Suggest a Best program that can be Developed by C or C++

Question

C++ Best Program that can be Developed by C or C++ as per your Idea. Suggest your Idea to me.. And let me think how creative you are.. Or just name your fav program in c++
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Answer 1

Compilers for all those other languages out there....

Many enthusiasts of languages other than C/C++ are often quick to criticize C/C++, conveniently forgetting that the compilers of their own favourite language is in fact written in C/C++!