C Vernet(Valence)

long short and const First character must be a letter or underscore An identifier can be arbitrary long • Some C compilers recognize only the first few characters of the name (16 or 31) Case sensitive • ‘area’ ‘AREA’ and ‘Area’ are all different stud_name Empl_1 Empl_2 avg_empl_salary C = A + B PRINT C STOP } scanf(“ d d”&a &b);

The C language includes a set of preprocessor directives which are used for things such as macro text replacement conditional compilation and file inclusion Although normally described in a C language manual the GNU C preprocessor has been thoroughly documented in The C Preprocessor a separate manual which covers preprocessing for C