Question: What is the total number of software whose programming language is C++ and operating system is Microsoft Windows?
SPARQL:
 SELECT DISTINCT COUNT(?uri) WHERE {?uri <http://dbpedia.org/ontology/programmingLanguage> <http://dbpedia.org/resource/C++> . ?uri <http://dbpedia.org/ontology/operatingSystem> <http://dbpedia.org/resource/Microsoft_Windows> }