C program to Count the digits of a number

C Program for Sum the digits of a given number

Last Updated : 04 Aug, 2022

Given a number, find sum of its digits.
Example :

Input : n = 687
Output : 21

Input : n = 12
Output : 3

1. Iterative:

C

// C program to compute sum of digits in  
// number. 
# include<stdio.h> 
  
/* Function to get sum of digits */
int getSum(int n) 
{  
   int sum = 0; 
   while (n != 0) 
   { 
       sum = sum + n % 10; 
       n = n/10; 
   } 
   return sum; 
} 
  
int main() 
{ 
  int n = 687; 
  printf(" %d ", getSum(n)); 
  return 0; 
} 

Time Complexity: O(log₁₀n)

Auxiliary Space: O(1)

How to compute in single line?

c

# include<stdio.h> 
/* Function to get sum of digits */
int getSum(int n) 
{ 
    int sum; 
  
    /* Single line that calculates sum */
    for (sum=0; n > 0; sum+=n%10,n/=10); 
  
    return sum; 
} 
  
int main() 
{ 
  int n = 687; 
  printf(" %d ", getSum(n)); 
  return 0; 
} 

2. Recursive

c

int sumDigits(int no) 
{ 
   return no == 0 ? 0 : no%10 + sumDigits(no/10) ; 
} 
  
int main(void) 
{ 
    printf("%d", sumDigits(687)); 
    return 0; 
} 

Please refer complete article on Program for Sum the digits of a given number for more details!

C program to Count the digits of a number

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