write a java script code to accept a number and write a function to calculate sum of digits of that number

Answer 1

Use modulo by 10 to get the last digit of a number, add it to a sum variable, then integer division by 10 to chop that number off the end. For example:

579 % 10 = 9

579 / 10 = 57

57 % 10 = 7

57 / 10 = 5

5 % 10 = 5

5 / 10 = 0

The above operations can be performed in a while loop that iterates until your number becomes 0.