C Program for Sum the digits of a given number

Given a number, find sum of its digits.

Example :

Input : n = 687
Output : 21

Input : n = 12
Output : 3

1. Iterative:

C

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// 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;
}

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How to compute in single line?

C

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# 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;
}

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2. Recursive

C

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

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



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