How can we sum the digits of a given number in single statement?

int sum=0;

  for(;num>0;sum+=num%10,num/=10);  // This is the “single line”.

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