C language writing specification

• C Language is case sensitive ;
• Many programmers will follow the specification of using only lowercase letters in identifiers （ Except macro naming ). In order to make the name clear , Underline will also be inserted if necessary :  symbol_table current_page name_and_address
• Other programmers avoid underscores , Their method is to start each word in the identifier with a capital letter :
  symbolTable currentPage nameAndAddress( The first letter is sometimes capitalized .)
• The former style is traditional C Very common in , But now the latter style is more popular , As long as you ensure that the same identifier is used in the same way in the whole program .C There is no limit on the maximum length of identifiers .
• exit(0) or return o Appear in the main Time in function , The two statements are completely equivalent : Both terminate program execution , And return to the operating system 0 value .
• In giving float Type variables need to be assigned with letters f. If not f, The compiler may generate a warning message , Tell you to store in float The number in the type variable may exceed the value range of the variable .