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Try this script:
awk '
BEGIN{A[1]="in exit.c"; A[2]="dl-fini.c"; A[3]="in genops.c"}

{for(i in A)if($0~A[i])B[i]++}

END{for(i in A){print B[i]"\t"A[i]}}' gdb_output

Try this...

awk -F: '{x=$0;gsub(",",".");y=$3-$2;gsub("\\.",",",y); print x OFS y }' OFS=: infile
--ahamed

If you want (slash need) to stick to sed and bc, try this:

sed 's/^\(.*:\)\([0-9]*\),*\([0-9]*\):\([0-9]*\),\([0-9]*\)/print \"\1\2,\3:\4,\5:\",\4\.\5-\2\.\3,\"\n\"/' beurs.txt|bc|sed...

To be honest, I've hardly ever worked with bc before. I just took a glimpse at the man page and came up with this idea. Since we are mixing strings and expressions, the print command seemed the way...