Wanted: way to look for file names without certain suffixes

[Larry W. Virden ext. 2487]

I am trying to figure out a way to find all files which do have, for
instance, a .c but do not have a .o.  I can do something like:

#! /bin/ksh

lst=$(ls *.c)
for i in $lst ; do
        if [ ! -f ${i%%.c}.o ] ; then
                echo $i
        fi
done

but I was wondering if I am missing something easier?
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