There is always something you don't know in C Language -- (continuous update)

There is always something you don't know in C Language -- (continuous update)

/* Although I have learned C language, I still haven't met some things that I don't know: */# include

 
  
# Define NUMBER 5/* define: the variable names after the macro definition are automatically replaced with strings during capital compilation, that is, the NUMBER in the file is replaced with 5 typedef to an alias for the existing data type, such as typedef int int_wy ---> SO int_wy it indicates the int type */int array [NUMBER]; int main () {int I = 9; // puts is generally used to display puts ("used? "); //" Used? "+ I --> try puts again (" used? "" Is that true? "); Printf (" He can make a sound: \ a \ n "); putchar ('\ n'); extern int array []; /* This is actually useless because the array has been declared before. Here it is not to define the array extern, which indicates to try the array created somewhere * // * The static defined object is static storage. period, the preparation phase is created before the main execution, and the program disappears at the end */return 0 ;}