11-30-2010
Arithmetic Problem with shell script programming.
Hello everybody,
I decided to take a Unix Introduction class and have never had experience with programming. Everything was fine until recently when the Prof. started shell scripting and he wants us to make a small script to add unlimited numbers from arguments and from standard input.
I admit I am really bad at understanding his teaching, for one. He teaches this class as you had previous experience with programming and when i ask him questions he is very evasive with his answers. My problem is that he didn't have a lecture about flowcharts and i don't understand how to make it work for unlimited numbers introduced.
I was able to make a small script that can add 5 numbers from arg and 5 from input but that is all. he told me to use whiles and fors but i cant seem to grasp the logic so now I am asking you for my help.
I will post here his requirements for the script and also the code for the script that i wrote hoping that somebody can help me.
I appreciate all the help and i will check later with you.
Thank you.
1. The problem statement, all variables and given/known data
Write a bash program to:
a) Input zero or more integers from standard input (one per line)
b) Input zero or more integers from command line arguments
c) Output the sum of all input numbers on standard output
It is not necessary to check for invalid input or to format the output.
2. Relevant commands, code, scripts, algorithms:
Free to use any of if statements, elif statements, while loops, for loops to achieve desired result.
3. The attempts at a solution (include all code and scripts):
Unfortunately script accepts only 5 numbers and the professor wants unlimited input.
if [ $# -lt 1 ]
then
echo Please enter you numbers \:
read num1
read num2
read num3
read num4
read num5
sum=$(( $num1 + $num2 + $num3 + $num4 + $num5 ))
echo The total is $sum
elif [ $# -le 5 ]
then
read num1
read num2
read num3
read num4
read num5
sum=$(( $num1 + $num2 + $num3 + $num4 + $num5 ))
echo The grand total is $(( $sum + $1 + $2 + $3 + $4 + $5 ))
fi
4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Diablo Valley College, PleasatHill, Ca, Stuart Fogg, Comsc117 I cant add URL if I don't have 5 posts, sorry.
Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
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LEARN ABOUT PHP
runkit_method_add
RUNKIT_METHOD_ADD(3) 1 RUNKIT_METHOD_ADD(3)
runkit_method_add - Dynamically adds a new method to a given class
SYNOPSIS
bool runkit_method_add (string $classname, string $methodname, string $args, string $code, [int $flags = RUNKIT_ACC_PUBLIC])
DESCRIPTION
Warning
This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in
a future release of PHP. This function should be used at your own risk.
PARAMETERS
o $classname
- The class to which this method will be added
o $methodname
- The name of the method to add
o $args
- Comma-delimited list of arguments for the newly-created method
o $code
- The code to be evaluated when $methodname is called
o $flags
- The type of method to create, can be RUNKIT_ACC_PUBLIC, RUNKIT_ACC_PROTECTED or RUNKIT_ACC_PRIVATE
Note
This parameter is only used as of PHP 5, because, prior to this, all methods were public.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
runkit_method_add(3) example
<?php
class Example {
function foo() {
echo "foo!
";
}
}
// create an Example object
$e = new Example();
// Add a new public method
runkit_method_add(
'Example',
'add',
'$num1, $num2',
'return $num1 + $num2;',
RUNKIT_ACC_PUBLIC
);
// add 12 + 4
echo $e->add(12, 4);
?>
The above example will output:
16
SEE ALSO
runkit_method_copy(3), runkit_method_redefine(3), runkit_method_remove(3), runkit_method_rename(3), runkit_function_add(3).
PHP Documentation Group RUNKIT_METHOD_ADD(3)