Answer Posted / suvabrata das

#include<stdio.h>
#include<conio.h>
void main()
{
int n,c=0,r,i;
clrscr();
printf("enter no.");
scanf("%d",&n);
while(n>0)
{
{
r=n%10;
c=c+r;
n=n/10;
}
if(c>9)
{
n=c;
c=0;
}
}
printf("%d",c);
getch();
}

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