Give a fast way to multiply a number by 7

Multiply by 8 (left shift by 3 bits) and then subtract the number.

(x << 3) - x

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