## INDEX

### FIND SUM OF DIGITS OF A NUMBER USING RECURSION USING C PROGRAM

Sum of digits in c using recursion

#include<stdio.h>
int main(){
int num,x;
clrscr();
printf("\nEnter a number: ");
scanf("%d",&num);
x=findsum(num);
printf("Sum of the digits of %d is: %d",num,x);
return 0;
}

int r,s;
int findsum(int n){
if(n){
r=n%10;
s=s+r;
findsum(n/10);
}
else
return s;
}

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1. write a program to add the following
¼+2/4+3/4+5/3+6/3+………

2. You should declare function int findsum(int) and line 18 (else) shouldn't be included, because the output is incorrect...here is the right source code:

#include
int findsum(int);
int main(){
int num,x;

printf("\nEnter a number: ");
scanf("%d",&num);
x=findsum(num);
printf("Sum of the digits of %d is: %d",num, x);
return 0;
}

int r, s;
int findsum(int n){

if(n){
r=n%10;
s=s+r;
findsum(n/10);
}
return s;
}

3. s should be initialized with 0

1. No need as it is global so already initialized with 0.

4. This comment has been removed by the author.

5. initialize with zero

1. ya u r right...

2. its global variable
its initialize with 0 by default

6. The variable s treats as a external variable.the default value of s is automatically initialized to 0.

1. how will you find the sum of the digits of the resulting sum of digits if it is more than 10?

7. what's the meaning of if (n) ??

8. int sum = 0;
if (num < 10)
return num;
else
{
sum = num % 10;
num = num / 10;
num = num + sum;