How Do I Get The O/P In Single Digit?

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#include<stdio.h>
int dob(int num);
main()
{
        int num,c;
        printf("enter the number ");
        scanf("%d",&num);
        printf("the sum of the digits is %d",dob(num));
        return 0;
}
int dob(int num)
{
        int temp=0,c;
        if(num>10)
        {
                temp=num%10;
                num=num/10;
                return temp+(dob(num));
        }
}

Posted 21-Nov-14 1:10am

naralasaimanoj

Updated 21-Nov-14 1:58am

den2k88

v4

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den2k88 21-Nov-14 8:00am

I'm sorry but can you tell us something more? The question is poorly worded - what do you mean with "How Do I Get The O/P In Single Digit"?

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Fredrik Bornander · Answer 1 · 2014-11-21T02:12:00

Are you trying to calculate the sum of the digits in num recursively?
If that is the case, something like this might work for you;

C

#include<stdio.h>

int dob(int num);
int calc(int num);

int main() {
    int num, c;
    printf("enter the number ");
    scanf("%d", &num);
    printf("the sum of the digits is %d", calc(num));
    return 0;
}

int calc(int num) {
    int sum = num;
    do {
        sum = dob(sum);
    } while (sum > 9);
    return sum;
}

int dob(int num) {
    if (num < 10)
        return num;
    else
        return dob(num / 10) + dob(num % 10);
}

Hope this helps,
Fredrik