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My original code has an error with the for loop

Yes I posted the whole problem before and you gave me an answer but i want to use my own code. I dont want to use someone elses code, I am just having trouble figuring out the problem with the...

What am I doing wrong with this foreach loop?

foreach var ($argv)
@sum = $sum + $var

#!/bin/csh
# This program will add integers
#
#
# add integer1 ..
#

# Check for argument
if ($#argv == 0 ) then
echo "usage: add integers"
exit 1
else
set input = $argv ...