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Friday, May 2, 2014

Add digits of number in c

C program to add digits of a number: Here we are using modulus operator(%) to extract individual digits of number and adding them.

C programming code
#include <stdio.h>
#include<conio.h>
void main()
{
   int n, sum = 0, remainder;
   printf("Enter an integer\n");
   scanf("%d",&n);
   while(n != 0)
   {
      remainder = n % 10;
      sum = sum + remainder;
      n = n / 10;
   }
  printf("Sum of digits of entered number = %d\n",sum);
  getch();
}

For example if the input is 98, sum(variable) is 0 initially

98%10 = 8 (% is modulus operator which gives us remainder when 98 is divided by 10).
sum = sum + remainder
so sum = 8 now.
98/10 = 9 because in c whenever we divide integer by another integer we get an integer.
9%10 = 9
sum = 8(previous value) + 9
sum = 17
9/10 = 0.
So finally n = 0, loop ends we get the required sum. 


Add digits using recursion

#include <stdio.h>
#include<conio.h>
int add_digits(int);
void main() 
{
  int n, result;
  scanf("%d", &n);
  result = add_digits(n);
  printf("%d\n", result);
  getch();
}
 int add_digits(int n)  
{
  static int sum = 0;
   if (n == 0) {
   return 0;
  }
  sum = n%10 + add_digits(n/10);
  return sum;
}


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