関連ワード:  what is the role of return 0 in c    what is the purpose of return 0 in c    what is the purpose of return 0 in c++ program    what is the function of return 0 in c programming    what is the function of return 0 in c++    what is the significance of return 0 in c    what is the use of return 0 in c    what is the use of return 0 in c programming    what is the meaning of return 0 in c    what is the point of return 0 in c++