#include <iostream>
#include <stdio.h>
class FOR {
    private:
        int k = 0;
        int j = 0;
        int i = 0;
    public:
        FOR(int J,const char* H){
            this->j = J;
        };
        int get(){
            this->i = this->k;
            return this->i;
        };
        bool loop(){
            if (this->k < this->j) {
                (this->k)++;
                return true;
            } else {
                return false;
            }
            
            
        };
};
int main() {
    FOR g(10,"^_^");
    while (g.loop()) {
        printf("%d:",g.get());
        std::cout << "Hello world!" << std::endl;
    }
    
    return 0;
}