// One-star problem
// Problem 11332 Summing Digits
/*
This program is written by
Prof. Chua-Huang Huang
Department of Information Engineering and Computer Science
Feng Chia University
Taichung, Taiwan
Disclaimer:
The programming problem is downloaded from UVa Online Judge (https://uva.onlinejudge.org/).
The program solution is provided for helping students to prepare Collegiate Programming
Examination (CPE). The author does not guarantee the program is completely correct to pass
UVa Online Judge platform or CPE examination platform.
This program is not intended for a student to copy only. He/She should practice the
programming problem himself/herself. Only use the program solution as a reference.
The author is not responsible if the program causes any damage of your computer or
personal properties.
No commercial use of this program is allowed without the author's written permission.
*/
#include
#include
int main(void) {
int n; // Input integer n.
int digit_sum;
scanf("%d", &n); // Input an integer n.
while (n>0) { // Continue when n is a positive integer.
digit_sum = 0; // Clear the digit sum.
while (n>=10) { // When there are more digits remaind.
digit_sum += n % 10;
n = n / 10;
if (n<10) {
n = n + digit_sum; // Reset n to be sum of all digits.
digit_sum = 0; // Clear the digit sum.
};
}
printf("%d\n", n); // Output g(n).
scanf("%d", &n); // Input the next integer.
}
return 0;
}