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//  Problem 1068//  main.cpp//  ru.timus////  Created by Xibrand on 03.10.11. int a,b,c,d; d = b*b-4*a*c; cin>>a>>b>>c; if(a==0 && b==0 && c==0) cout<<""; if(a==0 && b==0 && c!=0) cout<<""; if(a==0 && b!=0) cout<<""; if(a!=0){ if(d == 0) cout<<""; if(d < 0) cout<<""; if(d > 0) cout<<""; }   int a,count; cin>>a; count = 0; if(a==0){ cout<<1; return 0; } while (a!=0) { count++; a/=10; }     cout<<count<<"\n";  int a,b,sum; sum=0; cin>>a>>b; while(a<=b){ sum+=a; a++; } cout<<sum<<"\n";  int i,n,count; i=2;count=0;cin>>n; while (i<=n) { count++; i+=2; } cout<<count;  for (int i=2; i<=10000; i++) { if (i%3==0) { cout<<i<<" "; } }// Домашнее задание// 1. Посчитать сумму цифр введенного числа#include<iostream>using std::cin;using std::cout;int main(int argc, const char * argv[]){    int a,sum;    cin>>a;    sum = 0;    while (a!=0)    {        sum += a%10;        a /= 10;    }    cout<<sum<<"\n";    return 0;}// 2. Напечатать "Yes",если введеное число простое#include<iostream>using std::cin;using std::cout;int main(int argc, const char * argv[]){    int n;    cin>>n;    if(n==1){        cout<<"No\n";        return 0;    }    if(n==2 or n==3 or n==5){        cout<<"Yes\n";        return 0;    }else{        if(n%2==0 or n%3==0 or n%5==0)            cout<<"No\n";        else            cout<<"Yes\n";            return 0;    }}// 3. Посчитать n!#include<iostream>using std::cin;using std::cout;int main(int argc, const char * argv[]){    int n,m;    m=1;    cin>>n;    for (int i=1;i<=n;i++){        m*=i;    }    cout<<m<<"\n";    return 0;}// 4. Посчитать a^b #include<iostream>using std::cin;using std::cout;int main(int argc, const char * argv[]){    int a,b,c;    cin>>a>>b;    c=a;    do{        a*=c;        b--;    }    while (b!=1);    cout<<a<<"\n";    return 0;}