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Sum even numbers from 1 to 100


 
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# 1  
Sum even numbers from 1 to 100

I need help with this assignment. I'm very new to using UNIX/LINUX, and my only previous experience with programing anything is using python.

We are writing scripts using vim, and this one I'm stumped on.

"Write a shell script that finds and display the sum of even positive integers from 0 to 100. Use the while control structure. Show your script and a sample run.

Example: Sum of 0+2+4+6+8+10+12+14............+96+98+100. "

I can find examples of listing even and odd numbers, but everything else I seem to find is adding numbers from an input from the user, but I want to add the numbers together from a range of {1..100}.
Any help would be greatly appreciated.

Last edited by RudiC; 02-28-2019 at 10:21 AM..
# 2  
Quote:
Originally Posted by Nastybutler
...
I can find examples of listing even and odd numbers, but everything else I seem to find is adding numbers from an input from the user, but I want to add the numbers together from a range of {1..100}.
Any help would be greatly appreciated.
It would be nice to see what you have so far!
# 3  
I have erased and restarted so many times out of frustration what I have I know is nowhere close to what I'm looking for.

Code:
i=1
sum=0

for n in {1..100}
do
        out$=(( $n % 2))
        while [ $out -eq 0]
        do
        sum=$((sum + $n))
        i=$((i + 1))
done


So the idea is I'm taking the numbers from this list: {0..100}

and I only want the ones that are even:
Code:
(( $n % 2))

Take those even numbers and print out them all out, adding them together like:
"2+4+6+8.....+98+100"


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 02-28-2019 at 10:23 AM.. Reason: Added CODE tags.
# 4  
There is a third argument to the for statement, and that is the step.
The for statement provides for incrementing "n"
# 5  
Please wrap your code in code tags!
If you replace the while-do-done with an if-then-fi it makes sense: "if the remainder is zero then sum up"
Code:
...
  if [ $out -eq 0]
  then
    sum=$((sum + $n))
    i=$((i + 1))
  fi
...

# 6  
Do not post homework / classworkquestions in the open fora. We have a special forum for those. Please fill in the entire form.


I guess - as this is an exercise for writing while loops - you can't adapt the Gaussian Sum Formula ( n(n+1)/2 )?

Last edited by RudiC; 02-28-2019 at 10:25 AM..

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