do
        power=`expr $num \* $num`               # Evaluate the square for the current argument.
        echo "$num squared equals $power"       # Print to screen the square of the argument.
        sum             # Call the sum function to sum the square values togehter.      
done

# Prints the result of the sum function
echo "Total of squared numbers = $total"