The Biggest Water Proble
The Biggest Water Problem
https://www.nowcoder.com/practice/435aa556e093463891f6da7d322140a4?tpId=290&tqId=39938&sourceUrl=https%3A%2F%2Fwww.nowcoder.com%2Fexam%2Foj%3Ftab%3D%25E8%25AF%25AD%25E6%25B3%2595%25E7%25AF%2587%26topicId%3D290
#include <stdio.h>
int main() {
int num = 0;
scanf("%d", &num);
while (num >= 10)
{
int sum = 0;
while (num)
{
// 将num的每一位上的数字进行相加
sum += (num % 10);
num /= 10;
}
num = sum;
}
printf("%d", num);
return 0;
}