a single digit */
#include <stdio.h>
int main()
{
long number;
int sum=0;
int digit;
printf("Enter the number\n");
scanf("%ld",&number);
while(number>0)
{
sum=0;
while(number>0)
{
digit=number%10;
number=number/10;
sum=sum+digit;
}
if(sum>9)
{
number=sum;
}
}
printf("The sum is %d",sum);
return 0;
}
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