Question

write a c program to perform sum of digits until you get a single digit ( for two inputs) in c​

Answer 1

Answer:

If n < 10

digSum(n) = n

Else

digSum(n) = Sum(digSum(n))

example:Input : 1234

Output : 1

Explanation : The sum of 1+2+3+4 = 10,

digSum(x) == 10

Hence ans will be 1+0 = 1

Input : 5674

Output : 4