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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

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...

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...

Try this...

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