(i) at the beginning of the program there should be header-file/files under which the whole program will be executed. (ii) there should be void-main or main below the header-files. (iii) printf & scanf should be written in small letter. (iv) each statement must be ended by a semicolon ( . (v) each statement should be written in a single line. (vi) clrscr() must be used at the beginning, it runs under #include. (vii) getch() mast be used at the end. (viii) brackets, semicolons etc. should be given properly. (ix) the errors should also be checked. (x) the whole program should be compiled before running.