TCS Coding Practice Question | Sum of Digits of a number

Given a number, the task is to find the Sum of Digits of this number using Command Line Arguments. 

Examples:

Input: num = 687
Output: 21

Input: num = 12
Output: 3

Approach:

• Since the number is entered as Command line Argument, there is no need for a dedicated input line
• Extract the input number from the command line argument
• This extracted number will be in string type.
• Convert this number into integer type and store it in a variable, say num
• Declare a variable to store the sum and set it to 0
• Repeat the next two steps till the number is not 0
• Get the rightmost digit of the number with help of remainder '%' operator by dividing it with 10 and add it to sum.
• Divide the number by 10 with help of '/' operator
• Print or return the sum

Program: 

Output:

• In C: 👁 Image
  
• In Java: 👁 Image
  
• In Python 

👁 Image

Time complexity: O(logn)

Auxiliary Space: O(1)