i) before learning and executing programming in C. ii) we have to use 'header file' to run the programme iii) use are to use some 'user defined' function iv) We have to use 'clrscr()' to crear the previous history v) in evry sentence at last we have to use semi colon ( vi) there are some variables in programming C i.e 'int' vii) there are some data types also in C viii) to stay in the screen we use 'getch()' ix) the main programme should be kept in second bracket {} x) we have practice more and more to learn it