Adding Digits in a number to reduce it to Single digit

This is a C program for recursively adding a number until it becomes a single digit.

This is a part of Mumbai University MCA College C program MCA Sem 1

Adding and Reducing number to Single Digit

#include<stdio.h>
#include<conio.h>
void main()
{
int n,sum=10,n1;
clrscr();
printf("Enter a number :-");
scanf("%d",&n);
while(sum>=10)
{
sum=0;
while(n!=0)
{
n1=n%10;
sum=sum+n1;
n=n/10;
}
n=sum;
}
printf("Sum of digits :- %d ",sum);
}

Intput :

Enter a number :- 179

Output :

Sum of digits :- 8

Flow Chart 

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