Some macros

#define SQR(x) ((x)*(x))

#define MAX(a,b) ( (a) > (b) ? (a) : (b)  )

#define ISLP(y)  (  (y % 400 == 0)  || (y %100 != 0 && y%4 == 0)  )

 #define ISLOWER(a)  (a>=97 && a<=127)

#define TOLOWER(a)  (a - 32)

See also

• For a Given node of a binary tree, print the K distance nodes.
• Find the distance between 2 nodes in Binary Tree
• Find the distance between 2 nodes in Binary Tree
• Program to count leaf nodes in a binary tree
• Friend Circle - Hackerrank