C: Macro Definition

When you use a macro, enclose each parameter in parentheses and enclose the overall definition of the macro; In general, do not use the self-increment or decrement operator in a macro.

[1] Maximum value

#define MIN (x, Y) (((x) < (y))? (x): (y))

Ask the lesser of the two

#define MAX (x, y) ((x) > (y))? (x): (y))

Ask the larger of the two

#define MAX3 (X,Y,Z) max (Max (x,y), z)

The larger among the three

[2] Shift

#define SHIFT (value, N) (((n) > 0)? ((value) << (n))

: ((value) >>-(n))

Shift operation on value, n > 0 left SHIFT, N < 0 right Shift

[3] Character

#define IS_LOWER_CASE (x) ((x) >= ' a ') && ((x) <= ' z '))

Judge Lowercase

#define IS_UPPER_CASE (x) ((x) >= ' A ') && ((x) <= ' Z '))

Judge Uppercase

#define Is_alphabetic (c) (Is_lower_case (c) | | Is_upper_case (c))

Judging letters

#define IS_DIGIT (x) (((x) >= ' 0 ') && ((x) <= ' 9 '))

Judging numbers

#define Is_special (c) (!is_digit (c) &&!is_alphabetic (c))

Judging special characters

[4] Take absolute value

#define ABSOLUTE_VALUE (x) ((x) < 0)?-(x): (x))

[5] #运算符

#define DPRINT (expr) printf (#expr "=%.1fn", expr)

#参数: Will output the quoted parameter value;

Dprint (1.0/2.0); will output: 1.0/2.0=0.5;

[6]# #运算符

#define XPRINT (Front,back) Front # back

XPRINT (x,1); will output: x1

[7] Judging leap years

#define LEAP_YEAR (x) ((x)% 4 = 0 && (x)% 100!= 0) | | ((x)% 400 = 0))

[8] integer val takes bit of nth bit

#define BIT (Val,n) (((VAL) >> (N)) & 1? 1:0)

This article is from the "Zi Postman" blog, please be sure to keep this source http://zhangjunhd.blog.51cto.com/113473/54402