How to find out if a machine is 32 bit or 64 bit?

n = sizeof(void *);

if n==8, than 64 bit 
if n==4, than 32 bit.

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