# include<iostream> using namespace std; int main(){ int a; cin>>a; int ge,shi,bai; ge=a%10; //个位：对10取余数就得出 shi=a/10%10;//十位：降位再取余数123/10=12,12%10=2; bai=a/100; cout<<ge+shi+bai<<endl; return 0; }