関連ワード:  uses of function in c programming    purpose of function in c programming    what is the use of main function in c programming    what is the use of printf function in c programming    what is the use of scanf () function in c programming    define the use of function in c programming with example    use of getchar () function in c language    what is the use of main function in c language    what is the use of getch function in c language    what is the use of printf function in c language