Answer Posted / sanjay m

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

}
}
if(c<10)
printf("%d",c);
else
printf("%d",S);
getch();
}

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